What kind of proteins do the ras proto-oncogenes encode?
A. Signal transduction proteins D. DNA polymerases
B. Tumor-suppressing proteins E. Mitotic spindle proteins
C. DNA repair proteins
A
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Which structures return blood to the heart?
A) capillaries B) veins C) arteries D) sinoatrial nodes
The bond that builds amino acid monomers into protein polymers is
A. a covalent bond also known as a peptide bond. B. a denatured hydrogen bond. C. a covalent bond also know as a glycosidic bond. D. an ionic bond also known as a peptide bond. E. a primary structural bond.
An enzyme is active in the stomach of an animal but quickly loses its activity when it leaves the stomach. This example illustrates that enzymes are
A) specific to the organs in which they are produced. B) inactivated by movement. C) sensitive to changes in pH. D) digested in the small intestine. E) consumed by the quantities of substrate in the small intestine.
The products of the process in Figure 3-1 are:a
amino acids. b. molecules of glycerol. c. representative of a glycoside linkage. d. enzymes. e. monosaccharides