1. Which compound is converted into 2-phosphoglycerate during glycolysis?
A.
3-Phosphoglycerate
B.
1,3-Bisphosphoglycerate
C.
Phosphoenolpyruvate
D.
Glyceraldehyde-3-phosphate
Correct Answer:
3-Phosphoglycerate
Explanation:
3-Phosphoglycerate is converted into 2-phosphoglycerate during the corresponding step of glycolysis.
2. Which enzyme catalyzes the formation of 2-phosphoglycerate?
A.
Phosphoglycerate mutase
B.
Phosphoglycerate kinase
C.
Enolase
D.
Pyruvate kinase
Correct Answer:
Phosphoglycerate mutase
Explanation:
Phosphoglycerate mutase catalyzes the rearrangement of 3-phosphoglycerate to form 2-phosphoglycerate.
3. During the formation of 2-phosphoglycerate, what happens to the phosphate group?
A.
It moves from carbon 3 to carbon 2
B.
It moves from carbon 2 to carbon 3
C.
It is removed from the molecule
D.
A second phosphate group is added
Correct Answer:
It moves from carbon 3 to carbon 2
Explanation:
Phosphoglycerate mutase shifts the phosphate group within the molecule from carbon 3 to carbon 2.
4. What type of reaction forms 2-phosphoglycerate from 3-phosphoglycerate?
A.
Intramolecular rearrangement
B.
Oxidation
C.
Hydrolysis
D.
Decarboxylation
Correct Answer:
Intramolecular rearrangement
Explanation:
The reaction rearranges the position of the phosphate group within the same three-carbon molecule.
5. How many phosphate groups are present in one molecule of 2-phosphoglycerate?
A.
One
B.
Two
C.
Three
D.
None
Correct Answer:
One
Explanation:
2-Phosphoglycerate contains one phosphate group attached to carbon 2.
6. Does the formation of 2-phosphoglycerate directly produce ATP?
A.
No, it does not directly produce ATP
B.
Yes, one ATP is produced
C.
Yes, two ATP molecules are produced
D.
Yes, one ATP is consumed
Correct Answer:
No, it does not directly produce ATP
Explanation:
The conversion of 3-phosphoglycerate to 2-phosphoglycerate only shifts the phosphate group and does not involve direct ATP formation.
7. Which carbon atom bears the phosphate group in 2-phosphoglycerate?
A.
Carbon 2
B.
Carbon 1
C.
Carbon 3
D.
Carbon 4
Correct Answer:
Carbon 2
Explanation:
The name 2-phosphoglycerate indicates that its phosphate group is attached to carbon 2.
8. What is the direction of the glycolytic conversion catalyzed by phosphoglycerate mutase in this step?
A.
3-Phosphoglycerate to 2-phosphoglycerate
B.
2-Phosphoglycerate to 3-phosphoglycerate only
C.
2-Phosphoglycerate to phosphoenolpyruvate
D.
1,3-Bisphosphoglycerate to 3-phosphoglycerate
Correct Answer:
3-Phosphoglycerate to 2-phosphoglycerate
Explanation:
In this glycolytic step, phosphoglycerate mutase converts 3-phosphoglycerate into 2-phosphoglycerate.
9. What kind of carbon skeleton does 2-phosphoglycerate have?
A.
Three-carbon skeleton
B.
Two-carbon skeleton
C.
Four-carbon skeleton
D.
Six-carbon skeleton
Correct Answer:
Three-carbon skeleton
Explanation:
2-Phosphoglycerate is a three-carbon intermediate formed from the three-carbon compound 3-phosphoglycerate.
10. Which statement correctly describes the formation of 2-phosphoglycerate?
A.
The phosphate group changes position within 3-phosphoglycerate
B.
A phosphate group is added to glucose
C.
The three-carbon molecule is split into two molecules
D.
Carbon dioxide is removed from 3-phosphoglycerate
Correct Answer:
The phosphate group changes position within 3-phosphoglycerate
Explanation:
Formation of 2-phosphoglycerate involves an internal shift of the phosphate group, without splitting or removing carbon dioxide.
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