Carbohydrate – Section 1

11. Which of the following statements about the energy needs of cells is false?

A. Without a continuous input of energy, cell disorder will increase
B. The laws of thermodynamics force cells to acquire energy
C. Many cellular reactions have an associated activation energy
D. The most usable energy for cells comes from the rapid combustion of glucose

Correct Answer: D. The most usable energy for cells comes from the rapid combustion of glucose

12. In lysozyme catalysis, which of the following does not contribute?

A. The abnormally high pKa of Glu35
B. The strained conformation of the D sugar
C. Formation of a covalent intermediate at Asp52
D. Formation of a covalent intermediate at Ser195

Correct Answer: D. Formation of a covalent intermediate at Ser195

13. Cellulose fibers resemble the protein structure in the form of

A. β-sheets
B. α-helices
C. β-turns
D. None of these

Correct Answer: A. β-sheets

14. During vigorous exercise, pyruvate produced by glycolysis is converted to

A. acetate
B. lactate
C. monosodium phosphate
D. pyruvic acid

Correct Answer: B. lactate

15. Glucagon and epinephrine

A. inhibits gluconeogenesis and stimulates glycolysis
B. stimulates gluconeogenesis and glycolysis
C. stimulates gluconeogenesis and inhibits glycolysis
D. inhibits gluconeogenesis and glycolysis

Correct Answer: C. stimulates gluconeogenesis and inhibits glycolysis

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