Cellular Respiration Overview

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Questions and Answers

What is the main product of glycolysis?

2 Acetyl CoA
2 pyruvate molecules (correct)
2 FADH₂
6 NADH

Where does the Krebs cycle take place?

In the endoplasmic reticulum
In the cytoplasm
In the inner mitochondrial membrane
In the mitochondrial matrix (correct)

Which stage of cellular respiration directly produces ATP through the flow of hydrogen ions?

Electron Transport Chain (correct)
Krebs Cycle
Link reaction
Glycolysis

What is the final electron acceptor in the process of cellular respiration?

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

What happens in the absence of oxygen during cellular respiration?

<p>Electron Transport Chain stops functioning (D)</p> Signup and view all the answers

Flashcards

Glycolysis

The first stage of cellular respiration that breaks down glucose into two pyruvate molecules. It occurs in the cytoplasm and produces a small amount of ATP and NADH.

Link Reaction

The process that converts pyruvate into acetyl CoA, which then enters the Krebs cycle. It occurs in the mitochondrial matrix and produces NADH.

Krebs Cycle

A series of chemical reactions that occur in the mitochondrial matrix. It utilizes acetyl CoA to produce ATP, NADH, and FADH2.

Electron Transport Chain

A series of protein complexes embedded in the inner mitochondrial membrane. It uses electrons from NADH and FADH2 to pump hydrogen ions across the membrane, creating a proton gradient.

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Chemiosmosis

The process of ATP production driven by the flow of hydrogen ions back across the inner mitochondrial membrane through ATP synthase. Oxygen acts as the final electron acceptor, forming water.

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Study Notes

Cellular Respiration

Glucose is the starting material for cellular respiration.
Glycolysis occurs in the cytoplasm, producing 2 ATP and 2 NADH.
Pyruvate is converted to Acetyl CoA, releasing 2 NADH.
Acetyl CoA enters the Krebs Cycle.
The Krebs Cycle occurs in the mitochondrial matrix; producing 2 ATP, 6 NADH, and 2 FADH₂.
Electron transport chain and chemiosmosis takes place on the inner mitochondrial membrane, using the NADH and FADH₂ to produce a large amount ATP.
Oxygen is the final electron acceptor in the electron transport chain.
Fermentation occurs in the absence of oxygen. This produces a small amount ATP, and sometimes alcohol or lactic acid.