Which of the following is NOT involved in the regulation of the lac operon?
A. an inducer
B. a repressor protein
C. an miRNA
D. glucose
E. cyclic AMP
Answer: C
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Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
A) lytic phages B) proviruses C) viroids D) bacteriophages E) retroviruses
In ________, ribosomes can attach to the mRNA and begin translation even though transcription has not been completed.
A. fungi B. prokaryotes C. protozoa and some plants D. eukaryotes
The HIV virus can take over much of the cell's machinery to produce many copies of the virus. Two classes of drugs that have been effective against HIV are base analogs (e.g., AZT) and protease inhibitors. How do these work to slow or stop HIV replication? What other steps in the HIV life cycle might be targets for drug development? What else can be done to try to stop the spread of HIV?
What will be an ideal response?
When the polymerase chain reaction (PCR) is used to amplify segments of DNA, the sample is first heated, and then cooled, in cycles. How many cycles of heating and cooling would be necessary to produce 16 times the original quantity of DNA?
a. 16 b. 2 c. 4 d. 6 e. 8