1. Which molecule is converted into fructose-6-phosphate during glycolysis?
A.
Glucose-6-phosphate
B.
Fructose-1,6-bisphosphate
C.
Pyruvate
D.
Glyceraldehyde-3-phosphate
Correct Answer:
Glucose-6-phosphate
Explanation:
Fructose-6-phosphate is formed by the isomerization of glucose-6-phosphate.
2. Which enzyme catalyzes the formation of fructose-6-phosphate?
A.
Hexokinase
B.
Phosphoglucose isomerase
C.
Phosphofructokinase
D.
Pyruvate kinase
Correct Answer:
Phosphoglucose isomerase
Explanation:
Phosphoglucose isomerase converts glucose-6-phosphate into fructose-6-phosphate.
3. What type of reaction forms fructose-6-phosphate from glucose-6-phosphate?
A.
Isomerization
B.
Phosphorylation
C.
Oxidation
D.
Reduction
Correct Answer:
Isomerization
Explanation:
The reaction rearranges glucose-6-phosphate into its isomer, fructose-6-phosphate.
4. In which part of the cell is fructose-6-phosphate formed during glycolysis?
A.
Nucleus
B.
Mitochondrial matrix
C.
Cytoplasm
D.
Chloroplast
Correct Answer:
Cytoplasm
Explanation:
Glycolysis, including the formation of fructose-6-phosphate, occurs in the cytoplasm.
5. How many phosphate groups are present in fructose-6-phosphate?
A.
One
B.
Two
C.
Three
D.
None
Correct Answer:
One
Explanation:
Fructose-6-phosphate contains one phosphate group attached to the fructose molecule.
6. Which statement correctly describes fructose-6-phosphate formation?
A.
Glucose-6-phosphate is rearranged into fructose-6-phosphate
B.
Fructose is split into two three-carbon molecules
C.
Pyruvate is converted into fructose-6-phosphate
D.
Fructose-1,6-bisphosphate loses both phosphate groups
Correct Answer:
Glucose-6-phosphate is rearranged into fructose-6-phosphate
Explanation:
Formation of fructose-6-phosphate involves rearrangement of the atoms in glucose-6-phosphate.
7. Is ATP directly used in the conversion of glucose-6-phosphate to fructose-6-phosphate?
A.
Yes, one ATP is used
B.
Yes, two ATP are used
C.
No, ATP is not directly used
D.
Yes, three ATP are used
Correct Answer:
No, ATP is not directly used
Explanation:
The conversion is an isomerization reaction and does not require direct ATP use.
8. Fructose-6-phosphate is formed at which stage of glycolysis?
A.
The second step
B.
The fifth step
C.
The eighth step
D.
The tenth step
Correct Answer:
The second step
Explanation:
In glycolysis, glucose-6-phosphate is converted to fructose-6-phosphate in the second step.
9. Which pair correctly represents the substrate and product in fructose-6-phosphate formation?
A.
Glucose-6-phosphate and fructose-6-phosphate
B.
Glucose and glucose-6-phosphate
C.
Fructose-6-phosphate and pyruvate
D.
Fructose-1,6-bisphosphate and lactate
Correct Answer:
Glucose-6-phosphate and fructose-6-phosphate
Explanation:
Glucose-6-phosphate is the substrate, and fructose-6-phosphate is the product of this reaction.
10. What happens to the phosphate group during the formation of fructose-6-phosphate?
A.
It is removed completely
B.
It remains attached during the rearrangement
C.
It is replaced by two phosphate groups
D.
It is transferred to ATP
Correct Answer:
It remains attached during the rearrangement
Explanation:
The phosphate group remains attached to the sugar while glucose-6-phosphate is rearranged into fructose-6-phosphate.
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