Unit 2 Lecture 10: Cellular respiration This video provides the content for your “Basics” class notes. It moves quickly, so pause it often while you write. Bring your notes to class.

Electron Energy

Respiration overview

The mitochondrion

Respiration overview

Glycolysis 1.Occurs in cytosol 2. Glucose has some electrons removed 3.Electrons are placed on NAD+ to make NADH 4.Some ATP is made by substrate level phosphorylation 5.End product is pyruvate

NAD+ as an electron shuttle NAD+ NADH Oxidized Reduced

Substrate level phosphorylation

Sample reactions in glycolysis

Glycolysis Fermentation

Glycolysis Fermentation

Citric acid cycle 1.Occurs in matrix 2.3-carbon sugar is oxidized to CO 2 3.Electrons are placed on NAD+ and FAD 4.Some ATP is made by substrate level phosphorylation

Other Fuels 1.Only carbohydrates go through glycolysis. 2.Fats and proteins enter cellular respiration at the end of glycolysis or the citric acid cycle.

Oxidative phosphorylation

Intermembrane space Matrix Electron Transport chain

Oxidative phosphorylation

Chemiosmosis

Substrate-level Phosphorylation vs Chemiosmosis

Relative ATP Production

Prep for Basics Quiz Can you do the following? Draw and label a mitochondrion Describe location and products of glycolysis, citric acid cycle, and electron transport chain Describe the function of electron shuttles and electron transport Compare substrate level phosphorylation and chemiosmosis Explain where the majority of ATP is produced in respiration Describe the basics of fermentation and when it is used