Which of the following IS NOT a part of the cell theory? *
All organisms are made of one or more cells
All cells contain nuclei and membrane bound organelles
Cells arise from pre-existing cells
Cells are the basic units of structure and function
Answers
Answer:
all cells contain nuclei.
Explanation:
prokaryotes dont have a nuclei
Related Questions
which terms refers to the part of the pns that carries signals from various receptors to the cns
Answers
The terms that refer to the part of the PNS that carries signals from various receptors to the CNS is the afferent division of the PNS. Afferent Division of the PNS The afferent division of the peripheral nervous system (PNS) is also known as the sensory-somatic nervous system.
It is made up of nerve cells that are responsible for receiving sensory information from the external world and transmitting it to the central nervous system (CNS).Afferent nerves can be found in almost every organ of the body. Afferent nerves, for example, receive signals from sensory receptors in the skin, eyes, ears, nose, and tongue, as well as from internal organs such as the stomach and bladder.
Afferent nerves transmit sensory information from these areas to the spinal cord, which then sends the information to the brain for processing. When this occurs, a person becomes aware of what is happening in their environment and can respond accordingly. In a nutshell, the afferent division of the peripheral nervous system carries signals from various receptors to the CNS.
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identify where Specialised cells are found,the job and the adaptation of:
Nerve cell
Sperm cell
Red blood cell
Egg cell
Answers
Explanation:
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The diagram below shows a stack of rock layers. These layers have not changed position since they formed.
Layer 3 is younger than layer __ and older than layer __
Answers
Answer:
4 and 2
Explanation:
Explain how genetic engineering has impacted the fields of medicine, forensics, and
agriculture (e. G. , selective breeding, gene splicing, cloning, genetically modified organisms,
gene therapy).
Answers
Genetic engineering, often known as genetic modification, is a technique that modifies an organism's DNA through the use of technology developed in laboratories.
In the field of medicine, bacteria that can produce human growth hormone, human insulin, alpha interferon, a hepatitis B vaccine, and other medically beneficial chemicals have been developed using recombinant DNA technology.
Agriculture has previously made substantial use of genetic engineering to improve organisms, particularly in the form of genetically modified (GM) crops (also known as GMO —genetically modified organisms). For instance, crops and livestock have been genetically altered to be resistant to pesticides and herbicides, allowing farmers to use such substances to manage weeds and insects on those crops without running the risk of causing plant damage.
The variances are largely used in forensic applications of DNA typing to personal identification. Advances in molecular genetics have made it possible to analyze the person-to-person variations in sections of DNA that are not involved in coding for proteins.
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a fruit fly of genotype br/br is testcrossed with a fruit fly of genotype br/br. in 84% of the meioses, there are no chiasmata between the linked genes, but in 16% of the meioses there is one chiasmata between the genes. what proportion of the progeny willbe br/br?
Answers
The proportion of the progeny will be Br/br is 4%,
A chiasm is a form of the crossing of two chromatids of a chromosome with its homologous chromosome pair. Crossing over is the exchange of non-sister chromatid segments of a pair of homologous chromosomes. Crossing over occurs during the meiotic division I, namely at the end of prophase I or the beginning of metaphase I.
B and R are linked genes in fruit flies. Fruit fly genotype BR/br crossed with br/br. In 84% of meiosis there are no chiasmas between linked genes; In 16% of meiosis there is a single chiasm between genes.
Parental: BRbr >< brbr
Genom: BR, br, bR, Br >< br
Filial:
BR/br_____ ¼
br/br______¼
bR/br_____ ¼
Br/br______¼
The proportion of the progeny will be Br/br:
Br/br ¼ ⇒ ¼ x 16% = 40%
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Electrons have a small:
shell around them
positive charge
negative charge
Answers
Answer:
They have a negative charge since they are represented by a minus sign.
Select the correct statement about the three-chambered hearts of amphibians and nonbird reptiles. A scheme of blood circulation of reptiles except for birds. The reptiles have a three-chambered heart that consists of two atria and one ventricle with an incomplete septum. There are two circuits: pulmonary and systemic. In the pulmonary circuit, the blood from the right ventricle is pumped in to lung capillaries and returned to the left atria. In the systemic circuit, the blood is pumped from the left ventricle to the systemic capillaries via the left systemic aorta and is then returned to the right atria. There is also one vessel going from the right ventricle to the aorta right before it branches to smaller arteries. This vessel carries mixed blood. All blood on the right side of the circuits is venous and all blood on the left side is arterial. Select the correct statement about the three-chambered hearts of amphibians and nonbird reptiles. The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart. The three-chambered heart is inferior to the four-chambered hearts of birds and mammals, limiting the evolutionary success of amphibians and nonbird reptiles. Pulmonary and systemic blood fully mixes in the ventricle of a three-chambered heart.
