Biology Chapter 14

Which of the steps of bacterial reproduction occurs first?

DNA is replicated.

MRSA is caused by:

a drug-resistant form of Staphylococcus aureus.

Beta-lactam antibiotics interfere with bacteria's ability to synthesize:

cell walls

If you carry staph of any strain but aren't sick, you are:

colonized.

The evolution of antibiotic resistance is an example of:

directional selection.

A type of natural selection in which organisms with phenotypes at both extremes of the phenotypic range are favored by the environment is:

diversifying selection.

A highly resistant antibiotic strain of S. aureus would reproduce:

equally in the presence or absence of antibiotic.

The relative ability of an organism to survive and reproduce in a particular environment is known as:

fitness

Bacteria can become resistant to drugs by:

mutations and acquiring "resistance genes."

Bacterial can acquire new genetic variation by:

mutations, acquiring new alleles, and gene transfer.

The most severe disease that can result from MRSA is:

necrotizing fasciitis.

If the cell wall of Staphylococcus aureus fails to form properly, water will enter the cell by the process of _____.

osmosis

Which of the following is the drug of choice when a serious MRSA infection is present?

vancomyosin

Antibiotic-resistant bacteria have _____ fitness in the presence of antibiotics.

very high