Replication of DNA is
A. conservative.
B. redundant.
C. dispersive.
D. semiconservative.
E. semidispersive.
D. semiconservative.
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Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon. B. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon. C. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon. D. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon.
A woman goes to the doctor and is diagnosed as having rheumatoid arthritis. What factors led to her development of this disease? Select all correct choices
A. Some of her T cells were not positively selected. B. Some of her T cells were not negatively selected. C. Some of her T cells are recognizing and responding to her normal self antigens. D. Some of her T cells are not recognizing and associating with her MHC proteins.
La Selva Biological Station and the Braulio Carrillo National Park in Costa Rica are an example of
A) use of corridor theory in guiding conservation. B) use of metapopulation dynamics in guiding conservation. C) use of island biogeography theory in guiding conservation. D) poor planning in conservation efforts.
The biological species concept by Ernst Mayr defines a species in the textbook as a group of interbreeding natural populations reproductively isolated from other such groups. However, such a definition cannot be used for
A. fossils. B. asexual organisms. C. determining species based on dead or preserved specimens. D. organisms that cannot be raised in captivity, easily bred, or with very long generation times. E. All of the situations pose problems for the biological species concept.