15. Most proteins in the endoplasmic reticulum (ER) lumen have a tetrapeptide (KDEL) at their C-terminus. Where would ER-resident proteins lacking the C-terminal KDEL be destined for? (2.5 points)(A)The cytosol(B)The Golgi apparatus(C)The plasma membrane(D)The extracellular space

22. Which one is incorrect? (2.5 points)(A)Vitamins are often precursors to coenzymes.(B)Vitamins are small biomolecules that are needed in small amounts in the diets of higher animals.(C)The water-soluble vitamins are vitamin C (ascorbate, an antioxidant) and the vitamin B complex (components of coenzymes).(D)Ascorbate is required for the hydroxylation of proline residues in collagen, a key protein of connective tissue.(E)The water-soluble vitamins are vitamin A (a precursor of retinal), D (a regulator of calcium and phosphorus metabolism), E (an antioxidant in membranes), and K (a participant in the carboxylation of glutamate).

15. Most proteins in the endoplasmic reticulum (ER) lumen have a tetrapeptide (KDEL) at their C-terminus. Where would ER-resident proteins lacking the C-terminal KDEL be destined for? (2.5 points)

(A)The cytosol

(B)The Golgi apparatus

(C)The plasma membrane

(D)The extracellular space

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