AP Bio - Cellular Respiration Review
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Questions and Answers

What is the first phase of the cellular respiration process?

Glycolysis

What is the second phase of the cellular respiration process?

The Krebs Cycle

What is the third phase of the cellular respiration process?

Electron Transport Chain

Where in the cell does Glycolysis occur?

<p>The cytoplasm</p> Signup and view all the answers

Where in the cell does the Krebs Cycle occur?

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

Where in the cell does the Electron Transport Chain occur?

<p>The inner membrane of the mitochondria</p> Signup and view all the answers

How many ATP are made in the glycolysis part of cellular respiration?

<p>4 ATP total, and 2 net</p> Signup and view all the answers

How many ATP are made in the Krebs Cycle part of cellular respiration?

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

How many ATP are made in the electron transport part of cellular respiration?

<p>32-34 ATP</p> Signup and view all the answers

In which phase of cellular respiration is carbon dioxide made?

<p>The Krebs Cycle</p> Signup and view all the answers

In which phase of cellular respiration is water made?

<p>The electron transport chain</p> Signup and view all the answers

In which phase of cellular respiration is oxygen a substrate (an input)?

<p>The electron transport chain</p> Signup and view all the answers

In which phase of cellular respiration is glucose a substrate (an input)?

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

Only a small part of the energy released from the glucose molecule during glycolysis is stored in ATP. How is the rest of the energy released?

<p>It is released as heat</p> Signup and view all the answers

What are the 2 metabolic pathways a cell can use and what determines which pathway is used?

<p>Aerobic Cellular Respiration and Anaerobic Cellular Respiration. Depends upon the presence or absence of oxygen.</p> Signup and view all the answers

Why does glycolysis happen in the cytoplasm?

<p>Enzymes to convert glucose to pyruvate are present</p> Signup and view all the answers

What does the Krebs cycle happen in the mitochondrial matrix?

<p>Necessary enzymes are present there</p> Signup and view all the answers

Why does the electron transport chain happen in the inner membrane of the matrix?

<p>Necessary enzymes are present there</p> Signup and view all the answers

What are NAD+ and FAD? What do they do and what do they become?

<p>Hydrogen and electron carriers that carry the H+ and electrons to Electron Transport Chain to convert ADP + Pi to ATP. They become NADH and FADH2 when they pick up the hydrogens during Glycolysis (NADH only) and the Krebs Cycle.</p> Signup and view all the answers

What are the inputs of glycolysis?

<p>Glucose, 2 ATP, (NAD+) + H</p> Signup and view all the answers

What are the outputs of glycolysis?

<p>2 pyruvate, 4 ATP, 2 NADH</p> Signup and view all the answers

What are the inputs of intermediate?

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

What are the outputs of intermediate?

<p>2 CO2, 2 NADH, 2 acetyl CoA</p> Signup and view all the answers

What is the overall equation for cellular respiration?

<p>C6 H12 O6 + O2 ------&gt; CO2 + H2O</p> Signup and view all the answers

What are the inputs of the Krebs cycle?

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

What are the outputs of the Krebs cycle?

<p>6 NADH, 2 FADH, 2 ATP, 4 CO2</p> Signup and view all the answers

What are the inputs of the electron transport chain?

<p>10 NADH, 2 FADH, O2</p> Signup and view all the answers

What are the outputs of the electron transport chain?

<p>32-34 ATP, H2O</p> Signup and view all the answers

Where does intermediate take place?

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

Study Notes

Cellular Respiration Overview

  • Cellular respiration consists of three main phases: Glycolysis, Krebs Cycle, and Electron Transport Chain.

Glycolysis

  • Occurs in the cytoplasm of the cell.
  • Total of 4 ATP produced; net gain is 2 ATP after accounting for energy investment.
  • Involves input of glucose, 2 ATP, and NAD+.
  • Outputs include 2 pyruvate, 4 ATP, and 2 NADH.
  • Releases some energy as heat.

Krebs Cycle

  • Takes place in the mitochondrial matrix.
  • Consumes 2 acetyl CoA as input.
  • Outputs consist of 6 NADH, 2 FADH2, 2 ATP, and 4 CO2.
  • CO2 is produced during this phase.

Electron Transport Chain

  • Located in the inner membrane of the mitochondria.
  • Inputs include 10 NADH, 2 FADH2, and O2.
  • Generates 32-34 ATP and produces water (H2O) as a byproduct.
  • Oxygen serves as a substrate in this phase.

Energy Carriers

  • NAD+ and FAD are hydrogen and electron carriers.
  • They transport H+ and electrons to the Electron Transport Chain, transforming into NADH and FADH2 during Glycolysis and the Krebs Cycle.

Intermediate Stage

  • Located within the mitochondrion.
  • Begins with 2 pyruvate, resulting in 2 CO2, 2 NADH, and 2 acetyl CoA.

Key Equations

  • Overall equation of cellular respiration: C6H12O6 + O2 → CO2 + H2O.
  • Aerobic vs. Anaerobic Cellular Respiration is determined by the presence or absence of oxygen.

Enzyme Presence

  • Glycolysis occurs in the cytoplasm due to the presence of necessary enzymes.
  • The Krebs Cycle is facilitated by enzymes located in the mitochondrial matrix.
  • The Electron Transport Chain operates because needed enzymes are found in the inner mitochondrial membrane.

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Test your knowledge on the phases of cellular respiration with this AP Biology flashcard quiz. Covering key steps like Glycolysis, the Krebs Cycle, and the Electron Transport Chain, this resource is perfect for students preparing for exams. Challenge yourself to recall where each process occurs and solidify your understanding of cellular metabolism.

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