Use the information in the following paragraph to answer the next few questions.
A hypothetical bacterium swims among human intestinal contents until it finds a suitable location on the intestinal lining. It adheres to the intestinal lining using a feature that also protects it from phagocytes, bacteriophages, and dehydration. Fecal matter from a human in whose intestine this bacterium lives can spread the bacterium, even after being mixed with water and boiled. The bacterium is not susceptible to the penicillin family of antibiotics. It contains no plasmids and relatively little peptidoglycan.
-Some of the proteins that allow this bacterium to swim are related (in an evolutionary sense) to proteins that
A) attach to the single chromosome.
B) act as restriction enzymes.
C) synthesize peptidoglycan for the cell wall.
D) move macromolecules out of the cell.
E) comprise its ribosomes.

Question

Quizplus · Accepted Answer

The paragraph does not mention anything about proteins that attach to the chromosome, act as restriction enzymes, or synthesize peptidoglycan. However, it does mention that the bacterium contains relatively little peptidoglycan and no plasmids, suggesting that it does not rely heavily on cell wall synthesis or horizontal gene transfer. The paragraph does mention that the bacterium swims, which suggests a role for proteins that move macromolecules out of the cell, such as flagella proteins. Therefore, choice D is the best option. The paragraph does not provide any information about the ribosomes of this bacterium.

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