Answers
Answer:
The three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart.
Explanation:
In Anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
I. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
II. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
All amphibians and reptiles except for crocodiles (having four-chambered heart) have three-chambered hearts, which typically comprises of a partially divided ventricle and two atria.
Hence, the correct statement about the three-chambered hearts of amphibians and nonbird reptiles is that, the three-chambered hearts of amphibians and nonbird reptiles are facultative, allowing variation in blood flow through the heart due to the partially divided ventricle.
It is proper to put the _____________ allele before a recessive allele when determining the genotype of the offspring in a Punnett square.
Answers
Answer:
dominant
Explanation:
the dominant allele is the capital letter (for example, T) whereas the recessive allele is the lowercase letter (for example, t). the dominant allele is usually written first.
It is proper to put the dominant allele before a recessive allele when determining the genotype of the offspring in a Punnett square.
What are alleles?Alleles are the variation present in the gene or DNA sequence. It is the sequence of nucleotides that encodes the production of the product of a gene.
There are two types of alleles, dominant and recessive, the dominant gene is denoted by a capital letter, and it is placed before the recessive allele.
Thus, in a Punnett square, the dominant allele should come before the recessive allele when determining the genotype of the offspring.
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In any population there will be variations of certain characteristics. For example, in the giraffe population there is a variation in the neck lengths among individuals. Some have longer necks and some have shorter necks. Giraffes with a longer neck variations would be more likely to survive than shorter-necked giraffes in which of these situations?
Answers
Answer: Monkeys swarm in and tear off all of the lower leaves to use for shelters
Explanation:
Question is incomplete:
A) loggers come in and chop down all of the trees
B) insects can only eat the highest leaves due to the canopy
C) a plant disease infects the trees, resulting in total leaf death.
D) monkeys swarm in and tear off all of the lower leaves to use for shelters
Giraffes are the tallest animals found on Earth. They live in open forest, savannahs and grasslands where they feed from the leaves of trees. Because of their height, they can reach places that are inaccesible for many other herbivores.
If a mutation or variation occurs in the population, which causes some giraffes to have higher necks, they will have a better chance of surviving since they can reach tree leaves at higher altitudes. While giraffes with shorter necks do not have as much of a feeding advantage, they can only reach leaves at lower altitudes, thus limiting the availability of food.
But referring particularly to the different situations:
A) If loggers chops all of the trees, then the entire population would die. It does not matter if they have a long or short neck, there will be no trees to feed on.
B) If the insects eat the highest leaves, then both short and long neck giraffes would be able to feed with the lowest leaves of the trees.
C) If all the leaves are lost, then both short and long neck giraffes would die because none will find food.
D) If monkeys tear off all of the lower leaves, then only leaves will be available at the top of the trees, which can only be reached by giraffes with long necks. Those with short necks will not have food. In this situation, giraffes with a longer neck variation would be more likely to survive than shorter-necked giraffes.
Articulations are classified by their function or structure. Which of the following is an example of functional classification?
Answers
Answer:
d. Synarthrotic joints
Explanation: is correct for the choices offered.
1. Based on the relative humidity in the room (average for the 3 trials), would a drop of water on your hand evaporate? If so, do you think it would evaporate quickly? Explain your answer. (5 pts)
Answers
Answer:
Yes.
Explanation:
Because the air is not at its max saturation point, which means that it could possibly melt in your hand.
Predisposition to diverticular disease, constipation, and colon cancer may be caused by diets that are:__________.
Answers
Predisposition to diverticular disease, constipation, and colon cancer may be caused by diets that are: Diets low in fiber and high in processed foods and red meat.
The predisposition to diverticular disease, constipation, and colon cancer can be influenced by certain dietary factors. Diets that are low in fiber and high in processed foods and red meat have been associated with an increased risk of these conditions.
