Biochemistry for Nurses Metabolism Quiz (Chapters 22 and 23)                   

1.  The end products of catabolism are

a. nucleic acids, glycogen, lipids and proteins
b. glucose and oxygen
c. carbon dioxide and water
d. pentoses and hexoses
e. None of these

2.  An enzyme

a. Increases the equilibrium constant of a reaction and makes more products
b. Decreases the equilibrium constant of a reaction and makes less products
c. Increases the rate of the reaction by decreasing the activation energy
d. Decreases the activation energy and increases the reaction rate
e. None of these

3.  Which of the following are enzyme cofactors that are derived from vitamins?

I. Thiamine, riboflavin and cyanocobalamine
II. Heme
III. Nicotinamide Adenine Dinucleotide
IV. Protoporphorin IX


a. I and III    b. I, II and III     c. II and IV     d. IV only      e. none of these

4.  What are the important products of glycolysis

a.  NADH
b.  NAD, pyruvate, CO2, H2O
c.  ATP, pyruvate, NADH
d.  Acetyl CoA
e.  None of these

5.  How are carbohydrates stored in the liver and muscle tissue?

a.  As ribose and glucose-6-phosphate
b.  As acetyl CoA
c.  As glycogen
d.  As amylose
e.  None of these

6.  When and why is pyruvate converted to lactate?

  1. When there is too much oxygen and lactate needs to go to the liver to make alanine
  2. Where there is not enough oxygen and NAD needs to be regenerated from NADH
  3. When the electron transport chain needs lactate to receive the electrons from NADH
  4. When ATP levels are low and NADH needs to be regenerated from NAD
  5. None of these.

7.  Several tissues make glucose from pyruvate. Only one tissue can release this glucose into the blood stream. What tissue regulates blood glucose by releasing glucose into the blood and how does it do this. (What does it have that the other tissues are lacking?) 

  1. The brain regulates blood glucose levels because it has glycogen phosphorylase
  2. The liver regulates blood glucose levels because it has glycogen phosphorylase
  3. The liver regulates blood glucose levels because it has glucose-6-phosphatase
  4. The muscles regulate blood glucose levels because they have glucose-6-phosphatase
  5. none of thesewrong.htm
8.  What are the principle products of the citric acid cycle?
  1. Carbon dioxide, water, NAD, FAD
  2. NADH, FADH2, carbon monoxide, water
  3. Pyruvate, ATP, NADH
  4. Carbon dioxide, NADH, FADH2,water
  5. None of these

9.  What are the three steps in glycolysis that are regulated? Give the names or structures of the reactants and all products and give the name of the enzyme for each reaction.

10.  Is gluconeogenesis the exact reverse of glycolysis? Why or why not? Be specific about any differences.