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Chapter 11: Respiration (Total Energy Yield of Respiration (aerobic…
Chapter 11: Respiration
Types of Respiration
anaerobic
glycolysis
glucose is broken down
pyruvate
abundant when needed
expensive
toxic product
lactate
acetaldehyde
abundant when needed
expensive
toxic product
ethanol
oxygen
usually abundant when needed
cheap
nontoxic product
water
no oxygen required
integral metabolism
photoautotrophs
plants
uses calvin cycle
green bacteria
cyanobacteria
some purple bacteria
conventional heterotrophs
animals
take in organic substances
ATP generation
polymer construction
photoheterotrophs
photosynthetic bacteria
food available
light available
most purple bacteria
green bacteria
aerobic
citric acid cycle
pyruvate not needed
products
CO2
O2
NADH
acetyl CoA
oxygen required
heat generated
cyanide-resistant
thermogenetic
ATP generation is blocked
pentose phosphate pathway
similar to glycolysis
respiration of lipids
beta oxidization
photorespiration
RuBP carboxylase adds O2 instead of CO2
Environmental & Internal Factors
temperature
lack of oxygen
internal regulation
Total Energy Yield of Respiration
anaerobic
2 ATP ---> 2 ATP
aerobic
glycolysis
2 ATP ---> 2 ATP
2 NADH ---> 4 or 6 ATP ---> 4 or 6 ATP
pyruvate/acetyl CoA
1 NADH ---> 3 ATP (x2) ---> 6 ATP
citric acid cycle
1 ATP (x2) ---> 2 ATP
3 NADH ---> 9 ATP (x2) ---> 18 ATP
1 FADH2 ---> 2 ATP (x2) ---> 4 ATP
pentose phosphate pathway
2 to 6 NADH ---> 0 to 12 ATP
heat generated
none
liquid
variable
photorespiration
none
Respiratory Quotient
glucose
C6H12O6 ---> 6O2 + 6H2O
RQ = 6CO2/6O2 = 1.0
lipid
C18H34O2 ---> 18 CO2 +17 H2O
RQ = 18CO2/25.50(2) = .7
fermentation
C6H12O6 ---> alcohol + CO2
NoO2 consumption
citric acid
C6H8O7 + 4.50(2) ---> 6CO2 + 4H2O
RQ = 6CO2/4.50(2) = 1.33
Fermentation of Alcoholic Beverages
beer
fermented starchy cereal grains
barley
wheat
corn
rice
3% - 6% ethanol
wine
fermented sugar rich fruit juices
grapes
elderberry
peach
12% - 14% ethanol
spirits
ethanol content above 20%
distilled