Fiber plays a crucial role in maintaining bowel regularity and preventing constipation. A diet lacking in fiber can lead to decreased stool bulk and slower transit time through the colon, increasing the likelihood of constipation. Similarly, low-fiber diets have been linked to an increased risk of diverticular disease, which is characterized by the development of pouches (diverticula) in the colon wall.Furthermore, diets high in processed foods and red meat have been associated with an elevated risk of colon cancer. Processed foods often contain additives, preservatives, and high levels of saturated fats, which may contribute to inflammation and oxidative stress in the colon. Red meat consumption has been linked to the production of certain carcinogens during digestion, potentially increasing the risk of colon cancer.To reduce the risk of these conditions, individuals should aim to include a variety of high-fiber foods such as fruits, vegetables, whole grains, and legumes in their diet. Additionally, limiting the intake of processed foods and red meat can be beneficial for colorectal health.
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During which of the following processes is carbon released into the atmosphere as carbon dioxide?
OA. photosynthesis and combustion
respiration and photosynthesis
OC. respiration and combustion
OD. combustion and sedimentation
22 of 30 Answered
Session Timer: 3:55
Answers
Answer:
Respiration and Combustion
Explanation:
Carrots that are immersed in salt water for several hours become limp and soft. From this we can deduce that the cells of the carrots are
Answers
When carrots become limp and soft when immersed in salt water for several hours, it can be deduced that the cells of the carrot are hypotonic when compared to the salt water.
Hypotonic refers to the those cells or solutions that have more quantity of solvent and less quantity of solutes when compared to another cell or solution. The result of hypotonicity is that the cell or solution loses solvent in order to increase the solvent concentration in the other cell/solution.
Cell is the fundamental unit of living organisms. A cell consists of all the essential components required for its survival. Cells can be categorized into two forms: prokaryotic cell and eukaryotic cell. Eukaryotic cells further have two types: plant cell and animal cell.
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A genetic crass with two genes produces 400 offspring, and 20 of them have recombinant phenotypes.
What is the recombination frequency for this cross?
20%
O5%
O 1%
50%
10%
Answers
The recombination frequency for this cross is indeed 5%. Therefore, the correct answer is B - 5%.
The recombination frequency in this cross can be calculated by determining the proportion of offspring that exhibit recombinant phenotypes out of the total number of offspring. In this case, out of the 400 offspring, 20 have recombinant phenotypes.
Recombination frequency is a measure of the likelihood of two genes being separated from each other during the process of genetic recombination. It is influenced by the distance between the genes on the chromosome. If two genes are far apart, they are more likely to be separated during recombination, resulting in a higher recombination frequency. Conversely, if two genes are close together, they are less likely to be separated, resulting in a lower recombination frequency.
To calculate the recombination frequency, divide the number of recombinant offspring by the total number of offspring, and then multiply by 100 to express it as a percentage.
Recombination frequency = (Number of recombinant offspring / Total number of offspring) x 100
In this case, the recombination frequency would be:
(20 / 400) x 100 = 5%
Therefore, the correct answer is B - 5%. The recombination frequency for this cross is 5%.
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Complete question:
A genetic crass with two genes produces 400 offspring, and 20 of them have recombinant phenotypes.
What is the recombination frequency for this cross?
A - 20%
B - 5%
C - 1%
D - 50%
E - 10%
Anaerobic respiration is used in conditions that: A. require nitrogen. B. are depleted of glucose. C. have too much oxygen. D. are depleted of oxygen.
Answers
Answer:
D. Are depleted of Oxygen
Explanation:
Anaerobic respiration occurs when the amount of oxygen available is too low to support the process of aerobic respiration
Anaerobic respiration is used in conditions that are depleted of oxygen. The correct option is D.
What is anaerobic respiration?Anaerobic respiration is the one that does not need oxygen to perform respiration. The process includes the breakdown of Glucose into ethyl alcohol, carbon dioxide, and energy in the absence of oxygen. It occurs only in the cytoplasm.
Certain bacteria and Archean perform anaerobic respiration because they are present in the region where oxygen is not present, in extreme conditions.
Many chemical processes are also done in the absence of oxygen. Like lactic acid fermentation, decomposition, and alcoholic fermentation. When the high-intensity workout is done, the body performs anaerobic respiration.
Thus, The correct option is D. are depleted of oxygen.
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In a coal-burning power plant, the coal is an example of a system _____.
A. Product
B. Throughout
C. Output
D. Model
E. Input
Answers
In a coal-burning power plant, the coal is an example of an Input System. So, the correct option is (E).
What is Coal burning power plant?Coal-burning power plants are defined as those plants that produce electricity by burning coal in boilers to generate steam. The steam produced under extreme pressure flows into a turbine, which spins a generator to create electricity, then it cools, condenses back into water and returns to the boiler to start the process.
