The genes located on the q arm of chromosome 17 are blmh, slc6a4, krtha1, gastrin, gh1, dcp1, and mpo. Therefore, the correct option is MPO and glut4.
What is chromosome 17?
Chromosome 17 is one of the 23 pairs of chromosomes in humans. The genes located on chromosome 17 provide instructions for making proteins involved in various critical cellular activities.
Chromosome 17 contains over 1,200 genes that provide instructions for creating proteins involved in critical cellular activities.
The genes located on the short arm of chromosome 17 include rp13, tp53, and glut4. On the long arm, there are blmh, slc6a4, krtha1, gastrin, gh1, dcp1, and mpo.
MPO and glut4 are both genes located on chromosome 17's long q arm.
MPO is a protein-coding gene that codes for myeloperoxidase, an enzyme that participates in the host defense system of neutrophils by generating reactive oxidants.
It is involved in preventing infections and chronic inflammation.
GLUT4 is a protein-coding gene that codes for glucose transporter 4, a membrane-spanning protein that transports glucose into the cell from the bloodstream.
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What is the relationship between changing CO2 emissions and CO2 concentration?
Answer: When the carbon dioxide concentration goes up, temperature goes up. When the carbon dioxide concentration goes down, temperature goes down.
Explanation:
Ribosomes are only found on the endoplasmic reticulum.
True
False
Answer:
False
Explanation:
just took test
A skeletal muscle deprived of adequate ATP supplies will .
A) immediately relax
B) enter a state where actin and myosin are unable to separate
C) fire many more action potentials than usual and enter a state of "rigor"
D) sequester all free calcium ions into the sarcoplasmic reticulum
Option A is correct. Skeletal muscle is one of the three good sized muscle tissues in the human body.
Each skeletal muscle consists of hundreds of muscle fibers wrapped together through connective tissue sheaths. The person bundles of muscle fibers in a skeletal muscle are known as fasciculi.
What is the skeletal muscle function?The skeletal muscular tissues are responsible for body actions such as typing, breathing, extending the arm, writing, etc. The muscle mass contract which pulls the tendons on the bones and causes movement. The physique posture is maintained via the skeletal muscles. The gluteal muscle is accountable for the erect posture of the body.
What are the 3 kinds of skeletal muscle?In the body, there are three kinds of muscle: skeletal (striated), smooth, and cardiac.
Skeletal Muscle. Skeletal muscle, connected to bones, is responsible for skeletal movements. ... Smooth Muscle. ... Cardiac Muscle.
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https://brainly.com/question/1283837#SPJ4Emphysema is a disease that damages alveoli describe how this disease would affect a persons ability to breathe then explain how emphysema would affect the concentration of oxygen and carbon dioxide in the bloodstream
Answer:
Emphysema is one of the lung disorders caused by damage to the air sacs in the lungs, which reduces the body's ability to take advantage of oxygen from the air. This results in inefficient breathing, because it takes extra effort to empty the air from the lungs. This disease progressively destroys the fibers that allow the airways to remain open. This problem causes the collapse of these pathways when a person exhales air. That is, the air that the lungs expel that contains carbon dioxide cannot get out, and consequently, the fresh, oxygen-filled air does not enter the lungs.
Explanation:
When we breathe, the air comes through the bronchial tree to a kind of small sacs called alveoli, which are located at the end of the bronchi and fill the lungs. From the lungs, oxygen is transported, through the arteries, to the different tissues and organs of the body. But, generally due to smoking, people with emphysema have damaged alveoli: the inner walls of these sacs weaken and break, which creates larger air spaces and therefore reduces the air exchange surface of the cells lungs. Consequently, the amount of oxygen that reaches the blood decreases and this can produce in the patient a sensation of shortness of breath, which is the frequent characteristic manifestation of this respiratory pathology. In the pulmonary alveoli, the oxygen in the air is exchanged for carbon dioxide in the blood. The walls of the air sacs are thin and fragile, so the injuries that occur in these air sacs are irreversible. Emphysema causes the alveoli - the small air sacs in the lungs that provide oxygen to the bloodstream - to weaken and they become less elastic. That means the body has difficulty getting enough oxygen or has excess carbon dioxide in the body.
