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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology