Over the past several decades, populations of Staphylococcus aureus (a type of bacteria that infects wounds) have become resistant to penicillin
You run the following experiment:
Reference: Ref 14-1
In a different set of experiments, you identify two kinds of mutations in S. aureus. The first
type of mutation makes the bacteria more susceptible to antibiotic X; the second type of
mutation makes it more resistant to antibiotic X. Which type of mutation is more likely to
occur in the population?
A. the first type (more susceptible)
B. the second type (more resistant)
C. It depends if the cell population has been
exposed to antibiotic X.
D. It depends if either type of mutation
confers additional survival benefits to S.
aureus.
E. There is no difference in likelihood
because the mutation is a random event.
E
You might also like to view...
Petals
A. protect the developing flower. B. enclose and protect the ovule. C. produce pollen. D. are part of the gametophyte. E. attract pollinators.
Temperate deciduous forests generally have ____ annual precipitation levels and ____ temperatures than boreal forests
a. higher; higher b. the same; lower c. the same; higher d. lower; lower e. lower; the same
In plant cells, the first sign of cytokinesis is the formation of a cell plate instead of a cleavage furrow. The cell plate is formed because plant cells
A. have a cell wall. B. don't divide after mitosis, but become one larger cell with multiple nuclei. C. have a nucleus. D. don't have a cell membrane. E. All of the answer choices are correct.
Plant cells often have a large membrane-bound sac that is used for storing water and other substances. This organelle is called:
A. centriole B. chloroplast C. nucleus D. central vacuole E. Golgi body