Following unprotected sex with a guy you met at a party, you are now worried about what you might have been exposed to during this episode. Ten days later, you talk to your doctor about getting an HIV test. What is the doctor's response?
A. HIV infection can be latent and asymptomatic for years, so testing should be postponed until you exhibit symptoms of AIDS.
B. It's too soon to detect the antibody produced by your immune system in response to HIV exposure, so a test will come back negative. Wait a few more weeks to be tested.
C. The incidence of HIV infection in the United States is at an all-time low level, so transmission was not at all likely, especially after only a single possible exposure.
D. The antibiotic that you have been taking for a urinary tract infection will also destroy HIV, so you don't have to worry about an infection.
Answer: B
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In the lac operon, what occurs in the presence of lactose?
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