Which of the following vectors would be most efficient to use to amplify fragments ~300 kb in length?
A) BACs
B) plasmids
C) YACs
D) phage
E) cosmids
C
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Which of the following statements about the concept of an ecological footprint is false?
A. Countries with the largest population sizes have the largest ecological footprints. B. It is an estimate of how much land is required to provide the resources used by an individual. C. The total ecological footprint for humanity is greater than the actual surface area of Earth. D. It encompasses the energy used to produce goods AND the energy used to ship those goods to a store. E. Undeveloped countries have smaller ecological footprints than developed countries.
Why do living organisms have the potential for errors (mutations and/or variations) in their development?
a. so that organisms may contribute to evolution b. so that organisms may live unchanged c. so that organisms may die unchanged d. so that organisms may contribute to reproduction
A population's environment sometimes changes too quickly for natural selection to adapt the individuals in the population to the environment. In these situations:
a) the rate of somatic mutations increases. b) the individuals' instincts can no longer be trusted to elicit behavior that maximizes reproductive success. c) evolution ceases to operate in the population. d) mutation occurs so that extinction will not occur. e) disruptive selection will occur.
Cnidocytes are found in _____.
a) phylum Porifera b) phylum Nemertea c) phylum Nematoda d) phylum Cnidaria