Ijmb Model Questions Vol1 2020 Biology Question 3

Practice essay / theory question 3 from the 2020 Ijmb Model Questions Vol1 Biology examination. This question covers Nutrition, Digestive system, Enzymes, Macronutrient metabolism .

Ijmb Model Questions Vol1 2020 Biology Essay / Theory
Topics: Nutrition Digestive system Enzymes Macronutrient metabolism
Question 3 IJMB_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

The labelled diagram shows the major organs of the human digestive system involved in the processing of food.

Question Parts

( a )
Describe, in the correct sequential order, the pathway that a carbohydrate‑rich food follows from ingestion to absorption. For each organ, name the principal enzyme(s) that act on the carbohydrate and the specific chemical change that occurs.
( b )
A meal contains 120 g of carbohydrate, 45 g of protein and 30 g of fat. Calculate the total caloric value of the meal using the Atwater factors (carbohydrate = 4 kcal g⁻¹, protein = 4 kcal g⁻¹, fat = 9 kcal g⁻¹). Then, briefly explain how each macronutrient is processed by the digestive system before absorption.
( c )
If the absorptive surface area of the small intestine were reduced by 30 % (e.g., due to villous atrophy), identify two nutrient deficiencies that are most likely to develop and explain the physiological consequences of each deficiency.

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About This Question

This is Ijmb Model Questions Vol1 2020 Biology Question 3. It is one of the essay questions from the 2020 Ijmb Model Questions Vol1 Biology examination.

The question covers Nutrition, Digestive system, Enzymes, Macronutrient metabolism .

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