A species has 29% of its DNA composed of the nucleotide containing guanine (G). What percent does the nitrogen base thymine (T) equal?
A. 42%
B. 29%
C. 58%
D. 21%
E. 67%
Answer: D
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Which of the following conditions would you use to enrich purple nonsulfur bacteria from lake sediments?
A) anoxic media with a good light source B) mineral media with ammonia and oxygen in the dark C) anoxic mineral media with an organic acid and a good light source D) mineral media with nitrate and acetate in the dark
The best explanation for why a mouse develops into a mouse and not a human is
A. most of the coding genes are different. B. most of the non-coding genes are different. C. gene expression differs. D. the genes are mostly the same but have been rearranged. E. synteny has not been conserved.
Below are figures for the percentage allocation of production to shoots (above-ground parts) for four different species. Which of these is likely to be an annual herbaceous species?
A) 80-90% B) 70-80% C) 60-70% D) 20-60%
All of the following are advantages of attenuated vaccines over inactivated vaccines except
A. they produce infection but not disease. B. they can mutate back to a virulent strain. C. they require smaller doses. D. they confer longer lasting protection. E. they require fewer boosters.