ch 9 cellular respiration and fermentation€¦ · ppt file · web view2014-05-05 · title: ch 9...
TRANSCRIPT
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%).