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son4ous [18]
2 years ago
7

The ____ is the most important mechanical barrier.​

Biology
1 answer:
kirill [66]2 years ago
5 0

Answer:

your skin

Explanation:

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Some cells release substances that can travel to other cells in the body and be detected by checkpoint proteins. This signals th
mash [69]

Answer:

Growth factors

Explanation:

Growth factors, unlike hormone, have an influence on most cells on the body. They promote cell division and differentiation. Therefore, they are significant in promoting the cell cycle. Therefore, they should be able to be recognized by checkpoint proteins that regulate the cell cycle by either promoting progression or arresting the cell cycle.

6 0
2 years ago
HELP!
Lynna [10]

Answer:

A. a protein

Explanation:

Proteins function as enzymes in most of the catalyzing reactions, that increases the rate of reaction within cell.

Proteins are consist of multiple numbers of amino acids and the twisting and folding amino acids provide a unique identity to enzymes. Not all the proteins are enzymes but all the enzymes are proteins.

For example: Trypsin, Pepsin, and Lipases.

Hence, the correct option is "A. a protein".

5 0
3 years ago
Which structure helps to prevent food from entering the trachea during swallowing?
zlopas [31]

Answer:

The Epiglottis

3 0
2 years ago
A measurement must include both a number and a(an) _______.
Nuetrik [128]
Answer an unit of measurement.
For example: inch, hour, minutes, feet, meters.
4 0
2 years ago
Which are characteristics of scientific questions? Check all that apply.
lisov135 [29]

Answer:

asking about subjective matters, addressing a gap in knowledge, and already having fully confirmed explanations

Explanation:

4 0
3 years ago
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