It has been estimated that 99% of the intestinal bacteria are
A. facultative anaerobes.
B. obligate aerobes.
C. facultative aerobes.
D. obligate anaerobes.
D
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Which one of the following types of culture media is selective and differential?
A) blood agar B) MacConkey agar C) phenylethyl alcohol agar D) Thayer-Martin agar
Human DNA can be replicated quickly because it has many
A) replication forks. B) genes. C) chromosomes. D) histones.
When you feel threatened, the neurotransmitter norepinephrine is released from the adrenal gland in response to
stimuli by ____ neurons.
a. somatic b. sensory c. sympathetic d. motor e. parasympathetic
The above figure of a young cuckoo pushing a
resident age out of the nest demonstrates a. imprinting behavior. b. displaying instinctive behavior. c. feeding a social parasite. d. a learned behavior. e. all of these