You get the point.

Cellular Energetics Unit Cellular respiration and Photosynthesis

Cellular Respiration (chapter 9) Cellular respiration involves the break down of food particles for energy. NOT BREATHING! Cellular respiration and fermentation are catabolic (energy-yielding) pathways. Redox (oxidation-reduction) reactions release energy when electrons move closer to electronegative atoms (more stable configuration). Electrons “fall” from organic molecules to oxygen during cellular respiration (aerobic). The “fall” of electrons during cellular aerobic respiration is stepwise, via NAD + and an electron transport chain.

Oxidation-Reduction Reactions

Electron shuttle: You have to admit That this is really fun!

Cellular Respiration (chapter 9), continued Respiration involves glycolysis, the Krebs cycle (citric acid cycle), and electron transport. Glycolysis harvests chemical energy by oxidizing glucose to pyruvate. The Krebs cycle completes the energy-yielding oxidation of organic molecules. The inner mitochondrial membrane (cristae) couples energy transport to ATP synthesis. Cellular respiration generates many ATP molecules for each sugar molecule it oxidizes.

2 ATP ATP Cellular Respiration Overview

Substrate level phosphorylation

Glycolysis overview

Glycolysis, detailed

Intermediate step (the formation of Acetyl CoA)

Cellular Respiration (chapter 9), continued Fermentation enables some cells to produce ATP without the help of oxygen (an inorganic electron acceptor molecule). Glycolysis and the Krebs cycle connect to many other metabolic pathways. Feedback mechanisms control cellular respiration.

Macromolecules Other than glucose Can be catabolized (obviously)

Feedback Inhibition

ATP

Cellular Respiration (chapter 9) Cellular respiration involves the break down of food particles for energy. NOT BREATHING! Cellular respiration and fermentation are catabolic (energy-yielding) pathways. Redox (oxidation-reduction) reactions release energy when electrons move closer to electronegative atoms (more stable configuration). Electrons “fall” from organic molecules to oxygen during cellular respiration (aerobic). The “fall” of electrons during cellular aerobic respiration is stepwise, via NAD + and an electron transport chain.

Cellular Respiration (chapter 9), continued Respiration involves glycolysis, the Krebs cycle (citric acid cycle), and electron transport. Glycolysis harvests chemical energy by oxidizing glucose to pyruvate. The Krebs cycle completes the energy-yielding oxidation of organic molecules. The inner mitochondrial membrane (cristae) couples energy transport to ATP synthesis. Cellular respiration generates many ATP molecules for each sugar molecule it oxidizes.

Cellular Respiration (chapter 9), continued Fermentation enables some cells to produce ATP without the help of oxygen (an inorganic electron acceptor molecule). Glycolysis and the Krebs cycle connect to many other metabolic pathways. Feedback mechanisms control cellular respiration.

Photosynthesis

Overview of Photosynthesis

Chlorophyll Structure

Non-cyclic electron flow

Cyclic electron flow

Chemiosmosis, Look familiar?

Thylakoid Membrane

Melvin Calvin