Which of the following best describes the main structural components of a virus?
a) nucleic acid and enzymes
b) prophage and nucleic acid
c) nucleic acid and protein capsid
d) protein capsid and enzymes
e) prophage and protein capsid
Ans: c) nucleic acid and protein capsid
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The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia. This is probably an example of _____
A. gene flow. B. sexual selection. C. directional selection. D. founder effect. E. disruptive selection.
Which of the following is the best description of algae?
A. a heterotrophic protist B. a chemotrophic protist C. a heterotrophic prokaryote D. a chemotrophic prokaryote E. a photosynthetic protist
To conserve water, desert plants may have leaves that are reduced are entirely absent in which case a plant stems can perform photosynthesis
a. true b. false
Under the island model of migration, allele frequencies will not be in Hardy–Weinberg equilibrium in the is-land population unless:
What will be an ideal response?