Ijmb Model Questions Vol1 2019 Biology Question 3

Practice essay / theory question 3 from the 2019 Ijmb Model Questions Vol1 Biology examination. This question covers Nutrition, Digestive system, Absorption of nutrients .

Ijmb Model Questions Vol1 2019 Biology Essay / Theory
Topics: Nutrition Digestive system Absorption of nutrients
Question 3 IJMB_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • essay

The labelled diagram shows the human small intestine with three distinct regions marked A, B and C. Region A corresponds to the duodenum, region B to the jejunum and region C to the ileum. The diagram indicates the primary sites where carbohydrates, proteins and lipids are absorbed respectively.

Question Parts

( a )
State the label (A, B or C) that represents the main site of absorption for each of the following nutrients: carbohydrate, protein and lipid.
( b )
Briefly describe the main enzymatic processes that occur in each of the three regions to enable the absorption of the respective nutrient.
( c )
A meal contains 60 g of carbohydrate, 30 g of protein and 20 g of fat. Assuming complete digestion and absorption, calculate the total energy (in kilocalories) supplied by the absorbed nutrients. Use the Atwater factors: carbohydrate = 4 kcal g⁻¹, protein = 4 kcal g⁻¹, fat = 9 kcal g⁻¹. Show all steps of your calculation.

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About This Question

This is Ijmb Model Questions Vol1 2019 Biology Question 3. It is one of the essay questions from the 2019 Ijmb Model Questions Vol1 Biology examination.

The question covers Nutrition, Digestive system, Absorption of nutrients .

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