The table shows some of the enzymes involved in the digestion of starch, protein and fat, in three parts of the digestive system - Edexcel - GCSE Biology - Question 4 - 2012 - Paper 1
Question 4
The table shows some of the enzymes involved in the digestion of starch, protein and fat, in three parts of the digestive system.
Complete the sentences by putting ... show full transcript
Worked Solution & Example Answer:The table shows some of the enzymes involved in the digestion of starch, protein and fat, in three parts of the digestive system - Edexcel - GCSE Biology - Question 4 - 2012 - Paper 1
Step 1
Complete the sentences by putting a cross (X) in the box next to your answer. (i) Enzyme Q is produced by the
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Answer
Enzyme Q is produced by the pancreas.
Step 2
Complete the sentences by putting a cross (X) in the box next to your answer. (ii) Molecules Y and Z are
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Answer
Molecules Y and Z are fatty acids and glycerol.
Step 3
Name enzyme R.
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Answer
Enzyme R is protease (or pepsin).
Step 4
Name molecule W.
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Answer
Molecule W is amino acid (or amino acids).
Step 5
Calculate the difference in the rate of the reaction between pH 1 and pH 2.
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Answer
The difference in the rate of the reaction between pH 1 and pH 2 is 3 arbitrary units.
Step 6
Suggest why this enzyme works better at pH 1 than at pH 2.
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At pH 1, the active site is not distorted, leading to better enzyme substrate complexes. At pH 2, the enzyme's shape may change, leading to less efficient reactions.
Step 7
Explain the roles of bile in digestion.
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Bile emulsifies fats to increase the surface area for lipase action and neutralizes stomach acid, providing an optimal pH for enzymes in the small intestine.
