Cellular Respiration

Do Now:

1. Take out homework

2. What do you think “respiration” is? Is it the same as “cellular respiration?”

Cellular Respiration

• Is a complex biochemical pathway that breaks down chemicals in order to make ATP.

How ATP Works

Adenine

Ribose

P P P

ATP = stored EnergyEnergy to use

ADP = used Energy (like a dead rechargeable battery)Think “D” = “D”ead.

TRI phosphateDI phosphate Pi

There are two main types of respiration

• Aerobic respiration requires oxygen

• Anaerobic respiration does not require oxygen.

Cellular Respiration Overview

Organic Compounds e.g. C6H12O6

Glycosis

FermentationCitric Acid

(Krebs) Cycle

Electron Transport

Chain

Lactic Acid Ethanolic

Anaerobic Aerobic

Chemiosmosis

= # ATP made per glucose molecule

World Changing

• About 2.5 Billion years ago, life on Earth changed forever…

• Paleontologists mark this time as the change from the Archaen Era to the Proterozoic.

• About 90% of the species of organisms alive went extinct in a terrible catastrophe…

• What was it???

Photosynthesis Makes Oxygen!

Aerobic respiration, made possible by photosynthesis, produces almost 2,000% more energy than anaerobic!

That’s a lot of ATP! This allows for the diversification of life – and the rise of the Eukaryotes 1.8 BYA

Aerobic Respiration is what YOU (and other complex organisms) do.

Key Concepts• Cellular Respiration

• How ATP works– ATP ADP + P + Energy

• Aerobic Respiration – glycolysis Citric Acid Cycle Electron Transport Chain Chemiosmosis

• Anaerobic Respiration– Glycolysis Fermentation

• Aerobic respiration is almost 20x more efficient than anaerobic.– There’s a reason that there’s no such thing as a

multicellular anaerobe.