Which part of the cardiac conduction system fires off impulses at the fastest rate?
a. Purkinje fibers
b. Bundle branches
c. AV node
d. SA node
e. gap junctions
ANSWER: d
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Discuss how two of the following alter allele frequencies in populations: nonrandom mating, genetic
drift, gene flow, and natural selection. What will be an ideal response?
If you (incorrectly) proposed that tundra, the world's largest land biome, contains high species richness, your proposal would be consistent with the
A. species-time hypothesis. B. species-area hypothesis. C. species-productivity hypothesis. D. diversity-stability hypothesis.
For two types of organisms to belong to the same species, they must
A. look alike. B. live in the same geographic region. C. be able to naturally produce fertile offspring. D. contain the same gene frequencies.
Which type of lipid is composed of long-chain fatty acids attached to long-chain alcohols?
A. Triglycerides B. Phospholipids C. Sterols D. Waxes E. Most neutral fats