About 50% of coal is used as the primary fuel for power generation. The main function of a coal fired thermal power plant is to convert the energy available in the coal into electricity where as power plants work by using multiple stages to convert the stored energy coal for usable electricity which is an example of input system.
Thus, In a coal-burning power plant, the coal is an example of an Input System. So, the correct option is (E).
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the major elements of the fsma can be divided into
Answers
The major elements of the FSMA (Food Safety Modernization Act) can be divided into five key components: preventive controls, inspection and compliance, imported food safety, response to foodborne illness outbreaks, and enhanced partnerships.
The FSMA, signed into law in 2011, aims to modernize and strengthen the food safety system in the United States. The five major elements reflect the key areas of focus in the act to ensure the safety of the food supply and prevent foodborne illnesses.
1. Preventive Controls: This component emphasizes the implementation of preventive measures by food facilities to identify and address potential hazards in food production, processing, and storage.
2. Inspection and Compliance: It focuses on enhancing the frequency and effectiveness of inspections conducted by the FDA (Food and Drug Administration) to ensure compliance with food safety regulations.
3. Imported Food Safety: This element aims to strengthen the safety of imported food by requiring foreign suppliers to meet U.S. safety standards and implementing a risk-based approach for imported food inspections.
4. Response to Foodborne Illness Outbreaks: It involves improved coordination and response mechanisms between federal, state, and local agencies to quickly identify and address foodborne illness outbreaks.
5. Enhanced Partnerships: This component emphasizes collaboration and information sharing among various stakeholders, including industry, government agencies, and consumer groups, to promote a more integrated and effective food safety system.
Overall, these major elements of the FSMA work together to prevent, detect, and respond to food safety risks, ensuring the protection of public health and the safety of the food supply.
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Which uses less energy: Reactions with enzymes or Reactions without enzymes?
NO LINKS!
Answers
Some strains of Mycobacterium tuberculosis are resistant to so many antibiotics that it has become known as a(n)
Answers
Answer:
\(\huge\boxed{\sf Multidrug\ resistant}\)
Explanation:
Antibiotics:
"Medicines used against bacteria are called antibiotics."
Example:
Rifampin, isoniazid.
Mycobacterium Tuberculosis is a bacteria.
However, some of its strains are resistant to antibiotics and thus is classified as multidrug resistant (MDR resistant)
\(\rule[225]{225}{2}\)
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~AH1807a students is working on drawing and labeling a very basic model showing how cellulose is broken down. The students work on the model so far is shown below. Based on the passage above, revise the students model so that it is correct and complete. Be sure to clearly identify all your revisions to the model.
Answers
Through catabolic action, cellulase breaks down cellulose. The cellulose binds the enzyme by the active sites, composing the cellulase-cellulose complex. Then, cellulase breaks the molecule and turn it into monomers.
How is cellulose broken down?Cellulose is broken by the action of cellulase. This enzyme is in charge of catalyzing cellulose lysis and turning it into smaller components. This metabolic action is known as catabolism.
Catabolism is the process by which a complex, large molecule (in this case, cellulose) is broken into simpler smaller molecules. The enzyme gets in contact with the substrate and breaks it apart into pieces.
The large molecule binds its enzyme by the active site, composing the enzyme-substrate complex. Finally, the enzyme turns the substrate into product molecules.
You will find the complete labelled image in the attached files.
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81. suppose that following a lava flow, pine grass (a hypothetical species) is the first species to colonize the area. chemicals produced by pine grass change the soil chemistry in the environment, but these chemicals promote subsequent colonization by later species. which model would best explain this scenario of succession? a. inhibition b. tolerance c. facilitation d. compensation
Answers
The model that best explains this scenario of succession is facilitation. Option c is correct.
In facilitation, early successional species change the environment in a way that makes it more suitable for later successional species. In this case, pine grass changes the soil chemistry to create conditions more favorable for other species to colonize the area. This is an example of positive interactions between species, where the presence of one species benefits another.
As a result, the area goes through a predictable sequence of changes, with each species creating conditions that favor the next. In contrast, the inhibition model suggests that early species prevent colonization by later species, while the tolerance model suggests that species do not affect each other's colonization. The compensation model suggests that the loss of one species is compensated by the growth of another. Hence Option c is correct.
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What seminal book did darwin publish that publicly expressed his theory of evolution by natural selection?.
