Genetic drift will have a progressively larger impact on allele frequencies in a population as ____
a. gene flow increases
b. population size decreases
c. mutation rate decreases
d. population size increases
e. random mating increases
ANSWER: b
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Which of the following is NOT a form of passive
transport? a. osmosis b. facilitated diffusion c. simple diffusion d. exocytosis e. none of these
Areas of the spinal cord appear glistening white
because of a. naked dendrites. b. cell bodies. c. axon endings. d. lack of meninges. e. myelin sheaths of axons.
Which one of the following is the main reason that a typical eukaryotic gene is able to respond to a far greater variety of regulatory signals than a typical prokaryotic gene or operon?
(a) Eukaryotes have three types of RNA polymerase. (b) Eukaryotic RNA polymerases require general transcription factors. (c) The transcription of a eukaryotic gene can be influenced by proteins that bind far from the promoter. (d) Prokaryotic genes are packaged into nucleosomes.
The K-T boundary is a layer present in strata worldwide that marks the boundary between the ________ periods, when ________
a. Proterozoic-Cambrian / oxygen accumulated in the atmosphere b. Cretaceous-Tertiary / an asteroid impact caused the extinction of the dinosaurs c. Triassic-Jurassic / dinosaurs appeared d. Devonian-Carboniferous / land tetrapods appeared