Exam (elaborations)
2024 AQA A LEVEL BIOLOGY – RESPIRATION EXAM WITH CORRECT ANSWERS
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2024 AQA A LEVEL BIOLOGY – RESPIRATION EXAM WITH CORRECT ANSWERS
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2024 AQA A LEVEL BIOLOGY –RESPIRATION EXAM WITH
CORRECT ANSWERS
What is the purpose of respiration ? - CORRECT-ANSWERSTo release energy
from glucose
To produce ATP
What is the general equation for aerobic respiration ? - CORRECT-
ANSWERS6O2 + C6H1206 --> 6H2O + 6CO2 + energy
What do plants need energy for ? (name 5) - CORRECT-ANSWERS1.
Photosynthesis
2. Active transport of minerals via roots
3. DNA replication,
4. Cell division,
5. Protein synthesis
What is the reduced NAD produced in glycolysis used for ? - CORRECT-
ANSWERSOxidative phosphorylation
What is the pyruvate produced in glycolysis used for ? - CORRECT-
ANSWERSActively transported into the mitochondrial matrix
Link reaction
Why does glycolysis take place in the cytoplasm ? - CORRECT-
ANSWERSGlucose can't cross the mitochondrial membrane
It's too big
Describe the process after glycolysis in yeast/plants (2 stages) - CORRECT-
ANSWERS1. Pyruvate loses CO2 to form ethanal
2. Ethanal reduced to ethanol and reduced NAD oxidised to NAD
What is the purpose of anaerobic respiration ? - CORRECT-ANSWERSTo
produce ATP by glycolysis
Oxidises reduced NAD from glycolysis to NAD to allow glycolysis to continue
Describe the process of glycolysis in animal cells / some bacteria - CORRECT-
ANSWERSPyruvate reduced to lactate (lactic acid)
Reduced NAD oxidised to form NAD
, Where does the link reaction occur ? - CORRECT-ANSWERSMatrix of the
mitochondria
What is the purpose of the link reaction ? - CORRECT-ANSWERSTo convert
pyruvate to acetyl coenzyme A
Describe what happens during the link reaction - CORRECT-ANSWERS1.
Pyruvate is decarboxylated to form acetate
2a. Pyruvate is oxidised to acetate
2b. NAD is reduced to reduced NAD
3. Coenzyme A combines with acetate to form acetyl coenzyme A
Where is the acetyl coenzyme A used ? - CORRECT-ANSWERSKrebs Cycle
Where is the reduced NAD used ? - CORRECT-ANSWERSOxidative
phosphorylation
What happens to the CO2 produced in the link reaction ? - CORRECT-
ANSWERSLost as a waste product
What happens in the Krebs Cycle ? - CORRECT-ANSWERSATP and reduced
coenzymes are produced in a series of redox reactions
CO2 is lost as a waste product
Where does the Krebs Cycle take place ? - CORRECT-ANSWERSMatrix of the
mitochondria
Describe what happens in the Krebs Cycle - CORRECT-ANSWERS1. Aceyl CoA
reacts with a 4 carbon compound to form a 6 carbon compound and
coenzyme A
2. The 6 carbon compound forms a 5 carbon compound
3. The 5 carbon compound reforms the 4 carbon compound
What is substrate level phosphorylation ? - CORRECT-ANSWERSWhen a
phosphate group is directly transferred from one molecule to another
e.g. the production of ATP in the Krebs Cycle
What is the CoA produced in the Krebs Cycle used for ? - CORRECT-
ANSWERSThe Link Reaction
What are the reduced enzymes produced in the Krebs Cycle used for ? -
CORRECT-ANSWERSOxidative phosphorylation
What is oxidative phosphorylation ? - CORRECT-ANSWERSThe process where
energy from electrons from reduced coenzymes is used to synthesise ATP
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