The reason for The growth of mutant bacteria Which are antibiotic resistant is b

Question

The reason for The growth of mutant bacteria Which are antibiotic resistant is because
A) The survival of sensitive cell population in the presence of a high concentration of antibiotic C) A mutation that allows the cell to grow only in the presence of streptomycin D) The selection for a mutation which is lethal to the cell The reason for The growth of mutant bacteria Which are antibiotic resistant is because
A) The survival of sensitive cell population in the presence of a high concentration of antibiotic C) A mutation that allows the cell to grow only in the presence of streptomycin D) The selection for a mutation which is lethal to the cell The reason for The growth of mutant bacteria Which are antibiotic resistant is because
A) The survival of sensitive cell population in the presence of a high concentration of antibiotic C) A mutation that allows the cell to grow only in the presence of streptomycin D) The selection for a mutation which is lethal to the cell

Explanation / Answer

(C) A mutation that allows the cell to grow only in the presence of streptomycin

Reason:

Mutant bacteria usually do not grow as well as the wild-type bacteria because most changes are harmful, or at least not helpful. If, however, conditions change in the environment and favor a mutant cell, it will be able to out-compete and outgrow the cells that do not have the advantageous mutation.

Antibiotics kill or inhibit bacteria by interfering with essential processes such as protein synthesis, cell wall synthesis, and DNA replication. Streptomycin kills bacteria by binding to the bacterial 70S ribosome to prevent protein synthesis.Escherichia coli that are sensitive to streptomycin can become resistant with just one mutation. This mutation alters the ribosome so that streptomycin can no longer bind to it, however the mutation does not alter the normal function of the ribosome. In the presence of streptomycin, bacteria that have this mutation will most likely survive and grow, whereas those without the mutation will die.

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