Vitamin B-12 is required for an enzymatic reaction involved in _____ metabolism.Multiple choice question.alcoholcarbohydratetryptophanhomocysteine

The B vitamin required as a coenzyme to metabolize carbohydrates and some amino acids is _____.Multiple choice question.folatebiotinthiaminvitamin B-12

What substance produced by the digestive system is necessary in order to absorb vitamin B-12?Multiple choice question.GastrinSalivary amylaseIntrinsic factorPepsin

When either folate or vitamin B-12 is lacking, the amount of homocysteine in the body ______.Multiple choice question.increasesdecreases

What vitamin is needed by nearly all amino acids for metabolism?Multiple choice question.Vitamin CRiboflavinVitamin B-6

Vitamin B-12 is found in ______ foods only.Multiple choice question.animalfortifiedplantfresh