Prezygotic mechanisms lead to reproductive isolation by preventing the formation of
A. hybrid zygotes.
B. mating pairs.
C. fertile sperm or pollen cells.
D. somatic cells.
E. fertile eggs.
Answer: A
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Which of the following is common to both factor-dependent and factor-independent transcription termination?
A. Both types of termination involve NusA protein. B. Both types of termination are associated with rho termination factor. C. Both types of termination occur following a pause by the polymerase. D. None of the above are correct.
How many layers does the plasma membrane contain?
a. 1 b. 2 c. 3 d. 4
Freshwater fish must excrete ______ and actively accumulate _______
a. water; urea b. urea; water c. salt; urea d. water; salt e. urea; water
If a pure-breeding long-tail cat (LL) is crossed with a
pure-breeding cat with no tail (rumpy, ll), and a cat with a short tail (stumpy) is produced, the simplest explanation is a. a mutation. b. an X-linked gene. c. an incompletely dominant gene. d. a lethal gene. e. chromosomal aberration.