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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology