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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 7, Problem 11SQ
Textbook Problem
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_________ accepts electrons in alcoholic fermentation.

  1. a. Oxygen
  2. b. Pyruvate
  3. c. Acetaldehyde
  4. d. Ethanol

Summary Introduction

Introduction:

Fermentation reactions do not require oxygen as an electron acceptor, but the final electron acceptor is an organic molecule. It occurs under the anaerobic conditions. Fermentation reaction occurs in the cytoplasm of the cell. Alcoholic fermentation converts glucose to ethyl alcohol.

Explanation of Solution

Reason for the correct statement:

Glycolysis yields 2ATP, 2NADH, and 2 pyruvates. The pyruvate molecule produced after glycolysis undergoes the removal of one carbon as CO2. The fragment left is an organic molecule which is called acetaldehyde. The acetaldehyde accepts the electron and a hydrogen ion from NADH, it becomes ethanol.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “Oxygen”. Oxygen is the electron acceptor in the aerobic respiration, not in the alcoholic fermentation...

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