Structure of DNA: What is DNA? See picture: fill it out thx!

Recessive alleles are the genes that do not express phenotypically when a dominant allele is present. In other words, their effect is masked by the presence of a dominant allele.

These alleles are expressed phenotypically only when two copies of them are present on the individual.

The correct option is a.

Answer:

Bacteria start to die, thereby changing the dye concentration in the medium and producing different colors

Explanation:

Bacillus cereus are Gram-positive, rod-shaped bacteria that form orange-pink colonies in agar media (e.g., BACARA medium, which is used for detection and enumeration of B. cereus). In this case, it is expected that after a long time without taking care of the culture, the bacteria started to die. Subsequently, lysed bacterial cells lost their dye which accumulated in some areas of the medium, thereby showing different colors ranging from an intense blue (areas with dead bacteria) to shades of pink (areas with bacteria still alive and viable).

The color of some colonies are changing bacause of long incubation due to death of bacteria.

Bacara agar medium:

It is used for detection and enumeration of B. cereus. Bacteria gives orange-pink colonies in the media.

This detection method only detects the live bacteria, but here bacteria are dieing because of lake of food in media.

Therefore, the color of some colonies are changing bacause of long incubation due to death of bacteria.

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Answer:

The definition of photosynthesis is

a chemical process that occurs in plants, algae, and some types of bacteria, when they are exposed to sunlight.

Answer:

Is the process where by the plant manufacture there own food in the presence of light

Answer:

Explanation:

Geological substratum refers to the solid rock or layer of Earth's crust that lies beneath the soil, sediment, or other surface materials.

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The claim states that the weather on an island will continue to be most like the weather where orangutans live. To evaluate this claim, we need to consider several factors:

Without specific details about the island in question, it is difficult to make a definitive assessment. However, if the island is located within or near the equatorial belt and shares similar climatic conditions with Southeast Asian rainforests, it is more likely to have weather resembling that of orangutan habitats.

It is important to note that climate can vary even within a specific region, so a thorough analysis of the island's climatic data would be necessary to make an accurate comparison. Additionally, factors such as changes in global climate patterns over time may also impact the accuracy of this claim.

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A mass extinction event is when over 75% of species die out in a relatively short period of time. Therefore, the correct answer is: D. 75%

Earth's biodiversity declines rapidly and widely during an extinction event. A significant shift in the variety and abundance of multicellular organisms indicates such an event. It occurs when both the rate of speciation and the rate of extinction outpace the background rate.

A short period of geological time known as a mass extinction occurs when a significant portion of biodiversity, or distinct species—such as bacteria, fungi, plants, mammals, birds, reptiles, amphibians, fish, and invertebrates—die.

Impacts from comets and asteroid, widespread volcanism, climatic changes, rapid shifts in geography and ocean currents, or a combination of these can all lead to mass extinctions. The extinction of a single species is a characteristic of the flora and fauna of Earth.

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Answer:

Probability is the chance that a given event will occur. The principle of probability allows us to predict the possible combinations of phenotypes in a genetic cross by using a diagram called Punnett squares. This diagram represents alleles and gives us the genetic variations formed during a cross. For example, a flower has one dominant allele for a blue color, which is represented by capital T, and one recessive allele for a pink color, which is represented by small t. When this flower is crossed with another flowering plant with the same type of alleles, which is Tt, the combinations produced for their offspring includes TT, Tt, tT, and tt.

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Answer:

False

Explanation:

A cell normally contains 23 pairs of chromosomes.

Answer:

b

Explanation:

a predator is a bear that kills and eats fish

Answer:

B. bear that kills and eat fish

Answer:

C

Explanation:

took the test

Answer:

An enzyme attracts substrates to it's active site, catalyzesthe chemical reaction by which products are formed and then allows the products to Daso create separate from the enzyme surface the combination formula by an enzyme and its abstract is is called the enzyme substrate complex.

Answer:

brainstem

Explanation:

The medulla oblongata in the brainstem is the region of the brain that controls primitive functions of the body.

The brain stem is located under the cerebrum in front of the cerebellum. It is made up of the pons, midbrain, and medulla oblongata. It connects the spinal cord to the brain for regulating primitive functions.

