12. Fibrous proteins, such as collagen, have which one of the following properties? (A)Highly soluble in water. (B) Their hydrophilic residues are directed into the interior of the protein. (C)Exhibit enzymatic activity. (D)Serve structural roles in the cell.(E) Monomeric.

3. All of the following functions of an enzyme are true EXCEPT:(A) Enzymes help to catalyze virtually every metabolic reaction.(B) Enzymes mediate the rates of cellular reaction in proportion to cellular requirements.(C) Enzymes are sensitive to temperature, pH, and concentration changes.(D) An increased activity of an enzyme increases the amount of energy produced.(E) Enzymes are used as a catalyst to increase reaction rates many orders of magnitude.

12. Fibrous proteins, such as collagen, have which one of the following properties?
(A)Highly soluble in water.
(B) Their hydrophilic residues are directed into the interior of the protein.
(C)Exhibit enzymatic activity.
(D)Serve structural roles in the cell.
(E) Monomeric.

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