A layer of membrane attached to a virus is called
a. an envelope.
b. a protein coat.
c. a chromosome.
d. a plasmid.
e. a nucleus
Answer: a. an envelope.
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A certain female's number 12 chromosomes both have the blue gene and number 19 chromosomes both have the long gene. As cells in her ovaries undergo meiosis, her resulting eggs (ova) may have which of the following?
A) either two number 12 chromosomes with blue genes or two with orange genes B) either two number 19 chromosomes with long genes or two with short genes C) either one blue or one orange gene in addition to either one long or one short gene D) one chromosome 12 with one blue gene and one chromosome 19 with one long gene
Industrial smog in cold, wet winters is what color?
a. red b. brown c. yellow d. black e. gray
Analogous traits:
a. are shared by two or more species because some evolutionary process (usually natural selec-tion) has independently fashioned the similar traits in each species. b. are found in two or more species because those traits are from a common ancestor. c. Both of the above. d. Neither of the above.
You have discovered an "Exo–" mutant form of DNA polymerase in which the 3?-to-5? exonuclease function has been destroyed but the ability to join nucleotides together is unchanged
Which of the following properties do you expect the mutant polymerase to have? (a) It will polymerize in both the 5?-to-3? direction and the 3?-to-5? direction. (b) It will polymerize more slowly than the normal Exo+ polymerase. (c) It will fall off the template more frequently than the normal Exo+ polymerase. (d) It will be more likely to generate mismatched base pairs.