Pearson Edexcel International GCSE in Biology · 4BI1 · Free · no account needed
Digestive Enzymes and Bile — exam questions
10 original Incandio exam-style questions on Digestive Enzymes and Bile, 27 marks, about 27 minutes of writing. Each one carries the command word, the tariff and the specification statement it assesses, exactly as a paper presents them. This is an original Incandio practice question, written to reflect the structure and demands of the qualification. It is not an official Pearson Edexcel past-paper question.
This is the practice set for Digestive Enzymes and Bile — the lesson that teaches it. Read the lesson first if the idea is new; come here when you want to find out whether you can turn it into marks. Completely free, no account needed to read.
What these questions ask of you
6 command words run through this set, and on Pearson Edexcel International GCSE Biology each one means something precise. Answering the wrong command is the commonest way a candidate who understands the lesson still loses the mark.
- Which (1 mark)
- one option chosen from the set given
- Name (1–2 marks)
- the correct term, spelled recognisably
- Give (1–2 marks)
- a short factual answer drawn from recall or from the data
- Complete (1–5 marks)
- the missing entries in a table, diagram or sentence
- Explain (2–4 marks)
- a causal chain — WHY it happens, each link a separate marking point Misread as: describing what happens without giving the reason it happens
- Discuss (3–6 marks)
- an account that puts more than one consideration side by side and reaches a position
Assessed on Paper 1 (4BI1/1B) and Paper 2 (4BI1/2B), against AO1, AO2, AO3.
Where these sit in the specification
Pearson Edexcel International GCSE Biology (4BI1) — statements 2.29 · 2.30 · 2.31. Incandio is aligned to this specification; it is not published by, endorsed by or affiliated with Pearson, and it reproduces none of Pearson's wording.
The 10 questions
Answer them on paper, then open the lesson's exam practice to have them marked. The mark scheme, the accepted and rejected answers and the annotated model answer are in Incandio and are not printed here — an answer beside its question is not practice.
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Table 1 — the time taken for the pH of a milk and lipase mixture to fall from 9 to 7, at 35 °C. Falling pH shows fatty acids being released. Tube Contents Time for pH to fall to 7 / s 1 milk + lipase + bile salts 42 2 milk + lipase, no bile salts 168 3 milk + bile salts, no lipase no change after 600 (a)
(2)Give
Give the number of times faster the reaction in tube 1 was than the reaction in tube 2.
Table 1 — the time taken for the pH of a milk and lipase mixture to fall from 9 to 7, at 35 °C. Falling pH shows fatty acids being released. Tube Contents Time for pH to fall to 7 / s 1 milk + lipase + bile salts 42 2 milk + lipase, no bile salts 168 3 milk + bile salts, no lipase no change after 600 (b)
(3)Explain
Explain the difference between the results for tube 1 and tube 2.
Table 1 — the time taken for the pH of a milk and lipase mixture to fall from 9 to 7, at 35 °C. Falling pH shows fatty acids being released. Tube Contents Time for pH to fall to 7 / s 1 milk + lipase + bile salts 42 2 milk + lipase, no bile salts 168 3 milk + bile salts, no lipase no change after 600 (c)
(1)Give
Give the reason tube 3 was included in this investigation.
Table 1 — the time taken for the pH of a milk and lipase mixture to fall from 9 to 7, at 35 °C. Falling pH shows fatty acids being released. Tube Contents Time for pH to fall to 7 / s 1 milk + lipase + bile salts 42 2 milk + lipase, no bile salts 168 3 milk + bile salts, no lipase no change after 600 (Total for Question 1 = 6 marks)
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(1)Which
Which enzyme breaks maltose down into glucose?
Enzyme A amylase B maltase C protease D lipase (Total for Question 2 = 1 mark)
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(2)Name
Name the two products of the complete digestion of a lipid.
(Total for Question 3 = 2 marks)
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(2)Give
Give the organ where bile is produced and the organ where it is stored.
(Total for Question 4 = 2 marks)
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(3)Complete
Complete Table 2 by giving the missing substrate and the missing products.
Table 2 — three digestive enzymes. Enzyme Substrate Products amylase starch maltose protease amino acids lipase lipid (Total for Question 5 = 3 marks)
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(4)Explain
Explain how bile increases the rate at which lipids are digested.
(Total for Question 6 = 4 marks)
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(3)Explain
Explain why bile is needed to change the pH of the contents entering the small intestine.
(Total for Question 7 = 3 marks)
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(6)Discuss
Discuss why bile is essential to fat digestion even though it contains no enzymes at all.
(Total for Question 8 = 6 marks)
Have them marked, then defend the answer
Practice tells you the mark; teaching it back tells you whether you understand it. On Incandio a topic counts as mastered only once you have taught it and defended it.
- Mark these questions — 10 questions, marked on Incandio against the authored scheme, with the mistake you actually made named.
- Teach it — explain Digestive Enzymes and Bile to Ember, an AI pupil who does not have it yet and asks the awkward question.
- Defend it — argue it against William Beaumont over three rounds, marked against descriptors you can read first.
Completely free. No subscriptions, no paywalls, no account needed to start.
Back to the lesson
- Digestive Enzymes and Bile — The demolition tools that cut food molecules small enough to absorb — and the one secretion that does the job without being an enzyme at all.
- All of Incandio Biology · Incandio Exam Practice