Phage T4 protects its DNA from cleavage by host restriction enzymes by
A. inactivating restriction enzymes.
B. replicating very rapidly.
C. substituting glucosylated hydroxymethylcytosine for cytosine.
D. methylating bases.
Answer: C
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What information is used by the ribosome to assemble the amino acid sequence of a polypeptide?
A) Base sequence of mRNA B) Base sequence of DNA C) Base sequence of tRNA D) Base sequence of the chromosome
Which has an unusual characteristic in that their circular DNA does not have genes for making the proteins needed to
replicate and produce new viruses? a. viroid b. retroviruses c. bacteriophages d. pandoraviruses e. polydnaviruses
A number of different phylogenies (evolutionary tress) have been proposed by scientists. These phylogenies are useful because they can be used to
A. determine when two similar populations of a species evolved into two separate species B. Evaluate which groups of organisms may be most closely related C. demonstrate that all photosynthetic organisms are members of the Kingdom Plantae D. demonstrate that natural selection is the prevailing force in evolution E. demonstrate which taxa (groups of organisms) contain the most highly evolved species
Some protists use multiple fission (cell division preceded by several nuclear divisions) as a means of reproduction. Multiple fission is also referred to as
A. budding. B. syngamy. C. intermediary meiosis. D. schizogony. E. zygotic meiosis.