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  • 2025 OCR AS LEVEL BIOLOGY A H020/02 Depth In Biolo
  • 2025 OCR AS LEVEL BIOLOGY A H020/02 Depth in Biolo
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2025 OCR AS LEVEL BIOLOGY A H020/02 Depth in Biology Question Paper & Mark Scheme (Merged) May 2025 [VERIFIED]

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2025 OCR AS LEVEL BIOLOGY A H020/02 Depth in Biology Question Paper & Mark Scheme (Merged) May 2025 [VERIFIED] 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 Is made of amylose and amylopectin Cellulose Is a long unbranched chain Is made from β glucose molecules (b) Students complete paper chromatography on carbohydrates. The table shows the Rf values for known carbohydrates. © , ResearchGate. Item removed due to third party copyright restrictions. Link to material - The measurements recorded for an unknown carbohydrate were: Distance travelled by solvent = 8.50 cm Distance travelled by carbohydrate = 4.34 cm

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2025 OCR AS LEVEL BIOLOGY A H020/02 Depth in Biology Question Paper & Mark Scheme (Merged)
May 2025 [VERIFIED]

, 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.




© OCR 2025

, 3

Rf value = ...............................................................

Name of carbohydrate = ...............................................................
[2]




© OCR 2025 Turn over

, 2
(c) Outline the role of the solvent in paper chromatography.

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

..........................................................................................................................................................

. ....................................................................................................................................................... [2]




© OCR 2025

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