Biology Section 7-2 Flashcards
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Questions and Answers

What is the mitochondrial matrix?

The space inside the inner membrane of a mitochondrion.

What is acetyl CoA?

A molecule formed when pyruvic acid reacts with coenzyme A.

What is the Krebs cycle?

A biochemical pathway that breaks down acetyl CoA, producing CO2, hydrogen atoms, and ATP.

What is citric acid?

<p>A six-carbon compound produced from acetyl CoA and oxaloacetic acid.</p> Signup and view all the answers

In what part of a mitochondrion does the Krebs cycle occur?

<p>The mitochondrial matrix.</p> Signup and view all the answers

In what part of a mitochondrion is the electron transport chain located?

<p>The inner mitochondrial membrane.</p> Signup and view all the answers

What four-carbon compound is regenerated at the end of the Krebs cycle?

<p>Oxaloacetic acid.</p> Signup and view all the answers

What molecule does oxygen become a part of at the end of the electron transport chain?

<p>Water.</p> Signup and view all the answers

Is cellular respiration more efficient than fermentation?

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

List the two processes that together result in cellular respiration.

<p>Glycolysis and aerobic respiration.</p> Signup and view all the answers

Study Notes

Mitochondrial Functions

  • The mitochondrial matrix is the region located inside the inner membrane of mitochondria where metabolic reactions occur.
  • Acetyl CoA is formed when pyruvic acid entering the mitochondrial matrix reacts with coenzyme A.

Krebs Cycle

  • The Krebs cycle, also known as the citric acid cycle, is a critical biochemical pathway that processes acetyl CoA to produce carbon dioxide (CO2), hydrogen atoms, and adenosine triphosphate (ATP).
  • The cycle begins with the combination of acetyl CoA and oxaloacetic acid, leading to the formation of a six-carbon compound known as citric acid.

Locations of Cellular Processes

  • The Krebs cycle takes place in the mitochondrial matrix, where various enzymatic reactions occur.
  • The electron transport chain, responsible for electron transfer reactions and ATP production, is found in the inner mitochondrial membrane.

Cycle Regeneration and Products

  • At the conclusion of the Krebs cycle, oxaloacetic acid is regenerated, allowing the cycle to continue functioning efficiently.
  • At the end of the electron transport chain, oxygen is utilized to combine with hydrogen, forming water as a byproduct.

Comparison of Respiration Processes

  • Cellular respiration is a more efficient process for energy production compared to fermentation, enabling organisms to utilize glucose fully in the presence of oxygen.
  • Cellular respiration encompasses two main processes: glycolysis and aerobic respiration, essential for generating energy in cells.

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Test your knowledge of key terms in Biology Section 7-2 with these flashcards. This section covers essential concepts such as the mitochondrial matrix, acetyl CoA, and the Krebs Cycle. Perfect for students looking to reinforce their understanding of cellular respiration.

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