Research on HIV vaccines is progressing, but success to date has been limited to vaccines that are of limited
effectiveness against a few strains of the HIV virus. However, flu vaccines are similar in their limitations. Why are
‘limited effectiveness flu vaccines released, but not HIV vaccines? What will be an ideal response?
ANSWER: There are two reasons. First, certain strains of flu tend to be more common in certain areas at
certain times, and this can be predicted to some level. Therefore the medical community can
release the vaccines more effectively. Second, and more important, contracting the flu is
difficult to prevent during regular activity and social interaction. Conversely, HIV
transmission requires levels of contact that can be controlled. As a result, it is still much safer
to use education to prevent the spread of HIV.
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Which of the boxes marked 1-4 correspond to plants with dark leaves?
A) 1 only B) 1 and 2 C) 2 and 3 D) 4 only E) 1, 2, and 3
The ____ is a web of hyphae produced by a fungus in response to encountering a food source
Fill in the blank with the appropriate word.
Incompatibility in the Rh blood system can result in hemolytic disease of the newborn. Which combination poses the greatest risk?
a. Rh positive mother, Rh negative fetus b. Rh positive father, Rh negative fetus c. Rh negative mother, Rh positive fetus d. Rh negative mother, Rh negative fetus e. Rh positive mother, Rh negative father
Which of the following is NOT a characteristic of all living organisms?
a. adaptation to their environment b. reproduction c. response to stimuli d. multicellularity e. metabolism