What is the male's germ cell?
A. Spermatogonia
B. Sperm
C. Spermatozoa
D. Spermatid
Answer: A
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A vaccine against HIV
A. is available for those who can afford it. B. may be impossible due to the variability and diversity of HIV. C. prevents opportunistic infections. D. consists of cocktails of drugs taken daily.
What transport process uses the energy stored in a Na+ or H+ concentration gradient to drive other substances across the membrane against their own concentration gradients?
a) primary active transport b) secondary active transport c) facilitated diffusion d) passive diffusion e) osmosis
A ruptured follicle is transformed into the:
A. ovarian follicle B. corpus luteum C. antrum D. germinal epithelium
Osteoblasts are to bone deposition as:
A) osteoclasts are to bone resorption. B) osteocytes are to fat storage. C) osteocytes are to bone formation. D) osteoclasts are to hematopoiesis.