Refer to Figure 29-2. The structure labeled 11 is:
a. a zygote.
b. a gamete.
c. a sporangium.
d. a zoosporangium.
e. a zoospore
C
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Vibrio cholerae can be readily isolated and identified in the laboratory from stool samples by
A. its robust chemotactic response to the presence of chitin. B. dark-field microscopy looking for motility. C. its ability to grow at high temperature and produce zones of clearing on blood agar. D. growth on selective media followed by PCR of its 16S rRNA gene.
Steroid hormones bind to receptors in the nucleus to activate or deactivate genes.
a. true b. false
Some insecticides interfere with the removal of acetylcholine from the synaptic cleft. What effect will this have on muscle contraction?
A) The muscle cell will be unable to be stimulated again. B) The muscle cell will be in a state of constant stimulation, leading to a tetany response. C) The muscle cell will lose all of its supply of calcium. D) The muscle cell will have a single twitch and will be unable to contract again.
When genes for the same trait occur in a variety of forms, each unique form is called a(n) _____.
A) homologue B) allele C) mutant D) chromatid