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AEROBIC RESPIRATION EXAM QUESTIONS AND ANSWERS 2024
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AEROBIC RESPIRATION EXAM
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AEROBIC RESPIRATION EXAMWhat is the formula for aerobic respiration? - answer Glucose + Oxygen ---> Carbon
Dioxide + Water
C6H12O6 + 6O2 ----> 6CO2 + 6H2O
-aerobic respiration in cells involves many steps, each catalyzed by a specific enzyme
What are the inputs and outputs of aerobic respiration? - answer Inputs: ADP + Pi,
Oxygen, Glucose
Outputs: ATP, Water, Carbon dioxide
What is the source of glucose? Why is it needed? - answer-Food or the output of the
LIS of photosynthesis
-It is a high energy sugar and source of energy that is transferred to ATP
What is the source of oxygen? Why is it needed? - answer-air and water
-O is the final electron acceptor at the end of an electron transport chain
-in accepting electrons, O also captures H ions and the net result is the production of
water
-O2 + 4e- + 4H+ ---> 2H2O
GLYCOLYSIS: FIRST STAGE Where and what happens? - answerWHERE: in the
cytosol of the cells, enzymes involved are in the solution in the cytosol
WHAT: one molecule of glucose is broken down into two molecules of a 3-C compound
(pyruvate). A net release of energy occurs and some is used directly to produce two
molecules of ATP. 2 H are removed resulting in 2 loaded NADH acceptor molecules
used later in ATP production
KREBS CYCLE: SECOND STAGE - answerWHERE: mitochondria
WHAT: Pyruvate molecules leave the cytosol and enter mitochondria where they react
forming acetyl-CoA. 1 loaded NADH is formed
Acetyl-CoA enters the Krebs cycle
For each molecule of acetyl-CoA that passes through Krebs cycle, 3 molecules of CO2
are formed
as cycle continues, H atoms are gathered by acceptor molecules with 4 loaded acceptor
molecules formed for each acetyl-CoA
ELECTRON TRANSPORT: THIRD STAGE - answerWHERE: inner membranes of
mitochondria
WHAT: electrons from loaded acceptors are brought to the inner membranes and
accepted by enzyme complexes of electron transport chain
electrons are successively transferred along the chain until finally accepted by oxygen
-enzyme complexes are reduced as they accept an electron and are oxidised as they it
onto to the next carrier
-electron transport releases energy used for production of ATP
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