Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 8, Problem 1MC

Which of the following is True for one glucose molecule?

  1. a. Fermentation produces 2 ATP.
  2. b. Glycolysis followed by fermentation nets 4 ATP.
  3. c. Ethanol is one end product of glycolysis.
  4. d. The overall equation for photosynthesis is the reverse of that for aerobic glucose breakdown.
Expert Solution & Answer
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Summary Introduction

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.

Conclusion

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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Students have asked these similar questions
Which of the following is an incorrect statement about the Calvin cycle? A.The main inputs to the reactions are NADPH, ATP, and CO2. B.The main outputs of the reactions are NADP+ , ADP, and sugar. C.More NADPH is used than ATP during the Calvin cycle. D.Carbon fixation is the first step of the process
If 30 molecules of CO2 enter the Calvin Cycle,a. How many molecules of phosphoglycerate (PGA) will be produced? b. How many molecules of glyceraldehyde phosphate (PGAL) leave the cycle? c. How many molecules of ribulose bisphosphate (RuBP) will be produced? d. How many molecules of ATP will be utilized?
For each process labeled a-e below, clearly indicate: i. whether it occurs in a plant cell, animal cell or both ii. whether the process occurs in the cytoplasm, mitochondrial matrix, mitochondrial inner membrane, chloroplast stroma or thylakoids. a. Glycolysis b. Calvin cycle c. Light reaction d. Citric acid cycle e. Electron transport chain

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