What is the function of the layer of dead keratinocytes on the top of the epidermis?

Explanation:

1. Keratinocytes are maintained at various stages of differentiation in the epidermis.

2. Keratinocytes  are responsible for forming tight junctions with the nerves of the skin.

3. The outer layer of skin, the epidermis containing keratinocytes, which provides waterproofing and serves as a barrier to infection.  

4. It is barrier to foreign particles and provide physical strength.  

5. It helps in innate immune system.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

the answer to your question is:

c. complementary base-pairing