__________ is the heritable variation among individuals of a single population or within the species as a whole?
A. extirpation
B. genetic diversity
C. natural selection
D. species diversity
E. coevolution
Answer: B. genetic diversity
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Based on what you know about eukaryotic cells, what is one of the arguments against using RNA as the genetic storage molecule?
A. Because RNA uses uracil instead of thymine, it cannot hold genetic information. B. RNA has a negatively charged sugar phosphate backbone. C. The structure of RNA does not allow for double-stranded base pairing. D. There is no current mechanism to package enough RNA to encode all the information needed by the cell. E. The secondary structure of RNA prevents its replication before cell division.
The rate of exchange of carbon between the atmosphere and the oceans represents a carbon:
A. sink. B. reservoir. C. biomass. D. precipitation. E. flux.
Allen's rule states that mammals from colder climates have shorter ears and appendages than individuals of the same species from warmer areas. The related Bergman's rule states that mammal body size varies with latitude, with larger body size in populations located closer to the poles and smaller body size in populations located closer to the equator. What can explain both of these rules?
A. Larger bodies can store proportionally more fat as insulation than smaller bodies. B. Smaller bodies can store proportionally more fat as insulation than larger bodies. C. Heat loss increases as the surface area to volume ratio of the animal increases. D. Larger bodies have a proportionally larger surface area, and heat radiation varies with volume. E. Smaller bodies have a proportionally smaller surface area, and heat radiation increases with surface area.
____ and ____ that enter Bowman's capsule are reabsorbed
a. Water; urine b. Starches; amino acids c. Amino acids; proteins d. Glucose; amino acids e. Glucose; proteins