1. What is the net ATP yield of glycolysis from one molecule of glucose?
A.
1 ATP
B.
2 ATP
C.
4 ATP
D.
6 ATP
Correct Answer:
2 ATP
Explanation:
Glycolysis produces 4 ATP but uses 2 ATP, giving a net yield of 2 ATP per glucose molecule.
2. How many ATP molecules are produced directly during glycolysis before subtracting the ATP used?
A.
1 ATP
B.
2 ATP
C.
4 ATP
D.
8 ATP
Correct Answer:
4 ATP
Explanation:
Four ATP molecules are formed during glycolysis, but two ATP molecules are consumed in the early steps.
3. How many ATP molecules are consumed during the energy-investment phase of glycolysis?
A.
1 ATP
B.
2 ATP
C.
3 ATP
D.
4 ATP
Correct Answer:
2 ATP
Explanation:
Glycolysis uses 2 ATP molecules during its initial energy-investment phase.
4. If one glucose molecule undergoes glycolysis, what is the resulting net ATP gain?
A.
0 ATP
B.
2 ATP
C.
4 ATP
D.
6 ATP
Correct Answer:
2 ATP
Explanation:
The net ATP gain is 2 because 4 ATP are produced and 2 ATP are used.
5. What is the net ATP yield when two glucose molecules complete glycolysis?
A.
2 ATP
B.
4 ATP
C.
6 ATP
D.
8 ATP
Correct Answer:
4 ATP
Explanation:
Each glucose molecule gives a net yield of 2 ATP, so two glucose molecules yield 4 ATP.
6. Which expression correctly represents the net ATP yield of glycolysis per glucose molecule?
A.
2 ATP produced minus 4 ATP used
B.
4 ATP produced minus 2 ATP used
C.
4 ATP produced plus 2 ATP used
D.
2 ATP produced plus 4 ATP used
Correct Answer:
4 ATP produced minus 2 ATP used
Explanation:
The net yield is calculated by subtracting the 2 ATP invested from the 4 ATP produced.
7. What is the difference between the gross ATP production and the net ATP gain in glycolysis?
A.
1 ATP
B.
2 ATP
C.
3 ATP
D.
4 ATP
Correct Answer:
2 ATP
Explanation:
Glycolysis produces 4 ATP grossly but has a net gain of 2 ATP, so the difference is 2 ATP.
8. If glycolysis produces 4 ATP and uses 2 ATP, how many ATP remain as net gain?
A.
1 ATP
B.
2 ATP
C.
4 ATP
D.
6 ATP
Correct Answer:
2 ATP
Explanation:
Subtracting the 2 ATP used from the 4 ATP produced leaves a net gain of 2 ATP.
9. What is the total net ATP yield from glycolysis of three glucose molecules?
A.
3 ATP
B.
4 ATP
C.
6 ATP
D.
12 ATP
Correct Answer:
6 ATP
Explanation:
Since one glucose gives a net yield of 2 ATP, three glucose molecules give 3 × 2 = 6 ATP.
10. The net ATP yield of glycolysis is lower than its gross ATP production because glycolysis:
A.
Uses 2 ATP in its early steps
B.
Uses 4 ATP in its early steps
C.
Produces no ATP directly
D.
Uses 6 ATP in its early steps
Correct Answer:
Uses 2 ATP in its early steps
Explanation:
Two ATP are invested at the beginning of glycolysis, reducing the gross production of 4 ATP to a net gain of 2 ATP.
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