In the digestive system, most nutrient absorption occurs in the
A) stomach.
B) pancreas.
C) small intestine.
D) large intestine.
Answer: C
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Trichonympha is a unicellular flagellated protist that lives within termites and allows the termite to be able to "digest" wood. Trichonympha is which of the following?
A. a slime mold B. a protozoan C. an alga D. a diatom E. an apicomplexan
Four of the five answers listed below are
caused by recessive genes. Select the EXCEPTION.
a. achondroplasia. b. phenylketonuria. c. Tay-Sachs. d. hemophilia e. Duchenne muscular dystrophy
A peptide bond
A) is a covalent bond between the carboxyl carbon of one amino acid and the amino nitrogen of a second amino acid. B) is a covalent bond between the functional R groups of adjacent amino acids. C) is a covalent bond between the NH group of one polypeptide and the CO group of an adjacent polypeptide that holds together multimeric proteins. D) is a noncovalent bond that dictates the tertiary structure of a protein. E) is a covalent bond between adjacent glucose molecules in a peptide.
Substrate activation may involve
A) a change in enzyme conformation induced by substrate binding. B) accepting protons from the enzyme. C) formation of temporary covalent bonds. D) donation of protons to the enzyme. E) All of these are correct.