Of all the different codons that exist, three of them
a. are involved in mutations.
b. do not specify a particular amino acid.
c. cannot be copied.
d. do not specify a particular amino acid and are signals to begin translation.
e. do not specify a particular amino acid and are signals to terminate translation.
ANSWER: e
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Frequency-dependent selection acts to decrease the frequency of which phenotype in a population?
a. The least common phenotype
b. The most common phenotype c. The most conspicuous phenotype d. The most camouflaged phenotype e. The phenotype at an extreme of the normal distribution
Which were the first organisms to release oxygen by photosynthesis?
a. algae b. cyanobacteria c. gymnosperms d. flowering plants e. green sulfur bacteria
Which of the following statements about Hfr cells and bacterial conjugation is false?
A. An F' plasmid contains some bacterial genes. B. Cells with integrated F' plasmid have two copies of some genes. C. If excision of the F plasmid from an Hfr cell includes some bacterial genes, a partial diploid can result. D. The genes that are transferred from an Hfr cell into a recipient cell during conjugation replace the equivalent genes in the recipient cell. E. An Hfr cell becomes an F- cell if its integrated F plasmid is excised.
Radioactive isotopes are used in dating materials from the distant past. Which of the following statements about radioactive dating techniques is true?
A. It does not work well with fossil remains that have not absorbed radiation. B. It uses a technique in which the degree of radioactive decay is measured; the younger the rock the more radioactive decay. C. It gives exact ages of rock strata. (±1 year). D. It gives the general ages of rock strata. (±1 million years). E. It uses a technique in which the degree of radioactive decay is measured; the older the rock the more radioactive decay.