Question

21.) Exactly two of the enzymes in glycolysis belong to what enzyme classification?

A) hydrolase         B) isomerase        C) lyase                 D) transferase      E) ligase      F) hydratase   G) oxidoreductase

25.) What amino acid residue would be the most likely target for attachment of biotin or lipoic acid?

                A) glycine              B) lysine                C) leucine              D) cysteine            E) serine                F) tyrosine             E) tryptophan

Answer 1

21. Answer: Option F is correct
Explanation:
The class numbers of all the ten glycolytic enzymes are given below.
ALdolase and enolase belong to hydratases.
Hexokinase = 2
Phosphoglucoseisomerase = 5
Phsophofructokinase = 2
Aldolase = 4
Triosephosphate isoemrase = 5
G-3-P dehydrogenase = 1
Phosphoglycerate kinase = 2
Phosphoglycerate mutase = 5
Enolase = 4
Pyruvate kinase = 2

25. Answer: Option D is correct
Explanation:
Biotin forms linkage with Cysteine in the protein.