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University of Central Florida FIL 1000 Ch

Chemistry

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University of Central Florida

FIL 1000

Ch.19 Quiz

1)"Energy charge" in a cell is a measure of Select one:

a.            ATP/NAD+ ratios.

b.            ATP/NADH ratios. c. ATP/ADP ratios.

d. NADH/NAD+ ratios.

e. NAD+/ADP ratios.

 

2.            All but one of the enzymes of the citric acid cycle are found in this part of the mitochondrion: Select one:

a.            The outer membrane.

b.            The inner membrane.

c.             The mitochondrial matrix.

d.            The intermembrane space.

 

e.            It is not known where these enzymes are located.

 

3.            In the conversion of succinyl-CoA to succinate, GTP is produced from GDP in a reaction in which the source of the added phosphate is

Select one:

a.            ATP.

b.            ADP.

c.             phosphenolpyruvate.

d.            inorganic phosphate ion.

 

4.            Intermediates of the citric acid cycle are especially important in the synthesis of fatty acids and amino acids.

Select one:

a.            True b. False

 

5.            One round of the citric acid cycle generates about ten equivalents of ATP. Select one:

a.            True b. False

 

6.            The conversion of citrate to isocitrate is remarkable because Select one:

a.            it is a condensation reaction.

b.            a chiral center is introduced in a molecule that did not have one previously.

c.             a dehydration reaction is involved.

d.            the enzyme that catalyzes it has very little specificity.

 

7.            The only difference between succinate and fumarate is the geometry around their double bonds, one contains a cis double bond and the other contains a trans double bond.

Select one:

a.            True b. False

 

8.            When acetyl-CoA reacts with oxaloacetate to form citrate Select one:

a.            a new carbon-carbon bond is formed

b.            an oxidative decarboxylation reaction takes place

c.             a dehydration reaction takes place

d.            a rearrangement takes place

e.            none of these

 

9.            Which enzymes in the citric acid cycle catalyze oxidative decarboxylation reactions? Select one:

a.            isocitrate dehydrogenase and the α-ketoglutarate dehydrogenase complex

b.            aconitase and succinate dehydrogenase

c.             the α-ketoglutarate dehydrogenase complex and succinate thiokinase

d.            fumarase and succinate dehydrogenase

 

10.          Which of the following enzymes contains a non-heme iron? Select one:

a.            citrate synthase

b.            succinyl-CoA synthetase c. succinate dehydrogenase

d. fumarase