2011 biochem endterm

Question 1

What will inhibit the TCA cycle?

a. Insulin
b. NADH
c. AMP

Answer 1

b. NADH

Question 2

Which of the following statements is correct regarding the food guide pyramid of 2012?

a. Proteins represent the main energy supply
b. Lipids represent the main energy supply
c. Carbohydrates represent the main energy supply

Answer 2

c. Carbohydrates represent the main energy supply

Question 3

What is the electron carrier in Complex I of the electron transport chain?

a. Fe-S centers
b. Ubiquinol

Answer 3

a. Fe-S centers

Question 4

What is a consequence of increased consumption of trans fats?

a. Decreased LDL cholesterol and increased HDL
b. Increased LDL cholesterol and decreased HDL

Answer 4

b. Increased LDL cholesterol and decreased HDL

Question 5

What is the function of N-acetylglutamate?

a. Inhibit carbomyl phosphate synthetase I
b. Allosteric activation of carbomyl phosphate synthetase I
c. Inhibit the urea cycle

Answer 5

b. Allosteric activation of carbomyl phosphate synthetase I

Question 6

Which amino acid is produced by the kidneys in prolonged starvation?

a. Creatine
b. Glutathione
c. Asparagine
d. Glutamine

Answer 6

d. Glutamine

Question 7

Why is vitamin E considered an antioxidant?

a. it removes free radicals
b. it forms a stable free radical

Answer 7

b. it forms a stable free radical

Question 8

A 32-year-old man with a BMI of 24 went on a hunger strike. How long will he survive?

Answer 8

50-75 days

Question 9

What do SCAP and HMG-CoA reductase sense?

a. ER cholesterol
b. Plasma cholesterol
c. Mitochondrial cholesterol
d. Golgi cholesterol

Answer 9

a. ER cholesterol

Question 10

Where is the Pentose Phosphate Pathway highly active?

a. In adipose tissue
b. In neuronal cells
c. In rapidly proliferating cells

Answer 10

c. In rapidly proliferating cells