In a population of bacteria, about 25 percent of the population has resistance to the antibiotic
penicillin. After a few days, 50 percent of the population has the resistant gene. Assume the
population did not simply reproduce. How might this antibiotic resistance have spread in the
population?
a. The gene for antibiotic resistance is found in plasmids, which can be transferred between
bacteria.
b. Bacteria are able to swap genes between their nucleoid and plasmids.
c. The antibiotic must have been introduced into the population, which then evolved by
natural selection.
d. Genetic material in the nucleoid is shared among the population of bacteria.
A
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Indicate whether the statement is true or false.
An adaptation in one environment may be useless or harmful in different circulstances.
a. true b. false
Suppose you observe a tissue with one free surface and with several layers of cells attached to a basal lamina. What type of tissue is this an example of?
a. epithelial tissue b. muscle tissue c. connective tissue d. nervous tissue
Normal genes have a promoter followed by a start codon. In a mutant gene, the "A" in the start codon has been deleted. Which of the following is not a possible outcome?
A) The normal protein will be produced. B) A shorter protein will be produced. C) A longer protein will be produced. D) No protein will be produced.