Transcript Aerobic vs. Anaerobic respiration

Aerobic vs. Anaerobic respiration
Objectives:
 Review the two types of anaerobic respiration.
 Explain the specific steps of alcohol & lactic acid fermentation.
 Compare & contrast aerobic & anaerobic respiration.
Aerobic respiration requires oxygen.
Oxygen present
Alcohol fermentation converts
pyruvate into ethyl alcohol.
Glucose
NAD+
2 ATP
2
Pyruvate
NADH
e
CO2
C
2 Ethyl alcohol
NAD+
Yeast use alcohol fermentation to break
down glucose when oxygen is absent.
 Produces CO2 and alcohol
 Live yeast: undergoing anaerobic fermentation
 Breaking down glucose to form 2ATP
 Dead yeast: cannot undergo anaerobic fermentation
 Proteins necessary for reaction broken down due to change
in temperature.
 Enzymes (proteins) only work at specific temperatures!
Alcohol fermentation is used to make
wine, beer, & bread.
 CO2 helps bread rise
 Alcohol production
for wine & beer
Glycolysis does not require oxygen.
Glucose
NAD+
2 ATP
2
Pyruvate
NADH
When O2 continues
on with cellular respiration
to be converted into
Acetyl CoA
When oxygen is absent, anaerobic
respiration occurs.
Two types:
 Alcohol fermentation
 Lactic acid fermentation
 Both utilize glycolysis to produce ATP
 Make very little ATP, 2 per glucose
Lactic acid fermentation turns
pyruvate into lactic acid.
Glucose
NAD+
2 ATP
2
Pyruvate
NADH
e
2 Lactic acid
NAD+
Lactic acid fermentation causes
muscles to burn during exercise.
• When exercise too much or too
quickly muscles use lactic acid
fermentation.
• Build up of acid causes muscles
to burn.
• Occurs in animals
Similarities & differences between
anaerobic aerobic respiration.
Anaerobic
 Uses glycolysis to
produce ATP
 Produces 2 ATP per
glucose
 Does not require oxygen
 Occurs in prokaryotes
Aerobic
 Uses glycolysis, Kreb
cycle, & electron
transport chain to
produce ATP
 Produces 32-38 ATP per
glucose
 Requires oxygen
 Occurs in eukaryotes
Key points
 Anaerobic respiration can be used when oxygen isn’t available
to allow production of ATP.
 Anaerobic respiration has many commercial applications.
 Aerobic respiration is more efficient at producing ATP but its
requires oxygen.