Bacteroids are
a. specialized nitrifying bacteria.
b. small buds from ammonifying bacteria.
c. specialized bacteria that help some plant roots absorb phosphorus.
d. enlarged and immobilized nitrogen-fixing bacteria.
e. interactions between plant root hairs and bacteria.
D
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Which of the following general transcription factor phosphorylates the C-terminal domain of RNA Pol II?
A. TFIID B. TFIIA C. TFIIH D. TFIIF
What type of population growth effect is a flood that washes away many rabbits of population?
a. a density-dependent factor b. a limiting factor dependent on the individuals c. a consequence of exponential growth d. a density-independent factor e. an initial carrying capacity
One function of HCl secreted in the stomach is to convert pepsinogen into the active enzyme pepsin. Why don't stomach cells simply secrete pepsin instead?
A. If cells produced active pepsin, they would digest their own cellular proteins. B. Only the pepsinogen version is able to stabilize fat-water emulsions. C. Pepsin is denatured and rendered inactive in solutions with low pH. D. Adequate amounts of pepsin are already manufactured by the pancreas.
Amyotrophic lateral sclerosis (ALS) disrupts muscle
contraction by a. binding actin. b. blocking myofibril. c. killing neurons. d. weakening myofilaments. e. none of these.