A fatty acid having double bonds between carbon atoms is a(n)
A. phospholipid.
B. animal fat.
C. unsaturated fat.
D. saturated fat.
C. unsaturated fat.
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As free oxygen increased in the early atmosphere,
a. most anaerobic organisms perished. b. some anaerobic organisms survived in seafloor sediments. c. organisms evolved pathways for detoxifying oxygen. d. the amount of UV radiation reaching the earth decreased. e. all of these happened.
The total number of different three-base combinations of the four nucleic acid bases is:
a. 12. b. 16. c. 20. d. 64. e. 256.
This occurs when insertions or deletions cause the ribosome to read the wrong sets of three nucleotides.
A. point mutation B. frameshift C. translocation D. transcription
Agglutination tests make use of the fact that
A) antibodies have two antigen-binding sites and will cause clumping when bound to antigen. B) the presence of antibodies in a patient's serum will prevent viral infection of cells in culture. C) a reporter enzyme can be bound to an antibody to provide a visual change with a positive test. D) antibodies bound to antigen will precipitate in a gel matrix. E) T cells will release interferon-gamma during certain infections.