1. Which of the following is an epime pair? a. D-glucose and D-mannose b. D-lact

Question

1. Which of the following is an epime pair? a. D-glucose and D-mannose b. D-lactose and D-maltose d. L-mannose and L-fructose e. D-glucose and L-glucose 2. If Glucose labeled with Ci4 in C-3 is metabolized to Lactate solely via Glycolysis, the lactate will contain C14 in: a. All three carbon atoms. b. The carboxyl carbon atom only. c. The carbon atom carrying the -OH only. d. The methyl and carboxyl carbon atoms. e. The methyl carbon atom only. 3. Consider the following reaction: Pyruvate + AG--61.9 AG--30.5 yruvate Pi kJmole kJmole The approximate for this reaction is: a. 1.0 x 102 b. 3.1 x 10 c. 3.1 x 10% d. 8.5 x 10 e. 1.8 x 10 a used in both Glycolysis and Gluconeogenesis is a. Hexokinase b. Glucose-6-Phosphatese c. 3-Phosphoglycerate Kinase d. Phosphofructokinase-1

Explanation / Answer

1.

Correct: D-glucose and D-mannose are the epimers as these two sugars are differ only in C-2 configuration.

Hence, the correct option is (a).

Incorrect: all the other options do not justify the conditions for being epimer and hence, are incorrect.

2.

Correct: the lactate will contain C14 in carboxyl carbon atom only.

Hence, the correct option is (b).

4.

Correct: All the enzymes listed are specific to either glycolysis or gluconeogenesis, except for phosphoglycerate kinase. It is one of seven enzymes common to both glycolysis and gluconeogenesis.

Hence, the correct option is (c).

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