If more than one codon specifies the same amino acid, the code is said to be
A) complementary.
B) inverse.
C) redundant.
D) ambiguous.
E) degenerate.
E) degenerate.
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Paramecium is a single-cell eukaryotic organism that can reproduce by mitotic cell division. Prior to the M phase of the cell cycle, which of the following must occur?
A. The cell must replicate its chromosomes. B. The cell must first be fertilized. C. The nucleus must divide. D. Chromatids must be separated. E. The nuclear envelope must disintegrate.
Sickle cell anemia is a condition in which red blood cells of patients exhibit a characteristic "sickle" shape. This arises from a mutation or change in one of the amino acids found in hemoglobin. Knowing this, what level of protein structure is most directly affected by this single amino acid mutation?
A. primary B. secondary C. tertiary D. quaternary E. None of the choices are correct.
Carbon returns to the atmosphere
A. from respiration of plants. B. by the burning of fossil fuels. C. All of the answer choices are correct. D. from respiration of animals. E. as carbon dioxide.
A _________ is a surgical procedure that allows breathing from an incision in the trachea.
a. true b. false