University of Central Florida FIL 1000 Ch

University of Central Florida

FIL 1000

Ch. 17 Quiz

1)In glycolysis, ATP is synthesized by Select one:

a.            substrate-level phosphorylation.

b.            oxidative phosphorylation.

c.             photophosphorylation.

d.            both substrate-level and oxidative phosphorylation.

e.            all three of the above methods.

2.            In humans, pyruvate can be converted to Select one:

a.            acetyl-CoA only.

b.            lactate only.

c.             ethanol only.

d.            acetyl-CoA and lactate.

3.            In the conversion of glucose to pyruvate, how many of the actual steps involve electron transfer?

Select one:

a.            none b. 1

c.             2

d.            3

e.            4

4.            The fate of pyruvate produced during glycolysis depends primarily on the availability of Select one:

a.            NAD+ to keep the pathway going. b. molecular oxygen.

c.             ADP for conversion to ATP.

d.            coenzyme A for further metabolism of pyruvate.

e.            phosphoric acid for the synthesis of ATP.

5.            The phosphorylation of fructose 6-phosphate to fructose-1,6-bisphosphate is the committed step in glycolysis because

Select one:

a.            it is the rate-limiting step.

b.            it is the most strongly exergonic step in the pathway.

c.             fructose 1,6-bisphosphate can undergo no other reactions than those of glycolysis.

d.            two phosphate groups are involved.

6.            The reduction of pyruvate to lactate Select one:

a.            allows for recycling of NAD+.

b.            is the process that aids in the recovery of sore muscles after exercise.

c.             is accompanied by phosphorylation of ADP.

d.            does not occur in aerobic organisms.

7.            When humans consume ethanol, the first step in its metabolism is: Select one:

a.            conversion to lactate

b.            conversion to acetaldehyde

c.             conversion to acetone

d.            production of fat

8.            Which enzyme is the key regulatory enzyme in glycolysis? Select one:

a.            Glyceraldehyde-3-phosphate dehydrogenase

b.            Enolase

c.             Phosphofructokinase

d.            Aldolase

9.            Which group of small molecules best fit the boxes associated with the reaction shown?

a              b             c

I.             ATP        ADP       H2O

II.            NADH NAD+ Pi

III.           NAD+ NADH H2O

IV.          NAD+ NADH Pi Select one:

a.            I

b.            II

c.             III d. IV

10.          Enolase catalyzes Select one:

a. the cleavage of fructose bisphosphate into two 3-carbon units. b. the dehydration of 2-phosphoglycerate.

c. the conversion of phosphoenolpyruvate to pyruvate.

d. the conversion of glucose-6-phosphate to fructose-6-phosphate.