The donor cell makes ___________ whose function is to bring F- cells close enough to transfer a ___________ to the recipient.
A. a sex pilus, single strand of DNA
B. a sex pilus, double strand of DNA
C. an F factor, fertility plasmid
D. an F factor, replicated F factor
E. a sex pilus, bacterial chromosome
A. a sex pilus, single strand of DNA
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RNA molecules that have catalytic activity are known as ________.
Fill in the blank(s) with the appropriate word(s).
Vast __________ form in the interior of midlatitude
continents. Fill in the blank(s) with the appropriate word(s).
Laboratory experiments about bacterial mutation rates have demonstrated which of the following?
A) Bacterial mutation rates rarely evolve in short-term laboratory experiments; they are a relatively fixed feature of a species biology. B) In short-term laboratory experiments, bacterial mutation rates often evolve to be higher because higher mutation rates result in higher fitness. C) In short-term laboratory experiments, bacterial mutation rates often evolve to be lower because mutations are typically deleterious for organisms. D) Depending on the experiment, bacterial mutation rates sometimes evolve to higher rates, and other times evolve to lower rates.
Ribosomes that do not anchor on the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the surface. C) have a signal peptidase error. D) do not make the appropriate anchor protein. E) All of the above are probable reasons.