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