★ Anatomy and Physiology Quiz
Nails are composed of a protein called
A. melanin
B. keratin
C. proline
D. cytosine
Select your answer:
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Male Reproductive System › ViewThe male reproductive organ that stores maturing sperm is the
A. Epididymis
B. Vas Deferens
C. Prostate Gland
D. Urethra
Skin Growth › View
The stratum germinativum is composed of several layers with special cells that produce a dark skin pigment called:
A. granules
B. melanin
C. elongated
D. keratin