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AQA AS BIOLOGY PAPER 2 TUESDAY 6 OCTOBER 2024 $7.99
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AQA AS BIOLOGY PAPER 2 TUESDAY 6 OCTOBER 2024
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AQA AS BIOLOGY PAPER 2 TUESDAY 6 OCTOBER 2024AQA AS BIOLOGY PAPER 2 TUESDAY 6 OCTOBER 2024

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  • October 12, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • aqa as biology paper 2

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  • AQA AS BIOLOGY PAPER 2
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AQA AS Biology Paper 2 | Tuesday 6 June 2017
Study online at https://quizlet.com/_67fl0o


AQA AS BIOLOGY PAPER 2 TUESDAY 6 JUNE 2024
1. Glycogen and cellulose are both carbohydrates.
Describe two differences between the structure of a cellulose molecule and a
glycogen molecule.: 1. Cellulose is made up of ²-glucose (monomers) and glycogen is
made up of ±-glucose (monomers)

2. Cellulose molecule has straight chain and glycogen is branched

3. Cellulose molecule has straight chain and glycogen is coiled

4. glycogen has 1,4- and 1,6- glycosidic bonds and cellulose has only 1,4- glycosidic
bonds
2. Starch is a carbohydrate often stored in plant cells.

Describe and explain two features of starch that make it a good storage
molecule.: 1. Insoluble (in water), so doesn't affect water potential

2. Branched / coiled / (±-)helix, so makes molecule compact
Or
Branched / coiled / (±-)helix so can fit many (molecules) in small area

3. Polymer of (±-)glucose so provides glucose for respiration

4. Branched / more ends for fast breakdown / enzyme action

5. Large (molecule), so can't cross the cell membrane
3. The cells of beetroot contain a red pigment. A student investigated the effect of
temperature on the loss of red pigment from beetroot. He put discs cut from
beetroot into tubes containing water. He maintained each tube at a different
temperature. After 25 minutes, he measured the percentage of light passing through
the water in each tube

(i)
The student put the same volume of water in each tube.
Explain why it was important that he controlled this experimental variable.

(ii)




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