Explain how using a combination of two antimicrobial drugs helps prevent the development of spontaneously resistant mutants
A. All drugs work synergistically with each other-that is, their combined effects are far greater than either could achieve individually. Two drugs together helps to eliminate microbes, even if they have developed spontaneous mutations that would confer upon them resistance to the drugs.
B.
It is highly unlikely that the microbe might spontaneously develop two specific mutations to resist the effects of a pair of drugs. As such, even if one drug is resisted by the microbe, the second drug will eliminate the mutated microbe, thus preventing the development of spontaneously resistant mutants overall.
C. All drugs work antagonistically with each other-that is, their combined effects are far greater than either could achieve individually. Two drugs together helps to eliminate microbes, even if they have developed spontaneous mutations that would confer upon them resistance to the drugs.
D. Drugs can also select for mutations that will enhance the activity of another drug. So, each of the paired drugs will help to select for spontaneous mutations that enhance the activity of the other drug in the pair.
B
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Which of the following mechanisms of posttranscriptional regulation of gene expression can produce several different proteins from a single gene?
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You have a series of cells, some of which are cancerous. How might you determine which cells are cancerous?
A. Identify the cells that are not dividing uncontrollably. B. Identify the cells that have increased rates of cell death. C. Identify the cells with abnormal chromosome number or structure. D. Identify the cells that utilize Ras protein for growth inhibitory signals.
FRAP has revealed that some proteins movement is restricted in cell membranes much more than in artificial bilayers. Which of the following could account for limited mobility of proteins in cell plasma membranes?
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