Answer:
My answer is down below. Don't directly copy because you will get plagiarism, and that's not what I want to happen to you. The only reason why I posted my answer is if you are in need of some help to think of things to write. Hope you enjoy it!
Explanation:
One of the sad things about this disease is that we currently do not have a cure for it. Which is very unfortunate for the people that end up getting it. There is some hope of relieving some pain, but there isn't a 100% cure. What emphysema does is it destroys the walls between your alveoli. What happens to your lungs? Well, it makes the lungs less able to absorb oxygen into our bloodstream and also remove carbon dioxide from our blood. The good news/bad news is that if you are diagnosed with emphysema you are likely to still live anywhere from 1-5 more years, which is pretty amazing that our body can last that long with damaged lungs.
what is the difference between the hydrogen bonds holding the nitrogenous bases together in the DNA structure ?
Answer:
Explanation:
Chemical structures of the five nitrogenous bases are shown below. ... Adenine and guanine are purine bases found in both DNA and RNA. ... Nucleosides have slightly different names than their nitrogenous base parents, and depend upon
Eukaryotic DNA is bound to proteins known as histones to form structures called nucleosomes. During initiation, the DNA is made accessible to the proteins and enzymes involved in the replication process. There are specific chromosomal locations called origins of replication where replication begins. In some eukaryotes, like yeast, these locations are defined by having a specific sequence of basepairs to which the replication initiation proteins bind. In other eukaryotes, like humans, there does not appear to be a consensus sequence for their origins of replication. Instead, the replication initiation proteins might identify and bind to specific modifications to the nucleosomes in the origin region.
Eukaryotic DNA, organized into structures called nucleosomes, is bound to proteins known as histones. These nucleosomes play a crucial role in the replication process by making the DNA accessible to proteins and enzymes involved in replication
This helps to compact the long strands of DNA, allowing it to fit inside the nucleus of the cell. During the initiation of DNA replication, the DNA needs to be made accessible to the proteins and enzymes involved in the process. This is achieved through a series of events that involves the loosening of the nucleosomes, allowing the DNA to be exposed.
In some eukaryotes, such as yeast, the origins of replication are defined by a specific sequence of base pairs to which the replication initiation proteins bind. However, in other eukaryotes, including humans, there does not appear to be a consensus sequence for their origins of replication. Instead, the replication initiation proteins may recognize and bind to specific modifications to the nucleosomes in the origin region. These modifications could include changes to the chemical structure of the histones or the addition of other proteins that alter the way the nucleosomes interact with the DNA.
Despite the lack of a defined sequence for origins of replication in some eukaryotes, the replication process is still tightly regulated and controlled. This ensures that DNA is faithfully replicated each time a cell divides, maintaining the genetic integrity of the organism.
In some eukaryotes, such as yeast, the origins of replication have a specific sequence of base pairs that allows replication initiation proteins to bind. However, in other eukaryotes like humans, there is no consensus sequence for the origins of replication. Instead, replication initiation proteins may identify and bind to specific modifications of nucleosomes in the origin region.
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HELPPPPPPPPPPPPPPPPPPP
Answers:
5. Describe how light microscopes are used to magnify objects:
When light reflects off of an object being viewed under the microscope and passes through the lens, it bends towards the eye. This makes the object look bigger than it actually is.
What are limitations of using a light microscope?Limitation: Low Resolution. Because optical microscopes use normal white light, the limit of their resolution is 200 nanometres. This means that objects smaller than this cannot be properly viewed by an optical microscope.
6.What is the advantage of using electron microscopes?
