Chemistry of Carbohydrates…………….………………………………………………………………...27

24- Which one of the following statements about the major collagen type from skin or bone is INCORRECT:

a. One third of the amino acids of collagen is glycine. b. Ascorbic acid is required for the synthesis of collagen. c. The collagen molecule contains nonhelical chains. d. Collagen molecule is trimmer composed of three monomers, each containing approximately 1050 amino acids. e. By boiling, collagen molecule gives gelatin. ANS: c

25- Albumin, globulin, histones and scleroproteins belong to the class of:

a. Simple proteins b. Conjugated proteins c. Derived proteins d. Basic proteins e. Acidic proteins ANS: a

26- All of the following are sulfur containing amino acids EXCEPT:

a. Cysteine b. Homocysteine c. Cystine d. Methionine e. Threonine ANS: e

27- Methionine is:

a. Acidic amino acid b. Basic amino acid c. Sulfur containing amino acid d. Hydroxyl containing amino acid e. Aromatic amino acid ANS: c

28- Lysine is:

a. Neutral amino acid b. Acidic amino acid c. Basic amino acid