The color of which skin pigment is genetically determined?
a. carotene
b. keratin
c. melanin
d. hemoglobin
Answer: c. melanin
You might also like to view...
The medical term for looseness is ________________________________________
Fill in the blank(s) with correct word
Of the fluid entering the small intestine, ____ percent is reabsorbed
a. 100 b. 95 c. 85 d. 50 e. < 50 percent
Oxygen deficit represents
A. the amount anaerobic metabolism must increase after exercise. B. the amount of oxygen converted to lactic acid during exercise. C. the amount of carbon dioxide that cells need to eliminate. D. conversion of pyruvic acid to lactic acid. E. the amount of oxygen that cells need to replenish ATP supplies after exercise.
Negative feedback loops are ________.
A. not homeostatic mechanisms B. homeostatic mechanisms C. associated with "vicious circles" D. self-amplifying cycles E. usually harmful