The distinct layers of stratified lichen are organized with the photosynthetic species ________
a. sandwiched between layers of fungi
b. against the rock or other substrate the lichen is growing upon
c. growing beside, but in contact with, the fungus
d. on the outside
a
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A colony of mice is treated with a noninfective form of the bacterium Streptococcus pneumoniae. A
new researcher exposes this noninfective form to heat-killed cells of an infective strain. What would be the effect of this action in the mouse population?
a. The mice will all remain healthy. b. Some mice will die, but most will live. c. The mice will get sick with pneumonia. d. Some will get sick with pneumonia, but most will live. e. The mice will become immune to the bacterium.
At ________ weeks, the fetal heartbeat can first be heard through a stethoscope.
A. 16 B. 4 C. 12 D. 30 E. 25
Hypoparathyroidism leads to a dramatic drop in blood calcium, which causes
A. tetany (convulsions). B. cretinism. C. sleepiness. D. mental retardation. E. lethargy and hair loss.
Some bacteria form dormant bodies called:
A. Lysogenic B. Cyst C. Capsule D. Endospores