According to the concept of punctuated equilibrium,
A) natural selection is unimportant as a mechanism of evolution.
B) given enough time, most existing species will branch gradually into new species.
C) a new species accumulates most of its unique features as it comes into existence.
D) evolution of new species features long periods during which changes are occurring, interspersed with short periods of equilibrium or stasis.
E) transitional fossils, intermediate between newer species and their parent species, should be abundant.
Answer: C) a new species accumulates most of its unique features as it comes into existence.
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Recent research has indicated that for human _____, vocal pitch changes may be associated with fertility
a. males b. females c. males and females d. females during menopause e. males during puberty
In order to synthesize proteins, a virus with a genome comprised of single-stranded negative-sense RNA
A. must use its negative-sense strand as a template to make a positive-sense RNA. B. must use DNA polymerase to make a positive-sense DNA strand first. C. must use reverse transcriptase to make a negative-sense DNA strand first. D. can directly translate its negative-sense RNA strand into proteins.
In generalized transduction, a phage introduces a segment of donor DNA into the recipient cell. This is followed by recombination of the donor fragment with the recipient chromosome. Which of the following must occur?
A) circularization of the donor fragment before recombination B) a pair (or even number) of crossovers between the donor segment and the recipient C) degradation of one of the two strands of phage genome D) replication of the donor segment before recombination E) a single crossover between the donor segment and the recipient chromosome
The thyroid gland is located
A. in the brain. B. in the neck. C. near the ovaries or testes. D. on top of the kidneys. E. near the small intestines.