What is the process in which impulses jump from node to node?
A. Incomplete transfer
B. Saltatory conduction
C. Repolarization
D. Refractory action
E. Facilitated transmission
Answer: B
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If the copy number of a proto-oncogene is increased by gene duplication then the proto-oncogene has undergone
A. a missense mutation. B. gene amplification. C. a chromosomal translocation. D. retroviral insertion. E. a nonsense mutation.
Which of the following STDs can infect the nervous system?
A) gonorrhea B) chlamydia C) syphilis D) HPV infection
Which step is not involved in the fertilization of angiosperm flowers?
A. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style. B. Double fertilization produces an embryo and the endosperm. C. Pollen is transported to a stigma of a flower. D. The pollen tube grows until it reaches the ovule in the ovary. E. The style of the pistil contracts to bring the sperm closer to the embryo sac.
The chromatin structure in eukaryotic cells is much more complicated than that observed in prokaryotic cells. This is thought to be the reason that DNA replication occurs much faster in prokaryotes. How much faster is it?
(a) 2× (b) 5× (c) 10× (d) 100×