Advantages would be of course magnification and higher resolution
as electrons rather than light waves are used, it can be used to analyze structures which cannot otherwise be seen. The resolution of electron microscopy images is in the range of up to 0.2 nm, which is 1000x more detailed than light microscopy.
7.Contrast TRANSMISSION ELECTRON MICROSCOPES (TEM)with SCANNING ELECTRON MICROSCOPES(SEM):The main difference between SEM and TEM is that SEM creates an image by detecting reflected or knocked-off electrons, while TEM uses transmitted electrons (electrons that are passing through the sample) to create an image.
8. Answer:All cells share four common components: plasma membrane, cytoplasm, DNA, and ribosomes.
9. What is the defining characteristic of a prokaryotic cells?The defining characteristic of prokaryotes is that they lack a membrane-enclosed nucleus. The single chromosome, usually circular, is tightly wound and compact. The region of the cytoplasm containing the chromosome is called the nucleoid.
10.What is the defining characteristic of a eukaryotic cell?Eukaryotic cells are defined by the presence of a nucleus surrounded by a complex nuclear membrane.
Hope this helps^^Explanation:
Organisms that have only one chromosome of each type are called.
Explain the process of photosynthesis in a plant in detail.
Answer:
Photosynthesis is the process through which plants convert light energy from the sun to chemical energy. The chemical energy is then stored as sugar. During the process of photosynthesis, plants capture light energy and use it to convert water, carbon dioxide, and minerals into oxygen (released into the air) and glucose (stored in the plant and used as food).
Explanation:
The plant takes in carbon dioxide in the atmosphere through the stomata on its leaves. It is worth noting that there are some stomata on the stems as well.
Water gets into the plant mainly through the roots and finds its way to the leaves, where photosynthesis occurs. Plant roots are specially designed to draw water from the ground and transport it to the plant leaves through the stem.
Chlorophyll, the green coloring matter of the leaf, traps the energy from sunlight as it shines on the leaf. It is worth noting that it is chlorophyll that gives the leaf its green color.
The solar energy is used to break water down into hydrogen and oxygen. Then hydrogen is combined with carbon dioxide to make sugar, which is food for the plant. Oxygen is released as a byproduct through the stomata.
Answer:
The roots absorb water and nutrients. Water is carried to the leaf by the xylem in the stem. Carbon dioxide enters the leaf through the stomata. Energy from the sun is captured by chlorophyll in the chloroplasts. The process begins once these three reactants are present. Sunlight provides energy for a series of chemical reactions. Molecules break apart and join with other molecules to form glucose, which is a sugar or food for the plant, and oxygen, which is released into the air.
Explanation:
Sample Response on edge
which of these consumers might depend on plankton for its energy? krill orca rabbit seaweed PLEASE ANSWER ASAP
Answer:
Krill and orca are both consumers that depend on plankton for their energy. Krill are small, shrimp-like animals that are a major food source for many marine animals, including orcas. Orcas are large, apex predators that hunt in packs to catch krill and other small marine animals. Rabbits and seaweed are not consumers that depend on plankton for their energy. Rabbits are herbivores that eat plants, and seaweed is a plant that gets its energy from the sun.
Here is a table that shows the relationship between these consumers and plankton:
Consumer : Relationship to plankton
Krill: Plankton is a major food source
Orca: Plankton is a prey item
Rabbit: Plankton is not a food source
Seaweed: Plankton is not a food source
what do you think would happen if the AV node could no longer do it’s job? Explain how this would affect the contraction of the heart and movement of blood
Answer:who else is high rn
Explanation:
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is this an endothermic or exothermic reaction
Explanation:
An endothermic reaction is a chemical reaction that absorbs (or use) energy overall.
An exothermic reaction is a chemical reaction that releases energy by light or heat.
you have a liquid culture of bacteria. you perform 5 10-fold dilutions and plate 0.1 ml on an agar plate. after the colonies grow up, you count 37 colonies on the plate. what was the bacterial concentration in the original culture?
The original bacterial concentration in the liquid culture is 3.7 x 10^7 colonies/ml.
