Answer:
The hair is made up of 95% keratin, a fibrous, helicoidal protein (shaped like a helix) that forms part of the skin and all its appendages (body hair, nails, etc.). Keratin is synthesized by keratinocytes and is insoluble in water, thus ensuring impermeability and protection for the hair.
Explanation:
FALSE
A sperm cell always has more mitochondria than a skin cell.
Why? The sperm's midpiece contains many mitochondria so that a supply of energy is available for the sperm to perform its function of traveling to and later fertilizing the egg.
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The most accurate answer is C.
The cytoskeleton is responsible for cell shape, motility (movement) and motility of organelles within a cell.
Unlike the human skeleton , the cytoskeleton is extremely dynamic, meaning the filaments that make up the cytoskeleton are able to shorten or lengthen very rapidly.
This dynamic nature is necessary for cells to be able to change shape, complete cell division, or migrate (move from one place to another).The cytoskeleton connects to every organelle and every part of the cell membrane.
Answer: Direct repair
Explanation:
The direct repair of the thymine dimer occurs through the process known as Photoreactivation in the presence of the visible light.
An enzyme known as photolyase recognizes the distortion that is present in the DNA helix, caused by thymine dimer.
This is a type of DNA repair mechanism which is used repair thymine.
Answer:
The endocrine glands
Explanation:
The endocrine glands secrete hormones into the surrounding interstitial fluid; those hormones then diffuse into blood and are carried to various organs and tissues within the body.
