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Exam Elaboration | Biology
MARK SCHEME – A-LEVEL BIOLOGY PAPER 2 – 74022 – SPECIMEN
SKU: AQA A LEVEL BIOLOGY | Pages: 15 | Year: 2023
Document Brief Description
MARK SCHEME A LEVEL BIOLOGY PAPER 2 74022 SPECIMEN
Equilibrium reached;
2. Allow for expansion/pressure change in
apparatus;
3. Allow respirati...
MARK SCHEME A LEVEL BIOLOGY PAPER 2 74022 SPECIMEN
Equilibrium reached;
2. Allow for expansion/pressure change in
apparatus;
3. Allow respiration rate of seeds to stabilise;
3 1. Accept equilibrate
3. Ignore seeds
acclimatise
01.2 1. Optimum temperature/temperature for normal
growth of seeds;
2. (Optimum temperature) for enzymes involved in
respiration;
2
01.3 1. Oxygen taken up/used by seeds;
2. CO2 given out is absorbed by KOH (solution);
3. Volume/pressure (in B) decreases
. Calcium ions diffuse into myofibrils from
(sarcoplasmic) reticulum;
2. (Calcium ions) cause movement of tropomyosin
(on actin);
3. (This movement causes) exposure of the
binding sites on the actin;
4. Myosin heads attach to binding sites on actin;
5. Hydrolysis of ATP (on myosin heads) causes
myosin heads to bend;
6. (Bending) pulling actin molecules;
7. Attachment of a new ATP molecule to each
myosin head causes myosin heads to detach
(from actin sites);
5 max
02.2 1. Releases relatively small amount of energy /
little energy lost as heat;
2. Releases energy instantaneously;
3. Phosphorylates other compounds, making them
more reactive;
4. Can be rapidly re-synthesised;
5. Is not lost from/does not leave cells;
- 15-pages detailed model answer (PDF + online view)
- Clinical reasoning & medication selection justified
- NP-level explanation with key teaching points
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MARK SCHEME – A-LEVEL BIOLOGY PAPER 2 – 74022 – SPECIMEN
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