Choanoflagellates are most closely related to the ____
a. land plants
b. animals
c. mold
d. bacteria
e. slime molds
ANSWER: b
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The exchange of a purine-pyrimidine base pair for the other purine-pyrimidine pair is:
A. a silent mutation. B. a transition mutation. C. a frameshift mutation. D. a nonsense mutation. E. a transversion mutation.
What distinguishes expression vectors from other cloning vectors?
a. Expression vectors do not have an origin of replication. b. Only expression vectors have origins of replication. c. Expression vectors contain regulatory sequences to allow transcription and translation of an inserted gene. d. Inserted genes cannot be transcribed from an expression vector. e. Expression vectors do not contain antibiotic resistance genes.
A population of mountain-dwelling salamanders migrates and splits into two populations separated by a valley they can not cross. The speciation process that may occur is:
A) temporal. B) sympatric. C) behavioral. D) allopatric.
What are attributes of oral contraceptives? (Check all that apply.)A) They contain a progesterone and sometimes an estrogen analogue.B) The progesterone is in the 21-day pills, and the estrogen is in the 7-day pills.C) They help protect against ovarian and endometrial cancer.D) They are appropriate for use by smokers over age 35.E) They have a low failure rate of only 1% to 5% a year.F) They act by inhibiting LH and FSH secretion, inhibiting ovulation.
What will be an ideal response?