In contrast to sulfur mustard, lewisite and phosgene oxime exposures:
A) do not result in the formation of blisters.
B) have a delayed onset of signs and symptoms.
C) cause a change in the structure of the cells.
D) cause a rapid onset of signs and symptoms.
Answer: D) cause a rapid onset of signs and symptoms.
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Which of the following is most likely to be true about the mouse and rat myosin genes?
A. The nucleotide sequences are identical. B. The genes encode proteins with different functions. C. The genes are similar in sequence, but not identical. D. There is no homology between the two sequences. E. The genes encoding myosin closely resemble those encoding actins.
Why is it important to have a slow block to polyspermy?
A. The fast block doesn't work well. B. The slow block creates a permanent barrier. C. The fast block is actually slower than the slow block. D. It prohibits the acrosomal reaction. E. All of the choices are correct.
The single long process that extends from a typical motor nerve cell is the
a. axon. b. neuron. c. synapse. d. dendrite. e. cell body.
Where do fern antheridia develop?
a) on the tip of the sporophyte b) on the tip of the gametophyte c) on the underside of the sporophyte d) on the tip of the haploid protonema e) on the underside of the gametophyte