Why is methicillin-resistant staphylococcus aureus (mrsa) methicillin resistant?

a. it produces a modified penicillin binding protein (pbp) target molecule that is not effectively inhibited by the drug.
b. it actively pumps the antibiotic out of the cell.
c. the bacteria are able to prevent entry of the drug into the cell.
d. it has an enzyme that destroys methicillin.

A

Explanation:

It produces a modified version of the molecule that is targeted by the drug i.e  It produces a modified penicillin binding protein (PBP) target molecule that is not effectively inhibited by the drug.

it is b

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c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."