Home / Mock Exam IB DP Biology HL Paper 2 Set 1

IB DP Biology Mock Exam HL Paper 2 Set 1 - 2025 Syllabus

IB DP Biology Mock Exam HL Paper 2 Set 1

Prepare for the IB DP Biology Exam with our comprehensive IB DP Biology Exam Mock Exam HL Paper 2 Set 1. 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

IB DP Biology Mock Tests -All Sets

Question 

The diagram illustrates the molecular structure of sucrose, a disaccharide that is broken down during digestion so the body can absorb the monosaccharides glucose and fructose.
(a) Name the reaction that splits a disaccharide into its monosaccharide components.
(b) Explain how the structure of capillaries enables efficient absorption of monosaccharides.
(c) Briefly describe how fructose can cross a cell membrane by facilitated diffusion.
▶️ Answer/Explanation
Detailed solution

(a)
The reaction is hydrolysis, a catabolic process that breaks chemical bonds using water.

(b)
Capillaries support nutrient exchange because:
• Their walls are only one cell thick, providing a very short diffusion distance.
• They create large surface areas through extensive branching networks.
• Many capillaries contain fenestrations (small openings) that allow molecules to move across more quickly.

(c)
Facilitated diffusion is passive and moves molecules down their concentration gradient. Fructose crosses the membrane using specific carrier or channel proteins that bind to it and help it pass through the phospholipid bilayer without requiring ATP.

More Mock Exams IB DP Bio HL Paper 2 Questions..
Scroll to Top