Krebs Cycle Quiz

Questions and Answers

What is the primary function of the Krebs cycle?

To convert glucose into pyruvate

To transport oxygen in the blood

To produce energy through the oxidation of acetyl-CoA (correct)

To synthesize proteins from amino acids

Which compound enters the Krebs cycle to initiate the process?

Fructose

Lactate

Acetyl-CoA (correct)

Glucose

Which of the following is a product of the Krebs cycle?

NADH (correct)

Pyruvate

Glucose

Fatty acids

How many cycles of the Krebs cycle occur for each molecule of glucose metabolized?

<p>2</p> Signup and view all the answers

What is the main purpose of the electron carriers produced during the Krebs cycle?

<p>To shuttle electrons to the electron transport chain</p> Signup and view all the answers

Study Notes

Krebs Cycle Overview

The primary function of the Krebs cycle is to produce energy through the oxidation of acetyl-CoA, generating high-energy electron carriers and ATP.
The cycle contributes to cellular respiration by breaking down organic molecules, ultimately aiding in the production of adenosine triphosphate (ATP).

Initiating Compound

Acetyl-CoA is the compound that enters the Krebs cycle, derived from carbohydrates, fats, and proteins through metabolic processes.

Products of the Krebs Cycle

The Krebs cycle produces several significant compounds:
- Carbon dioxide (CO2) - a waste product expelled from the cell.
- NADH and FADH2 - high-energy electron carriers that are crucial for the electron transport chain.
- A small amount of ATP.

Cycle Throughput per Glucose

For each molecule of glucose metabolized, two cycles of the Krebs cycle occur. This is because each glucose molecule is split into two pyruvate molecules, with each pyruvate resulting in one cycle.

Role of Electron Carriers

The main purpose of the electron carriers (NADH and FADH2) produced during the Krebs cycle is to transport high-energy electrons to the electron transport chain, where their energy is harnessed to produce ATP through oxidative phosphorylation.

Description

Test your knowledge of the Krebs cycle with this quiz that covers its primary functions, key compounds, and products. Understand the significance of electron carriers and the number of cycles related to glucose metabolism. Perfect for biology students and enthusiasts!