8 Questions
What is the second stage of cellular respiration called?
The Krebs cycle
What is pyruvic acid broken down into during the Krebs cycle?
Carbon dioxide
What is another name for the Krebs cycle?
The citric acid cycle
Where does the Krebs cycle take place within the cell?
In the matrix of the mitochondrion
What molecule is formed when acetic acid is joined to coenzyme A?
Acetyl-CoA
What happens to pyruvic acid during the Krebs cycle?
Pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions.
What is formed when acetyl-CoA hands off the 2-carbon acetyl group during the Krebs cycle?
A 6-carbon molecule called citric acid is produced.
Where does the Krebs cycle begin within the mitochondrion?
The Krebs cycle begins when pyruvic acid passes through the two membranes of the mitochondrion and into the matrix.
Study Notes
Cellular Respiration
- The second stage of cellular respiration is called the Krebs cycle (or citric acid cycle).
The Krebs Cycle
- Pyruvic acid is broken down into Acetyl-CoA during the Krebs cycle.
- The Krebs cycle is also known as the citric acid cycle.
- The Krebs cycle takes place within the mitochondria, specifically in the mitochondrial matrix.
Acetyl-CoA Formation
- When acetic acid is joined to coenzyme A, it forms Acetyl-CoA.
Pyruvic Acid During the Krebs Cycle
- During the Krebs cycle, pyruvic acid is broken down into Acetyl-CoA, which then enters the cycle.
Citric Acid Cycle Process
- When acetyl-CoA hands off the 2-carbon acetyl group during the Krebs cycle, citric acid is formed.
Krebs Cycle Initiation
- The Krebs cycle begins within the mitochondrial matrix, where Acetyl-CoA is formed from pyruvic acid.
Test your knowledge of cellular respiration with this quiz on the Krebs cycle. Learn about the breakdown of pyruvic acid, energy-extracting reactions, and the role of oxygen in this vital stage of cellular respiration.
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