What is the tendency of water molecules to stick together?
A) cohesion
B) adhesion
C) tension
D) transpiration
A
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Which of the following scenarios leads to the highest level of lac operon expression?
A. high glucose levels, lactose absent B. low glucose levels, lactose absent C. high glucose levels, lactose present D. low glucose levels, lactose present
Which of the following is NOT true of prokaryotes?
A. They lack a membrane-bound nucleus. B. DNA is located within the cytosol. C. They have a simpler structure relative to eukaryotes. D. They possess membrane-bound organelles. E. They are relatively small compared with eukaryotes.
You are a NASA scientist and have discovered an organism in outer space that contains its genetic material in the cytoplasm rather than in a nucleus. Given this characteristic, how might you classify this organism?
A. Eukaryote B. Prokaryote C. Heterotroph D. Autotroph
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.