The diagram shows the digestive system of a human - Edexcel - GCSE Biology - Question 1 - 2016 - Paper 1
Question 1
The diagram shows the digestive system of a human.
(a) (i) Use words from the box to complete the sentences.
(a) (ii)
(b) (i) A description linking two of the fo... show full transcript
Worked Solution & Example Answer:The diagram shows the digestive system of a human - Edexcel - GCSE Biology - Question 1 - 2016 - Paper 1
Step 1
(a) (i) Use words from the box to complete the sentences.
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Answer
The enzyme responsible for breaking down starches into simple sugars is amylase.
Step 2
(a) (ii)
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Answer
The part labeled X in the diagram corresponds to the small intestine.
Step 3
(b) (i) A description linking two of the following:
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Answer
The enzyme activity typically increases as the temperature approaches the optimal range of 36°C to 38°C, and at 50°C, the activity decreases due to denaturation.
Step 4
(b) (ii) An explanation linking two of the following:
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Answer
At temperatures above the optimum (above 38°C), the enzyme's active site may change shape, leading to denaturation. Consequently, the enzyme may no longer form a complex with the substrate.
Step 5
(c) Any drawing that shows that the enzyme has a complementary shape to any part of the substrate.
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Answer
A drawing should illustrate an enzyme with a well-defined active site that matches the shape of the substrate, clearly indicating how the two interact.
