Question

Which three statements may correctly explain why the population size increases after time point C?a. Bacteria that acquired a mutation that conferred drug- resistance had a growth advantage over non-resistant bacteria.b. The population increase just after time point C indicates that antibiotic use was discontinued.c. Between time points C and D, drug-resistant bacteria were reproducing faster than non-drug resistant bacteria were dying.d. The few drug-resistant bacteria in the population reproduced, quickly leading to a large drug- resistant population.e. Because the population grew more rapidly after time point C, the bacteria must have acquired a second drug- resistance mutation.

Answer 1

Answer:

A,C, D

Explanation:

Bacteria that acquired a mutation that conferred drug- resistance had a growth advantage over non-resistant bacteria.

Between time points C and D, drug-resistant bacteria were reproducing faster than non-drug resistant bacteria were dying.

The few drug-resistant bacteria in the population reproduced, quickly leading to a large drug- resistant population.

There is no indication that a second antibiotic was used, so it is not possible to assume a second drug-resistance mutation occurred. There is also no indication that antibiotics were discontinued.