Ch 9 Cellular Respiration and Fermentation€¦ · PPT file · Web view2014-05-05 · Title: Ch 9...

1 Review What happens to pyruvic acid in the Krebs cycle

Interpret Visuals Look at the diagram of the Krebs cycle. List all the products that are made and include what happens to each one

2 Review How does the ETC use the high energy electrons from glycolysis and the Krebs cycle

Relate Cause and Effect How does the cell use the charge differences that build up across the inner mitochondrial membrane during cellular respiration

CH 9 CELLULAR RESPIRATION AND FERMENTATION

9.2 The Process of Cellular Respiration

Glycolysis First stage of cellular

respiration Glucose is broken

down into 2 molecules of the 3-carbon molecule pyruvic acid

ATP and NADH are produced.

Glycolysis Cells “deposits” 2 ATP

to start glycolysis.

Glycolysis

Produces 4 ATP molecules Net gain of 2 ATP for each

glucose.

Glycolysis

NAD+ accepts a pair of high-energy electrons and becomes NADH Happens twice Goes to ETC.

Glycolysis

Produces ATP very fast Does not need oxygen.

Krebs Cycle

Pyruvic acid is broken down into carbon dioxide

A.k.a. Citric Acid Cycle ATP is produced.

Krebs Cycle 1 Pyruvic acid from

glycolysis enters the matrix of the mitochondrion.

Krebs Cycle 2 Enzymes split CO2 off

from pyruvic acid Leaves 2 carbon

molecule NADH is produced form

NAD+.

Krebs Cycle 3 2 carbon molecule joins

a 4 carbon molecule to make citric acid.

Krebs Cycle 4 Citric acid (6 carbon)

becomes a 4 carbon molecule

More NADH and CO2 are made.

Krebs Cycle 5 More reactions capture

energy as ATP, NADH, and FADH2.

Krebs Cycle 6

4 carbon molecule goes through cycle again.

Krebs Cycle

Each glucose molecule will make two turns of the Krebs cycle

Each glucose molecule will make 2 ATP molecules 8 NADH molecules 2 FADH2.

Electron Transport

NADH and FADH2 pass their electrons to ETC.

Electron Transport

Electrons combine with H+ ions and oxygen to form water at end of ETC.

Electron Transport

The high energy electrons move H+ ions against a concentration gradient across the inner mitochondrial.

Electron Transport

H+ ions pass back through the ATP synthase causing it to spin

ATP synthase attaches a phosphate to ADP to produce ATP with each rotation.

Energy Totals Complete breakdown

of glucose through cellular respiration results in the production of 36 ATP molecules

The rest of the energy is “lost” as heat (64%).