Neutral theory proposes that _____
A) molecular clocks are more reliable when the surrounding pH is close to 7.0
B) most mutations of highly conserved DNA sequences should have no functional effect
C) DNA is less susceptible to mutation when it codes for amino acid sequences whose side groups (or R-groups) have a neutral pH
D) a significant proportion of mutations are not acted upon by natural selection
D
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Before nitrogenous wastes are excreted in
urine, they are converted first to ___ and then to ___.
a. urea--ammonia b. ammonia--urea c. glycogen--monosaccharides d. glycerin--fatty acids e. glyerin--urea
Darwin was very interested in why animals on distant and isolated landmasses appear related to animals on the mainlands, yet were very distinct. Which of the following types of evidence would help Darwin make sense of his observations?
A. biochemical B. biogeographical C. fossil D. anatomical
Which is a description of cauterization?
a. treating a tumor with freezing temperatures b. treating tissue with heat c. drying tissue electrically d. surgical puncture to remove fluid e. removing cells by scraping the walls of an organ
In the first stage of a monohybrid experiment, two _____ are crossed.
A) parents phenotypically different for two traits B) individuals from the F1 generation C) homozygous parents differing in a trait controlled by one gene D) homozygous-dominant parents