Chapter 11 Multiple Choice Questions

. Which of the following statements, concerning the structure and chemistry of carbohydrates, is correct?

Monosaccharides always contain six carbon atoms.

Hexoses are more likely to exist in their open-chain forms.

Glycosidic bonds between two monosaccharides always join two anomeric carbons.

Hexose sugars can form five-membered rings.

. Which of the following statements, regarding some common carbohydrates, is correct?

Ribose is a pentose sugar.

Sucrose is a disaccharide of galactose and glucose.

D-Glyceraldehyde rotates plane polarised light in the anti-clockwise direction.

Glucose can be classified as an oligosaccharide.

. Which of these types of bond are NOT found in glycogen?

α1-6

β1-6

α1-4

Both α1-4 and α1-6

. Which molecules are activated carriers in metabolic reactions?

NADH, NADPH, FADH₂ and acetyl coenzyme A

ADP, ATP and H⁺

NAD⁺, NADP⁺, FAD and coenzyme A

H⁺, NAD⁺ dehydrogenase, O₂ and H₂O

. Which of the following statements about phosphofructokinase is NOT true?

It is involved in both glycolysis and gluconeogenesis.

It is inhibited by high levels of ATP.

It has two ATP binding sites.

It is inhibited by citrate.

. Which statement about glycolysis is true?

Glucose is formed from pyruvate during glycolysis

Glycolysis is the exact reverse of gluconeogenesis

Glycolysis occurs in the mitochondria

Glycolysis can occur under anaerobic conditions

. What is the overall net equation of the citric acid cycle?

Acetyl-coA + 3NAD⁺ + FAD + ADP + P_i + 2H₂O = CoA + 2CO₂+ 3NADH + FADH₂ + ATP + 2H⁺

Glucose + 2NAD⁺ + 2ADP + 2P_i = 2Pyruvate + 2ATP+ 2NADH + 2H₂O + 2H⁺

CoA + NAD⁺ + 3FAD + ADP + P_i + 2H₂O = Acetyl-coA + 2CO₂+ NADH + 3FADH₂ + ATP + 2H⁺

Glucose + 2H₂O + 10NAD⁺ + 2FAD + 4ADP + 4P_i + = 6CO₂+ 10NADH + 2FADH₂ + 4ATP + 10H⁺

. Which of the following is NOT an entry compound for gluconeogenesis?

Glycerol.

Pyruvate.

Lactate.

Stearic acid.

. Which of the following steps in gluconeogenesis is NOT reversible?

Pyruvate to oxaloacetate.

Phosphoenolpyruvate to 2-phosphoglycerate.

Fructose-6-phosphate to glucose-6-phosphate.

2-Phosphoglycerate to 3-phosphoglycerate.

. Which of the following statements about insulin is NOT true?

Insulin is a peptide.

Insulin is secretes by the β-cells of the pancreas.

Insulin stimulates the release of glucose from cells.

Insulin promotes removal of glucose from the bloodstream.

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