What is the function of inhibin?
a. To inhibit sperm production
b. To concentrate testosterone in the testes
c. To inhibit FSH secretion
d. To stimulate FSH secretion
e. To stimulate the interstitial cells to produce testosterone
c
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The full chemical name of DNA is
A) derived nucleic acid. B) dideoxyribonucleic acid. C) denatured ribonucleic acid. D) deoxyribonucleic acid.
Evidence shows that humans began to cultivate crops from approximately ____ years ago
a. 200,000 b. 100,000 c. 10,000 d. 2,000 e. 1,000
Which statement about cell walls is true?
A. Primary walls are laid down while the cell is still growing. B. Bacteria and plants have cell walls of the same chemical composition. C. The middle lamella glues the walls of adjacent cells together. D. Cell walls are laid down inside cell membranes.
Cnidaria and flatworms exchange gases and remove wastes by way of their
A. open circulatory systems. B. moist skin surfaces. C. closed circulatory systems. D. respiratory and excretory systems. E. gastrovascular cavities.