A fish circulatory system is indicated by
a. A.
b. B.
c. C.
d. both A and B.
e. none of these
A
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Anoxygenic phototrophs
A) may use a variety of electron donors for photosynthesis. B) are an ancient monophyletic group of bacteria. C) can be either autotrophic or heterotrophic. D) can be either autotrophic or heterotrophic and may use a variety of electron donors for photosynthesis.
Specific types of lipids assemble into defined areas of a biological membrane referred to as:
A. sphingopatches. B. lipid rafts. C. biomembrane aggregation regions (BARs). D. plaques. E. cholesterol plugs.
For two genes that show independent assortment, what is the frequency of recombination?
A. 100% B. 75% C. 50% D. 25% E. 0%
The individuals responsible for constructing the first model of DNA structure were
a. Wallace and Watson. b. Lamarck and Darwin. c. Mendel and Meischer. d. Crick and Watson.