Some people cannot be infected with HIV because
A. they were vaccinated.
B. their cells have extra receptors for HIV.
C. their cells lack receptors that admit the virus.
D. they are already infected.
Answer: C
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One primary oocyte containing 46 doubled chromosomes yields only one ovum containing 23 unpaired chromosomes
Indicate whether the statement is true or false
The secretion of ADH is directly stimulated by _______
A) a change in body fluid osmolarity B) angiotensin II C) angiotensin I D) renin
Matching
A) A B) E C) D D) C E) B 1) Connective tissue sheath surrounding individual muscle fibers. 2) Bundle of muscle cells surrounded by a perimysium. 3) Connective tissue covering the exterior of a muscle organ. 4) Connective tissue surrounding muscle fiber bundles. 5) Individual muscle fiber.