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Which formula shows glucose? Tick (✓) one box - AQA - GCSE Biology - Question 4 - 2021 - Paper 1

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Which formula shows glucose? Tick (✓) one box. C₆H₁₂O₆ CO₂ H₂O O₂ Which type of enzyme breaks down starch? Tick (✓) one box. Carbohydrase Lipase Protea... show full transcript

Worked Solution & Example Answer:Which formula shows glucose? Tick (✓) one box - AQA - GCSE Biology - Question 4 - 2021 - Paper 1

Step 1

Which formula shows glucose?

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Answer

The correct formula that shows glucose is C₆H₁₂O₆.

Step 2

Which type of enzyme breaks down starch?

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Answer

The enzyme that breaks down starch is Carbohydrase.

Step 3

Why were the starch solution and the amylase-starch solution left for five minutes before mixing them together?

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Answer

The starch solution and the amylase-starch solution were left for five minutes so that both solutions could reach 10 °C.

Step 4

How many minutes did it take until the iodine solution and amylase-starch solution mixture was yellow-brown?

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Answer

It took approximately 10 minutes until the iodine solution and amylase-starch solution mixture was yellow-brown.

Step 5

How could a more accurate time be obtained?

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Answer

A more accurate time could be obtained by testing the mixture with iodine solution every 30 seconds.

Step 6

Which temperature did the enzyme work quickest at?

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Answer

The enzyme worked quickest at 35 °C.

Step 7

Explain why the iodine solution remained blue-black in the investigation at 80 °C.

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Answer

The iodine solution remained blue-black at 80 °C because the enzyme/amylase was denatured, meaning that it lost its active site shape and could not function. As a result, starch was not broken down, or starch was still present in the solution.

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