Aerobic Cellular Respiration

Packet #13Chapter #4

Introduction

The goal of aerobic cellular respiration is to produce energy, in the form of ATP, by breaking the foods that one eats with the use of oxygen. ATP Adenosine Tri-

phosphate

Aerobic cellular respiration has three major steps Glycolysis The Kreb’s Cycle Oxidative

Phosphorylation(Electron Transport Chain)

Introduction II

During the processes of cellular respiration, ATP is produced via two methods Substrate Level

Phosphorylation Oxidative

Phosphorylation

Substrate Level Phosphorylation

Substrate level phosphorylation The removal of

phosphate, from a substrate, and adding it to ADP. ADP + P ATP

Requires the use of an enzyme.

Occurs during glycolysis and the Kreb’s Cycle

Oxidative Phosphorylation

Oxidative phosphorylation Occurs at the electron

transport chain. Requires the use of

oxygen. Molecules known as

NADH (nicotinamide adenine dinulceotide), or FADH (flavin adenine dinucleotide) are oxidized. NADH and FADH donate

electrons to the ETC and are eventually used to produce H2O from the oxygen that breathed in by the organism.

Oxidative Phosphorylation II

Oxidative phosphorylation After those events have

occured, ATP is produced via an underlying process known as chemiosmosis. Chemiosmosis occurs

during oxidative phosphorylation.

1 NADH 3 ATP’s 1 FADH 2 ATP’s

The Processes of Aerobic Cellular Respiration

Glycolysis

Glycolysis is a ten step process, occurring in the cytosol of the cell, that splits glucose in two molecules (pyruvate) while producing limited amounts of ATP (substrate level phosphorylation) and NADH. Glyco – sugar Lysis – split apart

The Kreb’s Cycle

The Kreb’s Cycle, occurring in the mitochondria matrix, is an eight step process that produces limited amounts of ATP (via substrate level phosphorylation), FADH and NADH.

Oxidative Phosphorylation

The electron transport chain is found along the inner membrane of the mitochondria and IS the location for oxidative phosphorylation.

Electrons are removed from the previously produced NADH and FADH.

The electrons, move along the chain causing hydrogen ions to move.

The hydrogen ions, that moved, drives ATP synthase to produce ATP (chemiosmosis). 1 NADH 3 ATP’s 1 FADH 2 ATP’s

Final Overview

As a result of aerobic cellular respiration a total of 36 – 38 ATP’s per glucose molecule. 4 ATP’s via substrate

level phosphorylation

Review

Review