Researchers discovered that a new strain of bacteria that cause tuberculosis (M. tuberculosis) taken from a dead patient has a point mutation in the rpoB gene that codes for part of the RNA polymerase enzyme

This mutant form of RNA polymerase does not function as well as the more common form of RNA polymerase. A commonly used antibiotic called rifampin does not affect the mutant rpoB bacteria. A researcher mixes M. tuberculosis with and without the rpoB mutation and adds the bacteria to cell cultures. Half the cell cultures contain only standard nutrients, while the other half of the cell cultures contain rifampin and the standard nutrients. After many cell generations, the researcher finds that _____. A) very few M. tuberculosis in the standard nutrient cell cultures carry the rpoB gene mutation, but almost all of the M. tuberculosis in the cell cultures with rifampin carry the rpoB mutation
B) almost all M. tuberculosis in the standard nutrient cell cultures carry the rpoB gene mutation, but very few of the M. tuberculosis in the cell cultures with rifampin carry the rpoB mutation
C) very few M. tuberculosis in any of the cell cultures carry the rpoB gene mutation
D) almost all of the M. tuberculosis in both types of cell cultures carry the rpoB mutation


A

Biology & Microbiology

You might also like to view...

During which phase does the corpus luteum form?

a. menstrual b. progestational c. proliferative d. ovulatory e. pregnancy

Biology & Microbiology

2-amino-purine is a mutagenic chemical whose structure closely resembles that of adenine. It would

therefore be A. a base analog that causes substitution mutations. B. a base analog that causes frameshift mutations. C. an intercalating agent that causes substitution mutations. D. an intercalating agent that causes frameshift mutations. E. It could act in any of these ways.

Biology & Microbiology

Home gardeners who grow tomatoes are often told to pinch off axillary buds at nodes to prevent the plants from becoming too bushy. This is consistent with most tomato plants being which of the following?

A. monocots B. determinate C. eudicots D. indeterminate

Biology & Microbiology

Organisms that require organic sources of carbon and energy are called (autotrophs /chemoautotrophs/chemoheterotrophs /).

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology