AQA
A-Level
BIOLOGY
3.2a Cells
2.1-2.3 | Cell Structure
Time allowed
62 minutes
MARK SCHEME
Score Percentage
/52 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, .(a) 1. Starch formed from α-glucose but cellulose formed from β-glucose;
2. Position of hydrogen and hydroxyl groups on carbon atom 1 inverted.
2
(b) 1. Insoluble;
2. Don’t affect water potential;
OR
3. Helical;
Accept form spirals
4. Compact;
OR
5. Large molecule;
6. Cannot leave cell.
2
(c) 1. Long and straight chains;
2. Become linked together by many hydrogen bonds to form fibrils;
3. Provide strength (to cell wall).
3
[7]
A-Level
BIOLOGY
3.2a Cells
2.1-2.3 | Cell Structure
Time allowed
62 minutes
MARK SCHEME
Score Percentage
/52 %
4.1 | CELL BIOLOGY | QUESTION PAPER 1 1
, .(a) 1. Starch formed from α-glucose but cellulose formed from β-glucose;
2. Position of hydrogen and hydroxyl groups on carbon atom 1 inverted.
2
(b) 1. Insoluble;
2. Don’t affect water potential;
OR
3. Helical;
Accept form spirals
4. Compact;
OR
5. Large molecule;
6. Cannot leave cell.
2
(c) 1. Long and straight chains;
2. Become linked together by many hydrogen bonds to form fibrils;
3. Provide strength (to cell wall).
3
[7]
