During the infection cycle for a typical retrovirus, such as HIV, which uses RNA as genetic material, the genetic variation in the resulting population of new virus particles is very high because of
(A) damage to the virus particle from envelope loss during infection
(B) errors introduced in the DNA molecule through reverse transcription
(C) errors in the protein molecules produced in translation
(D) recombination of the genomes of free virus particles
Ans: (B) errors introduced in the DNA molecule through reverse transcription
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generate cDNA libraries for the same cell line under different conditions. When I compare the
libraries, I find some cDNAs in one library that are missing from the other. What is the best explanation for this result?
a. One of the cDNA libraries is really a genomic library. b. Even the same cell type will change gene expression as conditions change. The difference in cDNAs tells me which genes are expressed in each set of conditions. c. There was an error in generating one of the cDNA libraries and some of the sequences were not cloned properly. d. The probe I used in the Southern blot of the libraries must have been poorly constructed. e. There is no explanation other than experimental error.
Wheat stem rust fungus is a(n) _____
a. obligate plant parasite b. mycorrhizal fungus c. decomposer d. pathogenic chytrid e. photosynthetic
Which biome has the longest growing season?
a. tundra b. taiga c. grassland d. temperate deciduous forest e. tropical rain forest
All of the following statements concerning the theory of continental drift are true EXCEPT
A. the coastlines of several continents are mirror images. B. continental drift has ceased. C. similar geological structures are found in areas where the continents touched. D. the unique distribution patterns of several fossils is explained by continental drift.