**Question:**During the citric acid cycle, 3 NADH and 1 FADH₂ molecules are formed. How many electrons are carried in these four carriers?**Options:**- 10- 5- 8- 7- 4**Explanation:**In the citric acid cycle, each NADH molecule can carry 2 electrons, and each FADH₂ molecule also carries 2 electrons. Therefore, the total number of electrons carried by these four carriers is:\[(3 \, \text{NADH} \times 2 \, \text{electrons}) + (1 \, \text{FADH₂} \times 2 \, \text{electrons}) = 6 + 2 = 8 \, \text{electrons}\]Thus, the correct answer is 8.

Answered: During the citric acid cycle, 3 NADH…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Introduction

Aerobic cellular respiration is a set of three basic metabolic processes that occur in cells to generate energy (ATP). The following are the three metabolic pathways in order:

Glycolysis
Citric acid cycle
Electron transport chain (ETC)

In aerobic respiration, processes take place in the presence of oxygen, and the citric acid cycle is one of the most important pathways, yielding ATP, GTP, NADH, and FADH2 molecules. The electron transport chain uses the NADH and FADH2 molecules to make additional ATP that may be used by the body for normal and physiological functions.

The citric acid cycle is a cyclic mechanism that starts with acetyl CoA and oxaloacetate and ends with oxaloacetate being regenerated.