ffffffffffffffffffffffffffffffffffffff
Oxford Cambridge and RSA
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
zzzzzzzz
Lklklklklklkkkld djfdjfhjf ebfjefejf ejfbejfjeeeeeeeeeeeeeeeeeeeeeejjjjjjjjjjjjjjjjjjjjjjjjeeeeeeejkkkkkkkkkkkk
Thursday 22 May 2025 – Morning
AS Level Biology A
ccccccccccccccccccccccccccccccccccccc
H020/02 Depth in biology
Time allowed: 1 hour 30 minutes
AS-Level OCR 2025 Biology A Paper 2
hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
hhhhhhhhhhh
OCR is an exempt Charity
Turn over
, 2
1
(a) The table describes features of molecules.
Complete the table. Use ticks (✓) to identify if the feature describes starch or cellulose.
Description Starch Cellulose
Is made of amylose and amylopectin
Is a long unbranched chain
Is made from β glucose molecules
[3]
(b) Students complete paper chromatography on carbohydrates.
The table shows the Rf values for known carbohydrates.
© researchgate.net, ResearchGate. Item removed due to third party copyright restrictions. Link to material - www.researchgate.net/publication/261143652_Extractio
The measurements recorded for an unknown carbohydrate were:
Distance travelled by solvent = 8.50 cm
Distance travelled by carbohydrate = 4.34 cm
Calculate the Rf value of the unknown carbohydrate and use the table to identify it.
Give your answer to 2 decimal places.
Rf value = ...............................................................
Name of carbohydrate = ...............................................................
[2]
© OCR 2025
, 3
(c) Outline the role of the solvent in paper chromatography.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [2]
© OCR 2025 Turn over
Oxford Cambridge and RSA
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
zzzzzzzz
Lklklklklklkkkld djfdjfhjf ebfjefejf ejfbejfjeeeeeeeeeeeeeeeeeeeeeejjjjjjjjjjjjjjjjjjjjjjjjeeeeeeejkkkkkkkkkkkk
Thursday 22 May 2025 – Morning
AS Level Biology A
ccccccccccccccccccccccccccccccccccccc
H020/02 Depth in biology
Time allowed: 1 hour 30 minutes
AS-Level OCR 2025 Biology A Paper 2
hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
hhhhhhhhhhh
OCR is an exempt Charity
Turn over
, 2
1
(a) The table describes features of molecules.
Complete the table. Use ticks (✓) to identify if the feature describes starch or cellulose.
Description Starch Cellulose
Is made of amylose and amylopectin
Is a long unbranched chain
Is made from β glucose molecules
[3]
(b) Students complete paper chromatography on carbohydrates.
The table shows the Rf values for known carbohydrates.
© researchgate.net, ResearchGate. Item removed due to third party copyright restrictions. Link to material - www.researchgate.net/publication/261143652_Extractio
The measurements recorded for an unknown carbohydrate were:
Distance travelled by solvent = 8.50 cm
Distance travelled by carbohydrate = 4.34 cm
Calculate the Rf value of the unknown carbohydrate and use the table to identify it.
Give your answer to 2 decimal places.
Rf value = ...............................................................
Name of carbohydrate = ...............................................................
[2]
© OCR 2025
, 3
(c) Outline the role of the solvent in paper chromatography.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
...................................................................................................................................................................... [2]
© OCR 2025 Turn over
