Why has finding an effective AIDS vaccine been so difficult?
A. Because it is caused by a virus.
B. Because they have not yet isolated the virus that causes AIDS.
C. Because the virus constantly mutates and so vaccines need to be made for all types.
D. It is a sexually transmitted virus.
E. The body does not make antibodies against the virus.
Answer: C
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Nitrogen can be obtained from either organic or inorganic sources.
Answer the following statement true (T) or false (F)
Using the analogy of a 12-hour geologic time clock
a. prokaryotes appear shortly after 5 a.m. b. eukaryotes appear at 9 a.m. c. dinosaurs appear at 10 a.m. d. early fishes appear at 11 a.m. e. the first humans appear at 11:59 a.m.
If a lion eats a gazelle, before the molecules have been broken down by its cells, the lion has gained
What will be an ideal response?
Viral neutralization testing is based on the fact that
A. antibodies can be produced against the toxin of a pathogen. B. antibodies have different molecular weights. C. viruses introduced into appropriate cell cultures have a cytopathic effect. D. the gene for a pathogen's antigen can be isolated and introduced into a host cell by way of a plasmid. E. antibodies to certain microbes can be given a fluorescent label.