All the primitive functions are performed by the medulla oblongata of the brain stem including coughing.

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Answer:

renewable

groundwater

reforestation

Explanation: internet

Explanation:

A manipulated variable is a variable that is changed by the researcher. A manipulated variable is also called an independent variable. A responding variable is a variable that the researcher predicts will change if the manipulated variable changes.

Answer:

Manipulated Variable: In a process that is intended to regulate some condition, a quantity, or a condition that the control alters to initiate a change in the value of the regulated condition.

Eg: The number of hours spent studying. This is the variable that the teacher manipulates to see how it affects exam scores. Response variable: The exam scores. This is the variable that changes as a result of the manipulated variable is changed.

According to the information we can infer that in general the number of species has increased.

Based on the information in the graph, we can conclude that over the years the number of species has increased. In the case of grasses, it went from having 32 species to having 35. In the case of trees, it went from having 0 to having 24, and in the case of shrubs, it went from having 0 to having 18.

In the row that shows the total number of species, it went from having 32 to having 77, which means that it doubled the number of species in this period of time.

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Answer:

There are three major branches of biology – botany, zoology and microbiology.

Explanation:

Answer:

The key difference between sandy soil and loamy soil is that sandy soil is less fertile due to the low content of nutrients, moisture, and humus, whereas loamy soil has more nutrients, moisture, and humus and is more fertile.

Explanation:

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loam soil provides a well-balanced environment for plant growth, with good drainage, moisture retention, and nutrient availability.

Sandy soil, on the other hand, drains quickly but lacks moisture retention and nutrient-holding capacity, requiring additional irrigation and fertilization.

The choice of soil type depends on the specific needs of the plants and the environmental conditions in which they are grown.

Loam soil and sandy soil are two distinct types of soil with different characteristics and properties.

Loam soil is considered to be ideal for plant growth due to its balanced composition.

It is a combination of sand, silt, and clay particles. Loam soil has a granular texture and is often described as crumbly.

It has good drainage capabilities, allowing excess water to flow through while retaining enough moisture for plant roots.

The presence of silt and clay particles helps in retaining nutrients, making them available to plants.

Loam soil is fertile and provides a suitable environment for root development.

It offers a good balance of air spaces and moisture-holding capacity, promoting healthy plant growth.

Sandy soil, on the other hand, primarily consists of larger sand particles.

It has a gritty texture and is characterized by its high drainage capacity.

Sandy soil drains water quickly, which can be beneficial in preventing waterlogged conditions.

However, due to its coarse texture, it does not retain moisture well, making it prone to drought.

Sandy soil also has low nutrient retention capability, as nutrients tend to leach away with excessive watering or rainfall.

As a result, sandy soil often requires more frequent irrigation and the application of fertilizers to compensate for the lack of nutrients.

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The stages of bee development are egg, larva, pupa, and adult. Eggs hatch into larvae, which then transform into pupae. Finally, adult bees emerge and undergo further maturation.

The stages of bee development are:

1. Egg: The bee life cycle begins when the queen bee lays an egg in a honeycomb cell.

2. Larva: The egg hatches into a larva, which is a legless, grub-like creature. The larva is fed a special diet called royal jelly, which stimulates its growth.

3. Pupa: The larva undergoes metamorphosis and transforms into a pupa. Inside the sealed cell, the pupa undergoes various changes, developing into an adult bee.

4. Adult Bee: After completing the pupal stage, the fully developed adult bee emerges from the cell. The bee then undergoes further maturation, such as its exoskeleton hardening, wings expanding, and adult coloration appearing.

It's important to note that there are three castes of bees: queen, worker, and drone. The development process for each caste is similar, but the diet and size of the cells they are raised in differ, leading to their distinct roles within the colony.

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Answer:

Here are two examples of how homeostasis regulates different aspects of the body: Get homework help from firstgradeessays[at]gm ail. c om. Quality is a priority.

Body Temperature Regulation: The human body has a set temperature range (around 36-37 degrees Celsius or 98-99 degrees Fahrenheit) that needs to be maintained for optimal functioning. When the body temperature rises due to exercise or external heat, homeostatic mechanisms helps to cool the body. These mechanisms include sweating, which helps dissipate heat through evaporation. Dilation of blood vessels near the skin surface facilitates heat loss. Conversely, if body temperature drops, homeostatic responses like shivering and constriction of blood vessels occur to generate heat and conserve warmth.

