biology : class11 Triose Phosphate Isomerization : Location, Steps, Products, ATP Yield : Glycolysis MCQ Questions and Answers
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Triose Phosphate Isomerization
MCQ questions and answers.
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MCQ Questions
1. Which enzyme catalyzes the isomerization of dihydroxyacetone phosphate into glyceraldehyde-3-phosphate?
A.
Triose phosphate isomerase
B.
Hexokinase
C.
Phosphofructokinase
D.
Pyruvate kinase
Correct Answer:
Triose phosphate isomerase
Explanation:
Triose phosphate isomerase catalyzes the reversible conversion of dihydroxyacetone phosphate into glyceraldehyde-3-phosphate.
2. Which two compounds are interconverted during triose phosphate isomerization?
A.
Glucose-6-phosphate and fructose-6-phosphate
B.
Dihydroxyacetone phosphate and glyceraldehyde-3-phosphate
C.
Fructose-1,6-bisphosphate and pyruvate
D.
Glucose and glucose-6-phosphate
Correct Answer:
Dihydroxyacetone phosphate and glyceraldehyde-3-phosphate
Explanation:
Triose phosphate isomerization interconverts the two three-carbon phosphates, dihydroxyacetone phosphate and glyceraldehyde-3-phosphate.
3. What is the main purpose of triose phosphate isomerization in glycolysis?
A.
To convert both three-carbon products into glyceraldehyde-3-phosphate
B.
To split glucose into two six-carbon molecules
C.
To convert pyruvate into glucose
D.
To remove phosphate from fructose
Correct Answer:
To convert both three-carbon products into glyceraldehyde-3-phosphate
Explanation:
The reaction converts dihydroxyacetone phosphate into glyceraldehyde-3-phosphate, allowing both three-carbon molecules to continue through glycolysis in the same form.
4. Which product of the splitting of fructose-1,6-bisphosphate is directly converted into glyceraldehyde-3-phosphate?
A.
Dihydroxyacetone phosphate
B.
Pyruvate
C.
Glucose-6-phosphate
D.
Acetyl-CoA
Correct Answer:
Dihydroxyacetone phosphate
Explanation:
Dihydroxyacetone phosphate is converted into glyceraldehyde-3-phosphate by the enzyme triose phosphate isomerase.
5. What type of reaction is triose phosphate isomerization?
A.
Isomerization
B.
Hydrolysis
C.
Oxidative decarboxylation
D.
Phosphorylation using ATP
Correct Answer:
Isomerization
Explanation:
The reaction rearranges the atoms within a three-carbon phosphate molecule, converting one isomer into another.
6. How many carbon atoms are present in each molecule involved in triose phosphate isomerization?
A.
Two
B.
Three
C.
Four
D.
Six
Correct Answer:
Three
Explanation:
Both dihydroxyacetone phosphate and glyceraldehyde-3-phosphate are three-carbon triose phosphates.
7. Which molecule continues directly into the next stage of glycolysis after triose phosphate isomerization?
A.
Glyceraldehyde-3-phosphate
B.
Dihydroxyacetone phosphate
C.
Fructose-1,6-bisphosphate
D.
Glucose-6-phosphate
Correct Answer:
Glyceraldehyde-3-phosphate
Explanation:
Glyceraldehyde-3-phosphate proceeds to the subsequent reactions of glycolysis, while dihydroxyacetone phosphate is first converted into it.
8. Triose phosphate isomerase converts dihydroxyacetone phosphate into which type of compound?
A.
A three-carbon phosphate
B.
A six-carbon sugar
C.
A two-carbon acid
D.
A four-carbon phosphate
Correct Answer:
A three-carbon phosphate
Explanation:
The reaction preserves the three-carbon phosphate nature of the molecule while changing its arrangement to form glyceraldehyde-3-phosphate.
9. Which statement about the triose phosphate isomerization reaction is correct?
A.
It converts glyceraldehyde-3-phosphate into dihydroxyacetone phosphate only.
B.
It converts dihydroxyacetone phosphate into glyceraldehyde-3-phosphate.
C.
It converts glucose directly into pyruvate.
D.
It adds two phosphate groups to glucose.
Correct Answer:
It converts dihydroxyacetone phosphate into glyceraldehyde-3-phosphate.
Explanation:
In glycolysis, triose phosphate isomerase converts dihydroxyacetone phosphate into glyceraldehyde-3-phosphate so it can continue through the pathway.
10. Why is triose phosphate isomerization important after the six-carbon sugar is split in glycolysis?
A.
It makes both three-carbon products identical for the later reactions.
B.
It joins the two three-carbon products into one six-carbon molecule.
C.
It changes the three-carbon products into carbon dioxide.
D.
It removes all phosphate groups from the products.
Correct Answer:
It makes both three-carbon products identical for the later reactions.
Explanation:
The split produces dihydroxyacetone phosphate and glyceraldehyde-3-phosphate; isomerization converts the former into the latter, enabling both to follow the same subsequent reactions.
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