The first class of drugs developed to treat AIDS, such as AZT, were known as reverse transcriptase inhibitors. They worked because they _____
A) targeted and destroyed the viral genome before it could be reverse transcribed into DNA
B) bonded to the dsDNA genome of the virus in such a way that it could not separate for replication to occur
C) bonded to the viral reverse transcriptase enzyme, thus preventing the virus from making a DNA copy of its RNA genome
D) prevented host cells from producing the enzymes used by the virus to replicate its genome
C
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A friend of yours calls to say that his car would not start this morning. He asks for your help. You say that you think the battery must be dead. If so, then jump-starting the car from a good battery will solve the problem. In doing so, you are _____
A) testing a theory for why the car will not start B) making observations to inspire a theory for why the car will not start C) stating a hypothesis and using that hypothesis to make a testable prediction D) comparing multiple hypotheses for why the car will not start
Which category had the highest amount of endangered species in 2012?
a. amphibians b. insects c. mammals d. plants
U.S. health officials are considering different ways of preparing for a future worldwide epidemic of human influenza that could be derived from a form of the disease that infects birds (avian flu)
Which actions would be useful in preventing a future influenza epidemic? A) Inject helper T cells into healthy people to boost immune systems. B) Inoculate infected people with a vaccine against the pathogen. C) Give antibiotics to people with mild symptoms. D) Ask people with flu symptoms to stay at home.
What is the role of pyruvic acid in fermentation?
a. It becomes the final electron acceptor for the electron transport chain in the absence of oxygen. b. It takes the electrons from NADH, oxidizing it back into NAD+. c. It provides the protons to be used in the electron transport chain. d. It is the organic acid end-product of fermentation.