The original bacterial concentration in the liquid culture can be calculated from the number of colonies present on the agar plate. Since you performed five 10-fold dilutions, the original concentration can be determined by calculating the number of bacteria present after a single 10-fold dilution and multiplying this by 10^5 (10 raised to the power of 5).
The number of bacteria after a single 10-fold dilution can be determined using the equation c1V1 = c2V2, where c1 is the original concentration, V1 is the volume of the original culture, c2 is the concentration after the 10-fold dilution and V2 is the volume of the 10-fold dilution. In this case, V1 = 0.1 ml, V2 = 1 ml, and c2 is 37 colonies/ml.
Therefore, c1 = 370 colonies/ml. To calculate the original bacterial concentration in the liquid culture, you need to multiply 370 colonies/ml by 10^5. Therefore, the original bacterial concentration in the liquid culture is 3.7 x 10^7 colonies/ml.
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Need help asap. Picture below to see what I need help with
When a BB male and a Bb female are crossed, 50% BB and 50% Bb genotypes are produced and a 100% black phenotype.
The entire number of genes that an organism receives from its parents makes up its genotype. Alleles, which are pairs of these genes, are found. One gene is dominant and one gene is recessive in each allele.
The dominant gene is always expressed in a cross if it is present. Only when a pair of alleles is made up of two recessive genes does the recessive gene express itself. In this instance, the white fur is subordinate to the black fur. White fur is represented as b, while black fur is represented as B.
We can see that when we cross the BB male and Bb female, we will get a genotype that is 50% BB and 50% Bb, as well as a phenotype that is 100% black fur.
Parents: BB x Bb
Gametes: B, B, and B, b
Offspring: BB, BB, Bb, Bb
The genotypic ratio = 1:1
The phenotypic ratio = 1:0
Genotype probabilities:
P(BB) = 2/4 = 0.5 or 50%
P(Bb) = 2/4 = 0.5 or 50%
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Because DNA differs for individuals, adding a restriction enzyme to a sample can create multiple cuts that are
unique to each sample.
1) Examine the sequences below and indicate where the Smal enzyme cuts the DNA and how many
fragments are created
A T C A T C C C G G G A G A G C T A G C C C G G G A A A T A G G C C C G G GAT CATGA T T
T A G T A G G G C C CTCTC G A T C G G GCCCTТТАТСC GGGCC C T A G T A C T A A
How many fragments are created?
AA C
A T GAA CATC C C G G G A T C A A G G C A G G A A A C C C G G G AT A G T T A A C C
T I G
T A C T T G T A G G G C CCTAGTтссстостттссссс СТАТ С A A T T G G
How many fragments are created?
Answer:
For the first sequence, the Smal enzyme cuts at the following sites:
ATC|ATC
AGC|CCG
GGA|TAG
CCC|GGG
ATA|GGC
CCCGGG|ATC
ATTTAG|CTG
This creates 7 fragments.
For the second sequence, the Smal enzyme cuts at the following sites:
TGAAC|ATCC
CGGG|ATTAGT
TCCC|TAG
TAACTT|GTAGG
GCC|CTAGT
TTCAG|GCC
TTA|TTGG
This creates 7 fragments.
Match the following structures with the correct letter.
A
B
C
D
E
which of the following organisms has the simplest cellular structure? a. bacterium b. earthworm c. mushroom d. sunflower
Bacteria will have the simplest cellular structure. So the correct option is A.
What are prokaryotic cells?A cell type without a genuine nucleus or membrane-bound organelles is referred to as prokaryotic. All the other types of life are eukaryotic, whereas organisms in the categories of Bacteria and Archaea are centered on the prokaryotic cell.
Prokaryotic species, on the other hand, are exceedingly prevalent and account for a large portion of the biomass on Earth.
Unicellular organisms are those that have prokaryotic cells. We refer to them as "prokaryotes." A prokaryotic cell may operate as a live creature thanks to a number of factors. Prokaryotes have a cell membrane covering them at first.
