What is the structure being described? b. What is the chemical composition of this structure? c. What is the function of the structure, and how does it benefit the bacteria?

In Experiment I, you established that beneficial mutations are rare. In Experiment II, you showed that the environment does not affect the probability of a beneficial mutation occurring. Knowing this, why then are mutations responsible for antibiotic resistance in bacteria so common?

The unicellular, rod-shaped bacterium E. coli is~2 μm long and 0.8 μm wide, and has a genomeconsisting of a single 4.6 Mb circular DNA molecule. The unicellular archaean Methanosarcinaacetivorans is spherical (coccus-shaped) with adiameter of 3 μm and has a 5.7 Mb circular genome.The unicellular eukaryote Saccharomyces cerevisiaeis roughly spherical, with a diameter of 5–10 μm.It has a haploid genome of 12 Mb divided among16 linear chromosomes. Given these descriptions,how could you determine whether a new, uncharacterized microorganism was a bacterium, an archaean,or a eukaryote?

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