Explain how it is possible to have thousands of different proteins when there are only 20 different amino acids

Explain why some cells in a females body respond to reproductive hormones while other cells do not.

Melanocytes and keratinocytes work together in protecting the skin from uv damage when keratinocytes a. provide the melanocyte with a protective shield against abrasion b. maintain the appropriate temperature so the product of the melanocyte will not denature c. maintain the appropriate ph in order for the melanocyte to synthesize melanin granules d. accumulate the melanin granules on their superficial portion, forming a uv-blocking pigment layer

True or false: determining the source and motive of an ad for a health product will you decide whether the ad is a reliable source of health information.