With the help of this membrane, they may engineer a particular environment for metabolic processes within the cytosol. Second, these cells contain both ribosomes and free DNA.
Even though ribosomes are organelles, a plasma membrane does not enclose them.
Therefore the correct option is A.
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Defend the statement:
"all cells contain the same DNA, but are vastly different."
label each part of the typical human cell. mcgraw hill connect
The nucleus, cytoplasm, mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, cytoskeleton, and cell membrane are among the many components of a normal human cell, each of which has a particular purpose.
What are the human cell's five components?component cells. A membrane that has receptors on its surface encircles each cell. The Golgi complex, endoplasmic reticulum, mitochondria, and the nucleus are only a few of the numerous tiny structures found inside a cell.
What components make up a human cell?All cell types' characteristics are present. The cell membrane, nucleus, and cytoplasm are the three components that make up a cell. The cytoplasm contains hundreds or perhaps thousands of small, distinct structures known as organelles and intricate arrangements of microscopic fibres.
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Layers of closely packed cells that are found covering or lining body surfaces, as in the ____________ of the skin, are called ____________ tissue.
Layers of closely packed cells that are found covering or lining body surfaces, as in the __Epidermis_ of the skin, are called _Epithelium__ tissue.
What is the epithelium?
Epitheliums are the cell layers that cover the body, different organs, bones, and other structures.
Epitheliums have their own shape, characteristics, and internal composition that make them unique and allow them to accomplish their functions. Their morphology correlates with their function.
There are two main types of epitheliums according to the number of cell layers,
• Simple epithelium
• Stratified epithelium
⇒ Simple epitheliums intervene in secretion or absorption processes.
Cells' height frequently reflects their secretor or absorptive activity degree.
Epitheliums that transport substances are characterized by presenting cubic or columnar cells.
⇒ The stratified epithelium is composed of several layers. The shape and size of the cells vary from one layer to the other.
Its general function is to provide a protective barrier in areas that are more exposed, and a certain degree of waterproofing.
Stratification correlates with transepithelial impermeability and friction exposure.
It protects against humidity loss and mechanical erosion.
The skin epidermis is a common example of stratified epithelium. It is composed of five cell layers, which have different functions:
Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
Epitheliums also share many characteristics.
• They form cohesive layers, with cells very close to each other
• Scarse extracellular matrix
• Many union complexes join the cells
Cohesion between epithelial cells is possible by special adhesions that serve as anchoring of each cell's cytoskeleton and the extracellular matrix.
1) Epidermis
2) Epithelium
Layers of closely packed cells that are found covering or lining body surfaces, as in the __Epidermis_ of the skin, are called _Epithelium__ tissue.
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Select all that are functions of neurons and glial cells Receive nerve impulses Protect neurons Nourish neurons Calcium storage
roles of glial cells and neurons
taking in nerve impulsesDefend neuronsfeed the neuronsNeurons, which are specialized cells with the ability to receive and transmit electrical or chemical impulses, make up the nervous system. Glia, which are cells with complementary information processing roles to neurons, serve as support cells for the neurons.
Without the crucial functions performed by these glial cells, neurons would not be able to operate. In addition to providing myelin sheaths surrounding axons and buffering ions and chemicals that may otherwise injure neurons, glia also direct growing neurons to their destinations.
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Question:-
Select all that are functions of neurons and glial cells
Receive nerve impulses Protect neurons Nourish neurons Calcium storageif you performed a pcr experiment starting with only one copy of double-stranded dna, approximately how many dna molecules would be present in the reaction tube after 40 cycles of amplification? enter your answer as a whole number.
When performing a PCR experiment starting with only one copy of double-stranded DNA, approximately 1,099,511,627,776 DNA molecules would be present in the reaction tube after 40 cycles of amplification.
