The geographic area on the continent of Africa that is
hardest hit by AIDS is
a. northern Niger.
b. southwest Ireland.
c. sub-Saharan.
d. costal South Africa.
e. none of these.
Answer: c
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A moss spore develops into a young gametophyte called a(n) ____
a. gametangium b. antheridium c. protonema d. prothallus e. archegonium
Sperm are formed from the direct maturation
of a. sperm mother cells. b. spermatids. c. spermatogonial cells. d. primary spermatocytes. e. secondary spermatocytes
The placenta is detached from the uterus during which one of the following stages of labor?
A) placental B) dilation C) secretory D) expulsion E) afterbirth
A scientist has been growing a bacterial strain for some time in culture media containing very few nutrients. The cells are growing slowly, so she enriches the media with amino acids and carbohydrates. To her dismay, instead of growing faster and to higher densities, the bacteria begin to die. What has caused this strange result?
A. The bacteria are infected with a virulent phage, and has switched from the lysogenic cycle to the lytic cycle. B. A prophage switched from the lytic cycle to the lysogenic cycle. C. The bacteria are infected with a temperate phage. D. A prophage switched from the lysogenic cycle to the lytic cyle. E. The bacteria are infected with a temperate phage, and has switched from the lysogenic cycle to the lytic cycle.