Within eukaryotic genes are sections of information called ________ that will be removed from the RNA strand prior to it leaving the nucleus
a. introns and exons
b. introns
c. promoter sequences
d. exons
e. RNA polymerases
b
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The ____ absorb nutrients through their plasma membranes and lack food vacuoles
a. golden algae b. apicomplexans c. dinoflagellates d. diatoms e. red algae
What is believed to have brought on the mass extinction at the end of the Cretaceous period that ceded dominance of the land from dinosaurs to mammals?
a. disease epidemic b. volcanic eruptions c. asteroid impact d. genetic defect
Conjugation between a bacterium that lacks an F factor (F?) and a bacterium that has an F factor on its chromosome (F+) could produce which of the following results?
A) The F? bacterium ends up carrying one or more plasmids from the F+ bacterium; the F+ bacterium is unchanged. B) The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F? bacterium, and the F? bacterium ends up with an unaltered chromosome. C) The F+ bacterium ends up with a recombinant chromosome that carries some genes from the F? bacterium, and the F? bacterium ends up with a chromosome that lacks those genes. D) The F? bacterium ends up with a recombinant chromosome that carries some genes from the F+ bacterium, and the F+ bacterium ends up with an unaltered chromosome.
Natural selection tends to correlate the structures of a nervous system with an animal's function within the environment. A good example is sessile or slow-moving molluscs such as clams, which
A) have little or no cephalization and simple sense organs. B) use chemical synapses to process complex information. C) have a well-developed brain that functions as a master control center. D) use their circulatory system as a mechanism for distributing nerve impulses.