What is PCR?Polymerase chain reaction (PCR) is a technique used in molecular biology to amplify a single copy or a few copies of a DNA sequence, producing thousands to millions of copies of the sequence. It has become an important tool in molecular genetics, medical diagnostics, and biological research. This method requires a small amount of starting DNA, which is then amplified exponentially by repeated cycles of denaturation, annealing, and extension using a thermostable DNA polymerase.
In a PCR experiment starting with a single copy of double-stranded DNA, the amount of DNA in the reaction tube is doubled after each cycle of amplification. If there are N copies of DNA after n cycles, the number of copies of DNA after n + 1 cycles will be 2N. Therefore, the number of copies of DNA after 40 cycles of amplification starting with a single copy of double-stranded DNA will be:
2^40 = 1,099,511,627,776.
Thus, approximately 1,099,511,627,776 DNA molecules would be present in the reaction tube after 40 cycles of amplification.
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colorless structure behind the iris, sharpens the focus of light rays onto retina. is the meaning of ___
Answer: Lens
Explanation:
Behind the iris, the lens is made up of transparent proteins called crystallin and supported by ciliary muscles. It bends the light rays passing through it, to fall on retina where receptor cells sense.
State three reasons why the buffalo population increased after being placed in the
Serengeti National Park.
In recent years, conservation efforts, responsible farming, and an ambitious rehabilitation effort have led to a boom in the buffalo population. Small and isolated, the population is growing with about 350,000 plains buffalo in production herds, 30,000 in public herds, and about 20,000 in tribal herds.
What is Conservation?Nature conservation is defined as the ethical philosophy and conservation movement that focuses on protecting species from extinction, maintaining and restoring habitats, enhancing ecosystem services, and protecting biological diversity.
An example of conservation is a program to try to preserve wetlands, a program to try to save old buildings, etc.
Thus, conservation efforts, responsible farming, and an ambitious rehabilitation effort have led to a boom in the buffalo population.
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what happens when a number of organisms in an environment is higher than the carrying capacity
When the number of organisms in an environment is higher than the carrying capacity, the population most probably will decrease.
What is the carrying capacity?
The carrying capacity of an ecosystem is described as the maximum number of individuals that can be supported by a habitat. Every ecosystem has a fixed carrying capacity. The carrying capacity of any habitat primarily depends on two factors which is highlighted below:
The Food to eat.The space to live.If the number of organisms in an environment is higher than the carrying capacity, they feel the scarcity or limitation of food to eat and space to live, this creates more competition between the members of the same or different species which may lead to fighting for survival and death of the weaker organism.
We can conclude that any organism that has favorable variations of relative fitness will survive, and the rest will be eliminated by a habitat.
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The cell theory is one of the unifying themes of biology. Which of the following
statements would not be part of cell theory?
Cells are the building blocks for all organisms
All organisms must be made of more than one type of cell
All life is made of cells
Cells come from preexisting cells
Cells are the smallest units of life
Answer: All organisms must be made of more than one type of cell
Explanation:
Help me please finish the hypothesis! Only have 2 minutes No websites
HYPOTHESIS: If 2 chambers of water are poured side-by-side, the warmer water will mix the cooler layer because it
Answer:
The warmer water will mix with the cold water because it will migrate to the surface.
Explanation:
If hot water and cold water are poured in the same place, it means that they will occupy the same space. However, hot water has a lower density than cold water, which means that hot water molecules are lighter and will tend to rise towards the surface.
However, when migrating to the surface, the hot water molecules will pass between the cold water molecules, causing the two waters to mix. In this process, the hot water will transfer heat to the cold water and cool until the two waters have the same temperature.
