Which of the following is(are) true concerning markers and receptors?

T cells can bind to antigens even if they are not presented to them by APCs.

B and T cell receptors can accept antigens when they are presented to them.

Both B cells and T cells have specific markers.

MHC Class I markers are found on all cells with nucleus.

All human cells have markers on their surfaces used for communicating with other cells or molecules.

MHC Class II markers are found only on T cells.

Answer:

True

Explanation:

Answer:

i believe its D, amniotic eggs.

Explanation:

Answer:

A sunflower would be a producer out of the following.

Explanation:

The following people, cow, and mouse are consumers as the sunflower is a producer since it can produce it's own food as the others eat each other to recieve energy.

The following is a producer: sunflower, which is in the first option. Producers are always present at the primary trophic level and take part in the photosynthesis process.

A producer in the ecosystem has a significant role, as they play an important role in the ecosystem by producing their own food and later relying others for food and energy. They are also responsible for maintaining the carbon ,nitrogen, and oxygen balance in the atmosphere and maintaining the water balance by absorbing it in the ground and thus raising the groundwater level.

Hence, the following is a producer: sunflower, which is in the first option. Producers are always present at the primary trophic level and take part in the photosynthesis process.

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Answer:

give the girl above me brainliest shes my friend please

Explanation:

yrv-thks-szm live bio practical class is going on here

Answer:

In the heap method, the daily collections from cattle shed are spread in uniform layers until the heap attains a maximum height of 1 meter above the ground. The top of the heap is rounded and then plastered with dung and mud mixture. In both, the pit method and heap methods aeration is allowed in the beginning and later on anaerobic conditions set in and continue for a long period.

A pediatrician sees a patient who exhibits symptoms of gigantism and rapid growth. The anterior pituitary gland is probably affected in this individual. So the correct option is (e).

Pituitary adenoma or tumor is almost always the main cause of gigantism, a dangerous disorder. Patients with high exposure to growth hormone as children experience gigantism. Pituitary tumor cells secrete too much growth hormone (GH), causing numerous physiological abnormalities.

Normal GH production by the pituitary gland is disrupted by tumors, causing gigantism. Your pituitary gland is a small pea-sized endocrine gland located below your hypothalamus at the base of your brain. Among the eight key hormones that your pituitary gland secretes is GH..

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Answer:

The name is Atlas.

Answer: atlas

Explanation:

The C1 vertebrae is known as the atlas

3 ways a crayfish can help the environment are by Ecosystem Engineers, Detritivores and, Prey for Predators.

Crayfish, also known as crawfish or freshwater lobsters, can contribute positively to the environment in several ways:

1. Ecosystem Engineers: Crayfish are considered ecosystem engineers as they burrow into the soil or substrate of aquatic habitats. Their burrowing activities help to aerate the sediments, enhancing water circulation and nutrient cycling. By creating small tunnels and channels, crayfish improve the overall health of aquatic ecosystems and create habitat for other organisms.

2. Detritivores: Crayfish are detritivores, meaning they feed on decaying organic matter like dead plants and animals. By consuming and breaking down this organic material, crayfish contribute to nutrient recycling in the environment. This process helps to maintain water quality and reduces the accumulation of organic debris, benefiting the overall health of the ecosystem.

3. Prey for Predators: Crayfish serve as a food source for various aquatic predators, including fish, birds, and reptiles. Their presence in the food chain helps support populations of these predators, contributing to the balance and biodiversity of the ecosystem.

Overall, crayfish play an essential role in maintaining the ecological integrity and functioning of aquatic environments.

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Answer:

ribosome

Translation occurs in a structure called the ribosome, which is a factory for the synthesis of proteins. The ribosome has a small and a large subunit and is a complex molecule composed of several ribosomal RNA molecules and a number of proteins.

Explanation:

I hope this helps and pls mark me brainliest :)

Answer:

true

Explanation:

Answer: competition

Explanation: i guessed

Explanation:

any of a series of chemical reactions in photosynthesis not requiring the presence of light and involving the reduction of carbon dioxide to form carbohydrate especially : Calvin cycle

Answer:

Pseudomonas aeruginosa is one of the common germs (micro-organisms) found in cuts or other wounds in the skin. Pseudomonas aeruginosa is a bacteria that is most commonly found in hospital settings and can be spread through infected water.

