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?
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. To date, no effective vaccines have been developed.
The most effective preventative to date is education on safe sex practices.
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Allosteric inhibitors are often ____
a. substrates of the reactions they regulate b. products of the reactions that they regulate c. charged amino acids in the active site d. large, complex organic molecules e. competitive inhibitors
Seed-producing plants first evolved ____
a. on land b. in freshwater c. in the ocean d. in estuaries e. from red algae ancestors.
In animal cells, oxidation of very long fatty acids occurs in
A) mitochondria. B) peroxisomes. C) lysosomes. D) the smooth endoplasmic reticulum. E) residual bodies.
Which of the following statements regarding an atom with high electronegativity is true?
a. It will have fewer protons than an atom with low electronegativity. b. It will have a tendency not to attract electrons. c. It will most likely be located on the left-most side of the periodic table of elements. d. None of these choices are correct. e. All of these choices are correct.