Answers
The seminal book published by Darwin that publicly expressed his theory of evolution by natural selection is titled "On the Origin of Species".
Charles Darwin, a British naturalist, published the seminal book "On the Origin of Species" in 1859. The book put forward the theory of evolution by natural selection, which explains how new species develop and adapt to their surroundings in order to survive.The book's full title was "On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life."
It introduced Darwin's fundamental theory of evolution, which he had developed over a long period of observation and study.The book was highly influential and controversial in its day, as it challenged the widely held belief that God created all species in their current form. It sparked a debate that continues to this day, and has contributed to our understanding of the natural world in ways that Darwin himself could not have anticipated.
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Which of the following is an example of a nucleic acid?
Select one:
a. RUBISCO
b. ATP
c. NADH
d. RNA
Answers
Answer:
D. RNA
Explanation:
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If nondisjunction occurs in meiosis II, how many of the four gametes will be aneuploid?a. Oneb. Fourc. Twod. Three
Answers
If nondisjunction occurs during meiosis II, then two of the resulting gametes will be normal, containing the correct number of chromosomes. However, the other two gametes will be aneuploid, meaning they will have an abnormal number of chromosomes. One of the aneuploid gametes will have an extra chromosome, while the other will be missing a chromosome. Correct answer is option C
Nondisjunction is a genetic error that occurs during the process of meiosis in which one or more chromosomes fail to separate properly during cell division. When nondisjunction occurs during meiosis II, the four gametes that are produced will all be aneuploid, meaning that they will have an abnormal number of chromosomes. This means that all four gametes will contain either one less or one more chromosome than normal, and so none of them will be genetically normal. This type of aneuploidy is not viable, and so none of the four gametes will be able to develop into a viable embryo.
The effects of aneuploidy can vary significantly depending on the number and identity of the chromosomes involved. Having one extra or one missing chromosome can cause a range of developmental issues, and some aneuploid gametes can be viable. However, when aneuploidy occurs during meiosis II, all four gametes will be aneuploid and will not be viable.
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What smaller substance is the "building block" of all of the biomolecules?
1. Glucose
2. Molecules
3. Monomers
4. Polymers
Answers
Answer:
3 . Monomers
Explanation:
monomer is the term for a singular string
FILL IN THE BLANKS: Gametes are produced by meiosis, which are either __________ or _________.
Answers
Explanation:
Meiosis produces haploid gametes (ova or sperm) that contain one set of 23 chromosomes. When two gametes (an egg and a sperm) fuse, the resulting zygote is once again diploid, with the mother and father each contributing 23 chromosomes.
You cross a true breeding snapdragon with red flowers to a true breeding
snapdragon with white flowers. All of the resulting offspring are pink.
What are the expected phenotypes of the F2 generation?
Answers
i get an Ender dragon
Which ion is a found in a glass of water
Answers
In a glass of water, the most common ion found is the hydroxide ion (OH-) and the hydrogen ion (H+).
These ions are formed when water molecules dissociate through a process called self-ionization or autoionization.
In a glass of water, several ions can be found, originating from the dissociation of water molecules. The main ions present are hydrogen ions (H+) and hydroxide ions (OH-), resulting from the self-ionization of water.
Water molecules can break apart spontaneously into equal concentrations of H+ and OH- ions through a process called autoionization. This occurs when a water molecule donates a proton (H+) to another water molecule, forming H3O+ (hydronium ion) and OH-.
Additionally, other ions might be present in a glass of water depending on its source. For example, tap water can contain various dissolved ions like calcium (Ca2+), magnesium (Mg2+), sodium (Na+), chloride (Cl-), and bicarbonate (HCO3-). These ions come from minerals and other substances present in the water source, such as groundwater or surface water.
It's worth noting that the specific ion composition of water can vary depending on factors like location, treatment processes, and water source. However, the fundamental ions present in water are H+ and OH- resulting from the autoionization of water molecules.
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Why does the night sky look black?
Answers
Answer:
But the sky is dark at night, both because the universe had a beginning so there aren't stars in every direction, and more importantly, because the light from super distant stars and the even more distant cosmic background radiation gets red shifted away from the visible spectrum by the expansion of the universe.
One version implicated dust between stars and perhaps between galaxies. The idea was that the dust would block the light from faraway objects, making the sky dark. In reality, however, the light falling on the dust would eventually heat it up so that it would glow as brightly as the original sources of the light.Explanation: