Medical Quiz

Skin Structure, Growth, & Nutrition Quiz

the pigment produced to protect the skin from the effects of ultraviolet run rays is

A. keratin

B. melanin

C. elastin

D. collagen

Select your answer:
A  B  C  D  E 


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Other quiz: Reproduction

During spermatogenesis, which of the following cells is the first to become haploid?

A. primary spermatocyte

B. secondary spermatocyte

C. sperm cells

D. spermatid

E. spermatogonium