Blood Glucose Regulation: Maintaining blood glucose levels within a narrow range is crucial for proper physiological functioning. After a meal, blood glucose levels increase, triggering the release of insulin from the pancreas. Insulin helps facilitate the uptake of glucose by cells, reducing blood glucose levels back to normal. On the other hand, when blood glucose levels drop (e.g., during fasting or exercise), the pancreas releases glucagon, which stimulates the liver to release stored glucose into the bloodstream. This process raises the blood glucose levels and restores homeostasis.

Explanation:

Answer:

Many factors influence the size of a population. Food, water, shelter, predation, and density are all things that can allow a population to grow or cause it to decline.

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Protein entry into the ER lumen is facilitated by signal sequences present in the proteins whereas transmembrane protein integration into the ER membrane requires transmembrane domains.

Protein entry into the ER lumen (or insertion into the ER membrane) and integration of transmembrane proteins into the ER membrane differ in their mechanism. The following is a description of the differences between these two mechanisms.

Protein entry into the ER lumen is facilitated by signal sequences present in the proteins. Signal sequences, or signal peptides, are short stretches of amino acids located at the N-terminal end of proteins that are destined for the ER lumen or secreted outside the cell. Signal sequences interact with signal recognition particles (SRP), which then transport the protein to the ER membrane. Afterward, the SRP binds to the SRP receptor, and the protein is translocated into the ER lumen. The nascent protein is then translated, modified, and folded in the ER lumen.In contrast to protein entry into the ER lumen, transmembrane protein integration into the ER membrane requires transmembrane domains.

Transmembrane domains are composed of hydrophobic amino acids that cross the hydrophobic lipid bilayer of the membrane. Transmembrane proteins are inserted into the ER membrane through two mechanisms: The first mechanism is the signal anchor sequence, where a stop-transfer anchor sequence retains the protein in the membrane. The second mechanism is the signal peptide cleavage, where signal peptides in the protein cleave after they enter the ER lumen, and the transmembrane domain remains in the membrane. The protein is then translated and folded in the membrane.

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The theory of primitive life on Earth is fascinating, there are countless scientists who try to explain how life began on Earth, but to be able to answer how the first living beings were we need to know that.....

The most widely accepted hypothesis about the origin of life today is the Oparin and Haldane hypothesis. According to this idea, the primitive Earth would be constituted by

which are constantly expelled by volcanic activities. The condensation of this water vapor gave rise to a cycle of rains, as these, upon reaching the still hot surface of the Earth, evaporate again, thus initiating a new cycle.

Through the action of the sun's ultraviolet radiation and constant electrical discharges, the elements present in the atmosphere began to react, giving rise to the first organic compounds, called amino acids. The rains carried these compounds to the primitive oceans, which formed when the Earth's surface cooled, allowing water to accumulate on the surface.

In primitive oceans, these amino acids joined together, forming protein-like compounds (proteinoids), and then, after further reactions, these gave rise to coacervates. These became more stable and complex, controlling their own chemical reactions and being able to self-duplicate, thus giving rise to the first living beings.

Some authors believe that the first organisms would be heterotrophs. This was due to the fact that the first organisms were simple, lacking the structure to carry out a more complex biochemical process to obtain food, for example, photosynthesis. Thus, these organisms fed on simple organic matter, presenting as the end product of this process carbon dioxide (CO2) and alcohol (C2H5OH), that is, the first living organisms would be fermentors.

With this information, we can say that the first living being on the planet was anaerobic, heterotrophic bacteria.

There have always been many theories about the origin of life on the planet, but this is the most acceptable among scientists, but it is necessary to know that they are not yet fully proven, so they continue as a theory.

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The effect of over usage of antibiotics in livestock farming is it leading to mass production of antibiotic resistant bacteria to develop.

This is defined as a substance which destroys or slows down the growth of bacteria in a body or surface.

It should however be used in moderate amounts as overuse can lead to a situation whereby the bacteria become resistant to the antibiotics thereby lessening the effect and not being able to cure the illness.