Según la clasificación de ecosistemas, indica si los siguientes ejemplos de ecosistemas son correctos: Una piscina es un ecosistema acuático y seminatural La pradera es un ecosistema terrestre y natural Un bosque nativo es un ecosistema terrestre y natural Un arroyo es un ecosistema dulceacuícola y natural El mar es un ecosistema marino y artificial Las ciudades son ecosistemas terrestres y seminatural Las represas son ecositemas seminatural y acuático
Answer and Explanation:
Una piscina es un ecosistema acuático y seminatural: FALSO. La piscina corresponde a un ecosistema acuático, siempre y cuando existan seres vivos habitando en ese medio e interactuando entre ellos y con los factores físicos como temperatura del agua, pH, etc. No corresponde a un medio seminatural porque su origen es totalmente artificial, es decir, hecho por el hombre.La pradera es un ecosistema terrestre y natural : VERDADERO. Es terrestre por encontrarse en un espacio continental no inundable, y natural por no ser intervenido por el hombre. Un bosque nativo es un ecosistema terrestre y natural: VERDADERO. Un bosque no es inundable, por lo que se considera netamente terrestre y mientras no sea intervenido por la acción humana es un ecosistema natural. Un arroyo es un ecosistema dulceacuícola y natural: VERDADERO. Entre las posibles ubicaciones de un ecosistema acuático, se hayan aquellos que se encuentran en un medio de agua dulce, tales como arroyos, lagos, ríos, entre otros. Al no ser alterado por el hombre, se lo considera también un ecosistema de origen natural. El mar es un ecosistema marino y artificial: FALSO. El mar sí es un ecosistema acuático marino. Sin embargo no es un ecosistema alterado o creado por el hombre en forma artificial, sino que tiene un origen plenamente natural. Las ciudades son ecosistemas terrestres y seminatural: FALSO. Pueden ser consideradas terrestres por estar ubicadas en el continente, pero son de origen artificial por ser creadas por el hombre. Las represas son ecositemas seminatural y acuático: VERDADERO. Las represas son creadas en un medio natural que ha sido parcialmente modificado por el hombre, lo que las convierte en seminaturales. Corresponden a ecosistemas acuáticos de agua dulce.When a receptor responds normally when first exposed to a neurotransmitter but then eventually fails to respond despite the continued presence of the neurotransmitter, this is known as
When a receptor responds normally when first exposed to a neurotransmitter but then eventually fails to respond despite the continued presence of the neurotransmitter, this is known as receptor desensitization.
Receptor desensitization is a process in which the neuron or receptor becomes less responsive to a stimulus or particular drug over time despite continued exposure. Receptor desensitization happens when a receptor initially responds to a stimulus but then gradually loses its sensitivity to it despite constant exposure to it. Desensitization can be reversible or irreversible, and it can have a significant impact on the efficiency of pharmacological therapy.
Desensitization is a regulatory mechanism that occurs in response to prolonged or repeated stimulation of a receptor. It involves a decrease in the receptor's responsiveness or sensitivity to the neurotransmitter. This process helps maintain the proper functioning of neuronal signaling by preventing overstimulation or excessive activation of the receptor.
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Which part of Pakicetus anatomy most suggests that it is an ancestor of whales?
OPTIONS
Eyes near the top of the head
Ears adapted partly for hearing underwater
Teeth consistent with a carnivorous diet
Four legs
The part of Pakicetus anatomy that most suggest it is an ancestor of whales is ears adapted partly for hearing underwater.
Pakicetus is an extinct early mammal believed to be closely related to the ancestral line of whales. One of the key pieces of evidence supporting this relationship is the structure of its ears. Pakicetus had specialized ear bones that show adaptations for hearing underwater.
The ear structure of Pakicetus contains a specialized bone known as the involucrum, which is similar to the ear bones found in modern whales. The involucrum is thickened and dense, indicating adaptations for underwater hearing. This adaptation suggests that Pakicetus and its descendants gradually transitioned to an aquatic lifestyle and relied on hearing underwater, a feature that is prominent in modern whales.
While other options, such as eyes near the top of the head and teeth consistent with a carnivorous diet, may also be present in whales, it is the presence of ears adapted for hearing underwater that provides strong evidence of the evolutionary link between Pakicetus and the ancestors of whales.
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