26. Prokaryotes

Why is salt a good preservative to use for foods such as pork and fish?

Plasmids __________.

How is it possible that as many as 9 million mutations can arise each day in the population of E. coli inhabiting one human?

In the absence of meiosis and sexual reproduction, what general process allows genetic recombination among prokaryotes?

Which of the following statements about transformation is true?

An F⁺ bacterial cell __________.

Which of the following is/are true about R plasmids?

Genetic variation in bacterial populations cannot result from a. transduction. b. conjugation. c. mutation. d. meiosis.

What has metagenomic analysis allowed researchers to do for the first time? a. sample organisms from an environment and grow them under defined conditions in the lab b. isolate organisms from an environment and sequence their entire genome c. study organisms that cannot be cultured (grown in the lab) d. identify important morphological differences among species

What has metagenomic analysis allowed researchers to do for the first time? a. sample organisms from an environment and grow them under defined conditions in the lab b. isolate organisms from an environment and sequence their entire genome c. study organisms that cannot be cultured (grown in the lab) d. identify important morphological differences among species

Bacteria are able to divide on a faster schedule than eukaryotic cells. Some bacteria can divide every 20 minutes, while the minimum time required by eukaryotic cells in a rapidly developing embryo is about once per hour, and most cells divide much less often than that. State at least two testable hypotheses explaining why bacteria can divide at a faster rate than eukaryotic cells.