IB DP Biology Mock Exam HL Paper 2 Set 4 - 2025 Syllabus
IB DP Biology Mock Exam HL Paper 2 Set 4
Prepare for the IB DP Biology Exam with our comprehensive IB DP Biology Exam Mock Exam HL Paper 2 Set 4. Test your knowledge and understanding of key concepts with challenging questions covering all essential topics. Identify areas for improvement and boost your confidence for the real exam
Question
Celiac disease is an immune reaction to eating gluten, a protein found in many cereals. The diagram shows the arrangement of normal villi and villi affected by celiac disease in the small intestine.
(a) Outline the functions of the villi in the small intestine.
(b) Explain the consequences of celiac disease for absorption of digested nutrients.
(c) Wheat, barley and rye all contain gluten. Outline how a protein such as gluten is digested.
Answer/Explanation
Ans:
a)
a. increase the surface area for absorption
b. absorption of digested foods/nutrients
c. absorption of mineral ions/vitamins
b)
a. (celiac disease/gluten causes) much smaller villi/flattened villi/smaller surface area (of villi) / no villi
b. (smaller villi leads to) less efficient/less/slower/poor absorption OR nutrients/energy lost / fatigue/malnutrition may result
c. (celiac sufferers) must eat a gluten-free diet / WTTE Note that this question requires an explain not an outline
c)
a. enzymes/protease required
b. (protease/peptidase) breaks peptide bonds/bonds between amino acids
c. hydrolysis adds water molecules/breaks peptide bonds between amino acids