Within six months of effectively using methicillin to treat S. aureus infections in a community, all new infections were caused by MRSA. How can this result best be explained?
A. The drug caused the S. aureus DNA to change.
B. Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.
C. In response to the drug, S. aureus began making drug-resistant versions of the protein targeted by the drug.
D. A patient must have become infected with MRSA from another community.
E. S. aureus can resist vaccines.
B. Some drug-resistant bacteria were present at the start of treatment, and natural selection increased their frequency.
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George Beadle and Edward Tatum used auxotrophs to determine their "one gene–one enzyme" hypothesis. An auxotroph is best described as:
A. a defective enzyme. B. a result of nondisjunction. C. a mutant unable to grow on minimal media. D. a wild-type version of a model organism. E. an organism with a dominant lethal mutation.
In order for successful antibiotic therapy, the in vivo level of the antibiotic must be greater than or equal to the MIC.
Answer the following statement true (T) or false (F)
Which of the following are made by biotechnology?
A. Insulin B. Bt toxin plants C. golden rice D. B & C only E. A, B, & C
Compare and contrast the lactose operon with the tryptophan operon
What will be an ideal response?