
Concept explainers
Which of the following is True for one glucose molecule?
- a. Fermentation produces 2 ATP.
- b. Glycolysis followed by fermentation nets 4 ATP.
- c. Ethanol is one end product of glycolysis.
- d. The overall equation for photosynthesis is the reverse of that for aerobic glucose breakdown.

Introduction:
Glucose metabolism is a cycle of biological processes which can break down glucose molecules to obtain ATPs. Glycolysis is a part of glucose metabolism that forms four ATPs among which two are re-used and thus yields a net gain of two ATP molecules. Photosynthesis is a process in which chloroplasts capture light energy from sun and converts into chemical energy of food.
Answer to Problem 1MC
Correct answer:
The overall equation for photosynthesis is the reverse of that for aerobic glucose breakdown is true for glucose molecule. Therefore, option (d) is correct.
Option (d) is given as “The overall equation for photosynthesis is the reverse of that for aerobic glucose breakdown”.
Explanation of Solution
Justify reason for the correct statement:
In photosynthesis, chloroplasts capture light energy from the sun and convert it into chemical energy. This energy is further used as food or stored as sugar in the plant in this process, the formation of glucose molecule and oxygen takes place in the presence of light. Chemical equation of photosynthesis best describes that complete glucose breakdown is a reverse of glucose formation in photosynthesis.
Hence, option (d) is correct.
Justify reasons for incorrect statements:
Option (a) is given as “Fermentation produces 2 ATP”.
Fermentation produces 2 ATP molecules in anaerobic condition. During fermentation, pyruvate is converted into lactate or ethanol and carbon dioxide. Hence it is a wrong answer.
Option (b) is given as “Glycolysis followed by fermentation nets 4 ATP”.
Glycolysis produces 4 ATPs from that two are re-used and yields a net gain of two ATP molecules. Hence it is a wrong answer.
Option (c) is given as “Ethanol is one end product of glycolysis”.
Ethanol is one end product of fermentation not of the glycolysis. The end product of glycolysis is pyruvate. Hence it is a wrong answer.
Hence, options (a), (b), and (c) are incorrect.
During photosynthesis, chemical energy is stored as the glucose molecules, while during glucose breakdown that energy is released to generate ATP.
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Chapter 8 Solutions
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