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Judgments

Skeletal Muscles MS.pdf

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Skeletal Muscles MS.pdf

Institution
Biology
Course
Biology

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AQA
A-Level
BIOLOGY
Organisms Respond to Changes in Environments
Skeletal Muscles

Time allowed
62 minutes

MARK SCHEME




Score Percentage

/52 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1

, (a) (i) Decreases;
Accept any word that means a decrease e.g. shorter /
narrower / smaller etc
1


(ii) Nothing / stays the same length / does not change;
1




(b) 1. Two marks for correct answer of 29545-30455;
Correct answer = 2 marks outright. Range allows for a 1mm
error in measuring

2. One mark for incorrect answers in which candidate clearly divides
measured width by actual width;
Ignore rounding up
2




(c) (Idea ATP is needed for:)

1. Attachment / cross bridges between actin and myosin;
Accept the role of ADP in attachment

2. ‘Power stroke’ / movement of myosin heads / pulling of actin;
Not just ‘filaments slide’ as given in the question stem

3. Detachment of myosin heads;

4. Myosin heads move back / to original position / ‘recovery stroke’
3 max
[7]
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Type
Judgments

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