Cell Respiration: Glycolysis, Krebs Cycle & ATP
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Questions and Answers

Which statement is NOT accurate regarding cellular respiration?

  • It consists of glycolysis, the Krebs cycle, and the electron transport chain.
  • Most ATP is produced during cell respiration as a result of the electron transport chain and chemiosmosis.
  • All plant and animal cells carry out respiration at all times.
  • It is an oxidative process.
  • Oxygen molecules are pumped across the cristae membrane to the outer compartment. (correct)

Which of the following accurately describes the process of glycolysis?

  • Generates carbon dioxide as a primary product.
  • Involves an electron transport chain to generate ATP.
  • Is the breakdown of glucose to produce pyruvic acid. (correct)
  • Produces water as a byproduct.
  • Directly requires oxygen to proceed.

Within a eukaryotic cell, where is the electron transport chain primarily located?

  • Cytoplasm
  • Cristae of the mitochondria (correct)
  • Golgi body
  • Inner matrix of mitochondria
  • Outer compartment of mitochondria

In cellular respiration, approximately how many ATP molecules can each NADH molecule theoretically generate when it delivers protons and electrons to the electron transport chain?

<p>3 (A)</p> Signup and view all the answers

What is the MOST crucial outcome of the entire process of cellular respiration?

<p>ATP is produced. (E)</p> Signup and view all the answers

Which term defines the process of losing electrons by a molecule, atom, or ion?

<p>Oxidation (D)</p> Signup and view all the answers

What is the immediate result of the function of the electron transport chain in cellular respiration?

<p>A proton gradient is created (A)</p> Signup and view all the answers

After glycolysis and before the Krebs cycle, pyruvic acid is converted to:

<p>Acetyl-CoA (D)</p> Signup and view all the answers

What is the primary role of oxygen in aerobic respiration?

<p>To act as the final acceptor of protons and electrons in the electron transport chain. (D)</p> Signup and view all the answers

Which of the following are waste products of aerobic cellular respiration?

<p>Water and carbon dioxide only. (C)</p> Signup and view all the answers

In the sequence $Glucose \rightarrow \text{Process A} \rightarrow \text{Process B} \rightarrow \text{Process C} \rightarrow CO_2 + H_2O$, what does Process A represent?

<p>Glycolysis (C)</p> Signup and view all the answers

Where does Process A (Glycolysis) occur in a eukaryotic cell?

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

Which of the following statements about the processes in aerobic respiration (A, B, and C) is correct?

<p>Process A (Glycolysis) requires energy input. (B)</p> Signup and view all the answers

Which statement is accurate regarding process C, the electron transport chain?

<p>The membrane structure ATP synthase is involved. (B)</p> Signup and view all the answers

Which of the following statements is true regarding process B, the Krebs cycle?

<p>It releases carbon dioxide. (B)</p> Signup and view all the answers

Flashcards

Role of Oxygen in Respiration

The final acceptor of protons and electrons in the electron transport chain.

Waste Products of Respiration

Carbon dioxide and water are waste products of aerobic cellular respiration.

Process A in Respiration

Glycolysis, the breakdown of glucose.

Location of Glycolysis

The cytoplasm.

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Process C in Respiration

The electron transport chain.

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Key Feature of the Electron Transport Chain

It involves the membrane structure ATP synthase.

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Key Feature of Krebs cycle

Process B releases carbon dioxide.

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First Evolved Process

Glycolysis.

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Glycolysis

The breakdown of glucose to produce 2 pyruvic acid molecules. Yields a net gain of 2 ATP and 2 NADH.

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Pyruvic Acid to Acetyl-CoA Conversion

Pyruvic acid is converted to Acetyl-CoA, yielding 2 NADH. This process links glycolysis to the Krebs cycle.

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Krebs Cycle

A series of reactions in the mitochondria that oxidizes Acetyl-CoA, producing ATP, NADH, and FADH2.

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Electron Transport Chain (ETC)

A series of protein complexes that transfer electrons, creating a proton gradient for ATP production.

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Chemiosmosis

The use of energy in a proton gradient to drive ATP synthesis.

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Cellular Respiration

A process that breaks down glucose to produce ATP, using glycolysis, the Krebs cycle, and the electron transport chain.

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Oxidation

The loss of electrons from a substance.

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Proton Gradient

Creates a high concentration of protons (H+) in the intermembrane space of the mitochondria.

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Study Notes

  • One glucose molecule undergoes complete breakdown during cell respiration in the presence of oxygen
  • The process results in the production of 36 ATP

Multiple-Choice Questions on Cell Respiration and Metabolism

  • Cell respiration is an oxidative process that all plant and animal cells perform consistently
  • Cell respiration consists of glycolysis, the Krebs cycle, and the electron transport chain

Glycolysis

  • Glycolysis is the breakdown of glucose to produce pyruvic acid

Electron Transport Chain

  • The electron transport chain is located in the cristae of the mitochondria

ATP Production

  • Each NADH molecule carrying protons to the electron transport chain can produce 3 molecules of ATP

Key Events in Cell Respiration

  • The most important result of cell respiration is creating a proton gradient.

Oxidation

  • The loss of electrons from a molecule is known as oxidation

Immediate Result of Electron Transport Chain

  • The immediate result of the electron transport chain is the production of water

Aerobic Respiration

  • Oxygen's role in aerobic respiration is to act as the final proton and electron acceptor in the electron transport chain

Waste Products

  • Waste products of aerobic cell respiration are carbon dioxide and water

Major Processes in Aerobic Respiration

  • Process A represents Glycolysis
  • Process A occurs in the Cytoplasm (the breakdown of glucose)
  • Process C represents the Electron Transport Chain
  • Process B releases carbon dioxide
  • Process C involves the membrane structure ATP synthase

Major Processes in Aerobic Respiration

  • Process A represents Glycolysis, so it occurs in the cytoplasm
  • Process A represents Glycolysis
  • Process B releases carbon dioxide
  • Process C represents the Electron Transport Chain, which involves the membrane structure ATP synthase

Energy Production

  • Process B produces energy by chemiosmosis

Evolution

  • Glycolysis likely evolved first

ATP Synthase

  • ATP synthase is not an important component of glycolysis
  • The function of ATP synthase depends on a proton gradient

Glucose Breakdown

  • The breakdown of glucose into pyruvic acid happens during glycolysis

Correctly Matched

  • Electron transport chain is correctly matched with cristae membrane

Muscle Fatigue

  • During strenuous exercise, skeletal muscles use up oxygen to produce large amounts of lactic acid, causing pain and fatigue

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Description

Explore cell respiration, an oxidative process in plant and animal cells. Includes glycolysis (glucose breakdown), the Krebs cycle, and the electron transport chain. Learn about ATP production and oxidation.

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