Answer:

Cheap and great environment/nutrients

Explanation:

Petri Dishes are filled with nutrients and a bacteria specific surface to promote quick and visible grow

Answer:A frameshift mutation

Explanation: i think.

The type of mutation that occurred if you are missing or have an extra base at the end of your mutated DNA is known as Frameshift mutation.

A mutation may be defined as sudden, stable, and inheritable changes in the genetic material of an organism. An organism that undergoes the event of mutation is called a mutant. The agent that causes the mutation is called mutagen.

A deletion primarily results in a frameshift which then results when one or more base pairs are lost from the end of DNA. If one or two bases are deleted the translational frame is altered resulting in a garbled message and nonfunctional product.

A frameshift mutation is a type of genetic mutation which is significantly caused by the indels of a number of nucleotides within a DNA sequence. The insertion or deletion can alter the reading frame which results in a completely distinctive different translational from the original.

Therefore, frameshift mutation is a type of mutation that occurred if you are missing or have an extra base at the end of your mutated DNA.

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Answer:

Yes there are four types of tissues: connective, epithelial, muscle, and nervous tissues.

Hope this helped, good luck on your test!

-omii♡

To answer your question, there are a few positions and projections that can effectively demonstrate a hiatal hernia. A hiatal hernia occurs when the upper part of the stomach protrudes through the diaphragm into the chest cavity. One of the most commonly used projections is the upright position, where the patient is standing and the x-ray beam is directed horizontally.

In this position, the herniated stomach can be seen as a bulge above the diaphragm.
Another projection that can be used is the Trendelenburg position, where the patient is lying on their back with their feet elevated higher than their head. This position allows gravity to pull the herniated stomach back into its normal position, making it easier to detect the hernia.
In addition to these positions, a barium swallow test can also be used to diagnose hiatal hernias. This test involves drinking a barium solution, which highlights the internal structures of the digestive system on x-rays. The patient is then imaged in various positions to help identify any abnormalities, including hiatal hernias.
In conclusion, the upright and Trendelenburg positions, as well as the barium swallow test, can all be effective in demonstrating hiatal hernias. It is important to consult with a healthcare provider to determine the best course of action for diagnosing and treating a hiatal hernia.

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Answer:

A

Explanation:

In the planetary model, there is a nucleus with protons and neutrons, surrounded by orbits with electrons. In the krypton representation, there are 84 subatomic particles inside the nucleus and 36 outside.

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The representation of an element includes a superior number that indicates the massic number, and an inferior number that indicates the atomic number.

We need to know that every atom is identified by its number of protons and neutrons. So,  

Representation ⇒ ᵃ X ₀

Where  

• X is the element  

• a is representing the massic number, which is defined as the sum of the number of protons and the number of neutrons.  

• z is the atomic number, which is the number of protons ⇒ represented as  0 above

In electrically neutral atoms, the number of protons equals the number of electrons. This means that the atomic number also indicates the number of electrons.

We will call n to the number of neutrons, which equals a - z

So, what you need to know is that  

• Nº of protons = Atomic number → z  

• Nº of neutrons = Massic number - Atomic number → n = a - z  

• Nº of Electrons = Nº of protons = Atomic number → z

When representing these atom structures using the planetary model, there must be a nucleus surrounded by orbits.

In the nucleus there are protons and neutrons. In the orbits, there are electrons in different energetic levels.

• Nucleus → Protons + Neutrons → circle indicating number of P⁺ + N⁰

• Orbits → Around the nucleus → Following the energy levels

The energy levels indicate how many electrons, e⁻, maximum must be placed per level -orbit- → seven levels

In the exposed example, we have,

We know that the atomic number = number of protons = number of electrons, so  

• Nº of neutrons = Massic number - Atomic number → 84 - 36 = 48

• Nº of Electrons = Nº of protons = Atomic number → 36

According to the framework, we might assume that in a planetary model  representation, there are 84 subatomic particles inside the nucleus, and 36 subatomic particles outside.

• Inside the Nucleus → Protons + Neutrons → 48 + 36 = 84

• Outside the nucleus (Orbits) → Electrons → 36

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c) Coal is not considered biomass.

In the field of science, biomass can be described as such kind of fuel that is obtained from living organisms such as plants and animals. When the dead plants and animals are burned, fuel is produced which is biomass.

