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EleoNora [17]
3 years ago
15

Helper t cells and regulatory t cells ________.

Biology
1 answer:
hjlf3 years ago
4 0
It has to be a , T cells are are your killer cells
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Which is the best description or sample of epistasis?
forsale [732]

Answer:

<em>a) Alleles at one locus can hide or mask the effect of alleles at another locus </em>

Explanation:

Gene interactions happen between genes at different levels and have implications in the phenotypic expression, causing a wide genetic variability.  

Epistasis means "interruption" and refers to interactions between genes located in different loci in the same chromosome. An “epistatic gene” can alter, influence, or suppress the expression of a "hypostatic gene". Epistatic genes might be either recessive or dominant. When the epistatic gene is recessive, the interaction is known as "recessive epistasis".  While when the epistatic gene is dominant, the interaction is known as "dominant epistasis"  

Observing the altered phenotype proportions of the offspring can reveal which interaction is operating in the trait determination.  

 

7 0
3 years ago
Formulating hypotheses – Propose a hypothesis to account for the data related to the cell life spans of the lining of the esopha
gayaneshka [121]

Answer:

Hypothesis: If mucus production in the submucosal layer of the esophagus is insufficient, cell longevity is affected, because it interferes with the quality of connective tissue.

Explanation:

In a scientific research the hypothesis is an assumption, a possibility that will justify the purpose of the scientific research and will help in the establishment of all the steps of this research, so that it is possible to determine if the hypothesis is true or false. In other words, we can say that the hypothesis must be formulated as an assumption, before the research that will prove it or not.

An example of a hypothesis about research on the longevity of cells that line the esophagus is: "If mucus production in the submucosal layer of the esophagus is insufficient, cell longevity is affected, because it interferes with the quality of connective tissue."

5 0
4 years ago
_______waves do not require a medium, so can travel through a vacuum
liberstina [14]

Answer:

Electromagnetic waves

Explanation:

6 0
3 years ago
Help me thanks!!!!!!!!
kramer
The answer is this: In 2005, 27.99 males out of every 100,000 were diagnosed with melanoma. I did the quiz on Edge.
4 0
3 years ago
Explain Newton’s First Law and give an example of it
Ronch [10]

Answer:

When a person jumps out of a moving vehicle, he falls forward due to inertia of motion. One example of Newton's first law in real life is, when you are walking with a glass filled with water, you will notice that the water spills at certain locations when you walk at faster pace. The water inside the glass will remain at rest until you move.

Explanation:

6 0
3 years ago
Read 2 more answers
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