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Embryonated chicken eggs represents an in vivo method for cultivating viruses. (option c)

To cultivate viruses in a living system, an in vivo method is used. Among the options provided, embryonated chicken eggs are the most commonly used method for culturing viruses in a living organism.

HeLa cells: HeLa cells (a) are human cancer cells commonly used in laboratory research, but they are not a living organism suitable for virus cultivation.

Pure bacterial cell cultures: Bacterial cell cultures (b) are often used to study bacteriophages, which are viruses that infect bacteria. However, this method involves culturing viruses in bacterial hosts and does not involve a living organism.

Embryonated chicken eggs: Embryonated chicken eggs (c) are a widely used method for virus cultivation. In this method, viruses are injected into the developing embryo, which provides an environment for viral replication. The embryos provide a controlled and nutrient-rich environment for the viruses to grow and propagate.

Lung cell culture: Lung cell culture (d) involves growing lung cells in a laboratory setting. While this method can be used to study certain viruses, it is an in vitro (outside a living organism) method rather than an in vivo method.

In conclusion, the in vivo method for cultivating viruses among the options provided is embryonated chicken eggs. This method provides a living system in which viruses can replicate and propagate. (option c)

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The genotype of the F1 offspring is YyTt, and the phenotype is yellow and tall. The probability of each phenotype in the F1 offspring is as follows yellow and tall is 1/2 or 50%, green and short is 1/2 or 50%.

Genotype refers to the genetic makeup or combination of alleles present in an organism, while phenotype refers to the observable traits or characteristics expressed by an organism. Genotype represents the genes an organism carries, while phenotype represents the physical or observable features resulting from the interaction between genotype and the environment.

When a heterozygous ail yellow plant (genotype Yy) is crossed with a homozygous short green plant (genotype tt), the F1 offspring will have the genotype YyTt and the phenotype of yellow and tall. The probability of this phenotype occurring in the F1 generation is 50%. Additionally, there is a 50% probability of the F1 offspring having the phenotype of green and short.

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Salts, metals, and acids are three different types of substances exhibiting unique electrical properties.

Thus, salts are ionic compounds and exhibit electrical properties as they have both positively charged ions and negatively charged ions. They can dissociate in solution into their constituent ions to conduct electricity, but they can not conduct electricity in the solid state.

Like salts, metals also conduct electricity due to their free-moving electrons. They have high electrical conductivity and are used in electrical wiring and other applications. Acids release hydrogen ions when dissolved in water which allows them to conduct electricity because the hydrogen ions move freely and carry an electrical charge when acids are dissolved in water, thereby, exhibiting electrical properties.

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Answer:

The explanation will be filled down below

Explanation:

Prokaryotic: I could barely read anything do you think you could take a screenshot from the computer and post it on brainly?

Eukaryotic: I could barely read anything do you think you could take a screenshot from the computer and post it on brainly?

Both: I could barely read anything do you think you could take a screenshot from the computer and post it on brainly?

Option(B) Ureter is the correct option.

The ureter is a vital part of the urinary system in humans. It is a muscular tube that connects the kidneys to the urinary bladder. Each human has two ureters, one attached to each kidney, and they play a crucial role in the transportation of urine from the kidneys to the bladder.

The primary function of the ureter is to carry urine that is produced in the kidneys to the urinary bladder for storage before it is eliminated from the body through urination. The ureters accomplish this by using peristalsis, a wave-like muscular contraction, to propel urine along their length.

The ureters have a complex anatomical course. They originate from the renal pelvis, which is the funnel-shaped structure that collects urine from the kidneys. From there, they extend downward, crossing over the brim of the pelvis and passing behind the peritoneum, the membrane lining the abdominal cavity.

The efficient functioning of the ureters is essential for the proper elimination of waste products and maintenance of fluid balance in the body. Any obstruction or abnormality in the ureters can lead to conditions like kidney stones, urinary tract infections, or urinary reflux.

In summary, the ureters are muscular tubes that transport urine from the kidneys to the urinary bladder. They rely on peristaltic contractions to propel urine, and their structure and positioning help ensure unidirectional flow.

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