Coal is a resource that does not come from living organisms. Coal is a natural resource that is present in the earth in the form of coal rocks. Although coal is also an excellent fuel used for many purposes, it is not biomass because it is not obtained from the burning of living organisms.

The energy obtained from coal as well as biomass is considered to be a non-renewable resource because it cannot be recycled.

The question will correctly be written as:

which of the following is not considered biomass? group of answer choices

a) charcoal

b) animal manure

c) coal

d)crop residues

e) wood

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FGF-2 suppresses cellular senescence of human mesenchymal stem cells by down-regulating TGF-beta2, which helps to maintain the functional properties of these stem cells.

FGF-2, also known as fibroblast growth factor 2, is a protein that plays a role in suppressing cellular senescence of human mesenchymal stem cells. Senescence refers to the state in which cells lose their ability to divide and function properly. TGF-beta2, or transforming growth factor beta 2, is another protein that is involved in regulating cell growth and differentiation.

Here is a step-by-step explanation of how FGF-2 suppresses cellular senescence by down-regulating TGF-beta2:

1. FGF-2 is produced and released by cells in the body, including mesenchymal stem cells.
2. When FGF-2 is present, it interacts with specific receptors on the surface of mesenchymal stem cells.
3. This interaction triggers a signaling pathway within the cells, leading to the down-regulation or decrease in the production of TGF-beta2.
4. By reducing the levels of TGF-beta2, FGF-2 helps to inhibit or slow down the process of cellular senescence in mesenchymal stem cells.
5. As a result, the mesenchymal stem cells are able to maintain their proliferative capacity and retain their ability to differentiate into different cell types, which is important for tissue repair and regeneration.

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Answer:

Coral reefs is the answer.

Explanation:

Coral reefs are often called the "tropical rainforests of the sea" for their astounding richness of life. Due to their structural complexity, corals are one of the most productive ecosystems on Earth, providing important services to mankind including fisheries, coastal protection, medicines, recreation, and tourism.

Source: Internet

If the parental mice have heterozygous genotypes for fur color, then their offspring will exhibit a 3:1 ratio of dominant to recessive phenotypes for fur color.

This is because the heterozygous genotype contains one dominant and one recessive allele, and according to Mendelian genetics, the dominant allele will be expressed in three out of four offspring, while the recessive allele will be expressed in one out of four offspring.

Therefore, the specific genotype of the parental mice will determine the probability of their offspring inheriting dominant or the recessive alleles for fur color, resulting in a predictable ratio of phenotypes.

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--The given question is incorrect, the correct question is

"Use your knowledge of Mendelian genetics to write a hypothesis that answers the lab question, “What is the effect of the genes of the parental mice on the fur color of the offspring mice?” Be sure to use the “If . . . then . . . ” format."--

Sister chromatids differ from non-sister chromatids in that sister chromatids are two copies of a single chromosome and are products of the S phase of the cell cycle.

When a cell divides, there are two types of chromatids: sister chromatids and non-sister chromatids. During the early stages of cell division, chromatoids are produced. Nonsister chromatids appear during metaphase I of meiosis, whereas sister chromatids replicate from the same chromosome. The centromere links sister chromatids together. On the cell equator, the homologous chromosome pair contains non-sister chromatids. The fact that sister chromatids contain the same allele in the same loci, whereas non-sister chromatids do not, is the primary distinction between the two types of chromatids.

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Answer:

12345678910111213141516

Explanation:

When a large flood severely reduces the earthworm and caterpillar populations, it is predicted that the organisms in this food web will be affected in several ways, and the three impacts of this event on organisms in the food web include:  Reduced prey availability,  Shift in predator behavior, Impact on decomposer role.

Reduced prey availability: The reduction in earthworm and caterpillar populations will cause a decrease in available prey for the organisms that feed on them, such as birds and small mammals. This may lead to a decline in their populations due to increased competition for limited resources.

Shift in predator behavior: As the availability of earthworms and caterpillars decreases, predators that rely on them for food may start to shift their diet and target other organisms within the food web to meet their nutritional needs. This can cause changes in the interactions between species and may impact the overall balance of the ecosystem.

Impact on decomposer role: Earthworms play a crucial role in breaking down organic matter and maintaining soil fertility. With a decline in their population, the rate of decomposition in the forest ecosystem may slow down, potentially leading to a build-up of organic material and altering nutrient cycles. This could have consequences for plant growth and overall ecosystem productivity.

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