Most of the world's deserts are located at latitudes where
A) hot, dry air moving toward the equator rises.
B) hot, dry air moving toward the poles rises.
C) cold, dry air moving toward the poles descends.
D) cold, dry air moving toward the equator descends.
Answer: C
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If autopolyploidy is responsible for the formation of a tetraploid grape (with extra-large fruit) from a diploid population (with smaller fruit), which of the following events must have occurred?
A. Mating of diploid individuals to individuals from a different species of grape B. Doubling of chromosome number in the diploid population C. Halving of chromosome number in the diploid population D. A point mutation that produces extra-large fruit
Two species mate but their offspring die before reaching adulthood. A more efficient way to prevent interbreeding would be to have incompatible genitals.
a. true b. false
Which of the following is true of chemokines?
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