Complete AQA A Level Biology notes on respiration with diagrams, definitions to support your understanding.
Details include:
Glycolysis
Link reaction
Krebs cycle
Oxidative phosphorylation
Alternative respiratory substrates
Anaerobic respiration
Glycolysis
First stage of aerobic and anaerobic respiration
Occurs in cytoplasm
Split Gcarbon glucose into 2 3 carbon pyruvate
Glucose
carbon
atom
I
ATP ATP
ADPtPi ApptPi
CYTOPLASM Phosphorylated Glucose
9
poop prevents diffusion AND
I
P
1P y cellmembrane
makesmore reactive
Triose Phosphate L
Those Phosphate
agg
oxidised oxidised
NAD NAD
Reduced
NAD
2K
C NAD
2h
Reduced
2Pi12A
f2Pit2ADP
2ATPC 2ATP
Pyruvate pyruvate
, ymu l lym
Activation of glucose
by phosphorylation
Splitting of the phosphorylated glucose to produce triodephosphateCTP
Oxidation of thosephosphate to pyruvate
Production of ATP by substratelevelphosphorylation and reduced NAD
Energy Yields from Glycolysis
Netgain of 2 ATP
2 reduced NAD provideenergy for more ATP in oxidative phosphorylation
2 pyruvate
Glycolysis does not require Oz
Pyruvate produced can be converted to lactate or ethanol in anaerobic
respiration
link Reaction
Pyruvate enters mitochondrial matrix by activetransport
Pyruvate oxidised to form acetate 12C
Oz and 2Htlost decarboxylation and dehydrogenation
oxidisedNADto produce reduced NAD
accepted
by
Acetate combines woth coenzyme A to produce compoundcalled acetylcoenzymeA
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