Question 1

When a molecule of glycerol is metabolized how many ATP molecules are produced?

Accepted Answer

A)   3
B)   6
C)   18
D)   20 D

Question 2

Addition across the double bond of a fatty acid results in which of the following?

Accepted Answer

A)   putting a hydroxyl group on the α-carbon
B)   putting a hydroxyl group on the β-carbon
C)   putting hydroxyl groups on both the α- and β-carbons
D)   putting a hydroxyl group on either the α- or β-carbon, depending on the identity of the original fatty acid B

Question 3

The carbon skeletons of amino acids can be used as which of the following?

Accepted Answer

A)   an energy source
B)   a starting material for the synthesis of more complicated molecules
C)   both a and b
D)   neither a nor b C

Question 4

Which of the following is may be present in the blood in higher than normal concentrations during periods of starvation?

Accepted Answer

A)   ​
B)   ​
C)   ​
D)   All might be present in higher than normal concentrations.

Question 5

How many ATP molecules are produced as a result of the complete metabolism of one molecule of glucose in the heart or liver?

Accepted Answer

A)   12
B)   24
C)   36
D)   38

Question 6

Oxidation of a hydroxy fatty acid does which of the following?

Accepted Answer

A)   converts an α-hydroxy to an α-ketone
B)   converts a β-hydroxy to an β-ketone
C)   both a nor b
D)   neither a nor b

Question 7

The action of acyl-CoA dehydrogenase and FAD on the fatty acid results in which of the following?

Accepted Answer

A)   elimination of a C2 fragment
B)   formation of a cis-double bond between the α- and β-carbon atoms
C)   formation of a trans-double bond between the α- and β-carbon atoms
D)   none of the above

Question 8

Which of the following could be the reactants in an oxidative deamination?

Accepted Answer

A)   α-ketoglutarate, NAD+ and H2O
B)   α-ketoglutarate, NADH and H+
C)   glutamate, NAD+ and H2O
D)   glutamate, NADH and H+

Question 9

Which of the following is a reactant in transamination?

Accepted Answer

A)   α-ketoglutarate
B)   β-ketogluarate
C)   glutamate
D)   none of these

Question 10

The following fatty acid enters the β-oxidation spiral.  and the product shown below is produced.  How many FADH2 are produced?

Accepted Answer

A)   10
B)   5
C)   4
D)   1

Question 11

How many high-energy phosphate bonds are cleaved during activation of fatty acid β-oxidation?

Accepted Answer

A)   0
B)   1
C)   2
D)   3

Question 12

Consider the following reaction sequence. 
-Why must carbohydrates, fats and proteins be broken down into small molecules?

Accepted Answer

A)   so they can be absorbed through the walls of the stomach
B)   so they can be absorbed through the walls of the intestines
C)   so they can be properly excreted
D)   so we can enjoy their tastes and aromas

Question 13

Which of the following is true of the amino acids in the amino acid pool?

Accepted Answer

A)   They are never used as a fuel for energy.
B)   They are sometimes used as a fuel for energy.
C)   They are often used as a fuel for energy.
D)   They are the major fuel used for energy.

Question 14

How many molecules of ATP are produced during a single turn of the β-oxidation cycle?

Accepted Answer

A)   2
B)   3
C)   4
D)   5

Question 15

For oxidative phosphorylation to occur which of the following is true of the NADH and H+ produced during glycolysis?

Accepted Answer

A)   Since it is produced in the cytoplasm it can be used directly.
B)   Since it is produced in the mitochondria it can be used directly.
C)   Since it is produced in the cytoplasm it cannot be used directly because oxidative phosphorylation occurs in the mitochondria.
D)   Since it is produced in the mitochondria it cannot be used directly because oxidative phosphorylation occurs in the cytoplasm.

Question 16

How many ATP molecules are produced as a result of the complete metabolism of one molecule of glucose in skeletal muscles?

Accepted Answer

A)   4
B)   6
C)   24
D)   36

Question 17

Which of the following is the difference between lysine and ornithine?

Accepted Answer

A)   Lysine has one less CH2 group than does ornithine.
B)   Lysine has one more CH2 group than does ornithine.
C)   The side chain in ornithine is cyclic but that in lysine is linear.
D)   The side chain in ornithine is linear but that in lysine is cyclic.

Question 18

The conversion of glyceraldehyde 3-phosphate to 1,3-bisphosphoglycerate is an example of which of the following reactions?

Accepted Answer

A)   hydrolysis
B)   isomerization
C)   oxidation
D)   reduction

Question 19

When one molecule of glucose undergoes glycolysis, two molecules of glyceraldehyde 3-phosphate are produced; these are then phosphorylated to yield two 1,3-bisphosphoglycerates. How many molecules of ATP are produced by the phosphorylation of two molecules of glyceraldehyde 3-phosphate to yield two 1,3-bisphosphoglycerates?

Accepted Answer

A)   2
B)   4
C)   6
D)   12

Question 20

In how many steps of the glycolysis pathway are Mg2+ ions needed?

Accepted Answer

A)   3
B)   4
C)   5
D)   6

Exam 28: Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism