Answer to Question 1
ANS: C
The ACS recommends 150 minutes of moderate exercise weekly, which comes to around 20 minutes a day.
Answer to Question 2
ANS: B
The individual's blood is tested with ELISA or enzyme immunoassay (ELA), antibody tests that detect the presence of HIV antibodies. If the ELA is positive for HIV, then the same blood is tested a second time. If the second ELA is positive, a more specific confirming test such as the Western blot is done. Blood that is reactive or positive in all three steps is reported to be HIV-positive. A seronegative is not an assurance that the individual is free of infection since seroconversion may not have yet occurred.