quiz 5

Question 1

An enzyme used in both glycolysis and gluconeogenesis is:
a. Hexokinase
b. Glucose-6-phosphatase
c. 3-phosphoglycerate kinase
d. Phosphofructokinase-1

Answer 1

c. 3-phosphoglycerate kinase

Question 2

The bond that links two monosaccharides of a disaccharide is called:
a. Ionic
b. Glycosidic
c. Hydrogen
d. Acidic

Answer 2

b. Glycosidic

Question 3

What reactions of glycolysis are not reversible under intracellular conditions?
a. Fructose-6-phosphate to fructose-1,6-bisphosphate
b. Glucose-6-phosphate to fructose-6-phosphate
c. 2-phosphoglycerate to phosphoenolpyruvate
d. 3-phosphoglycerate to 2-phosphoglycerate

Answer 3

a. Fructose-6-phosphate to fructose-1,6-bisphosphate

Question 4

Stereoisomers that are non-superimposable, complete, mirror images of each other are known as:
a. Enantiomers
b. Diastereoisomers
c. Chiral compounds
d. Cis-trans isomers

Answer 4

a. Enantiomers

Question 5

Identify the following structure:
(image has an amide, amine group, and phosphorus group)
a. NAD+
b. Vitamin C
c. ATP
d. Coenzyme A

Answer 5

a. NAD+

Question 6

Which of these is a general feature of the lipid bilayer in all biological membranes?
a. Polar, but uncharged, compounds readily diffuse across the bilayer.
b. Individual lipid molecules are free to diffuse laterally in the surface of the bilayer.
c. Individual lipid molecules in one face (monolayer) of the bilayer readily diffuse (flip-flop) to the other monolayer.
d. The bilayer is stabilized by covalent bonds between neighboring phospholipid molecules.

Answer 6

c. Individual lipid molecules are free to diffuse laterally in the surface of the bilayer.

Question 7

A person who cannot synthesize liver fructose-1,6-bisphosphatase would probably experience:
a. Failure to synthesize fats when the diet contained excess carbohydrate.
b. Inability to metabolize fructose.
c. Inability to convert fructose-1,6-bisphosphate into triose phosphates.
d. Inability to resynthesize glucose from lactate produced during exercise

Answer 7

d. Inability to resynthesize glucose from lactate produced during exercise.

Question 8

Which is not a function of NADPH?
a. Reducing factor that prevents oxidative damage
b. Helps synthesize fatty acid and cholesterol
c. Helps aid in the steroid hormone synthesis
d. Promotes free radical

Answer 8

d. Promotes free radical

Question 9

What are some reasons why pyruvate cannot be oxidized within the mitochondria?
a. Genetic defects in pyruvate dehydrogenase
b. Defects in the electron transport chain
c. Hypoxia
d. All of the above

Answer 9

All of the above

Question 10

What does enolase catalyze?
a. 2-phosohoglycerate to phosphoenolpyruvate
b. Glucose to Glucose-6-phosphate
c. 3-phosphoglycerateto 2-phoshoglycerate
d. None of the above

Answer 10

a. 2-phosohoglycerate to phosphoenolpyruvate