Theme B: Form and function

18 original questions · 18 derived marking activities. Teaching explanations are AI-authored; independent teacher review is pending.

18 of 36 activities match

• Question 1A cubic cell has sides of length 2.0 cm. Calculate its surface-area-to-volume ratio. Compare it with a cubic cell of side 1.0 cm and explain one consequence for exchange with the environment.AI checkedStandard5 marksNo calculator+
• Question 3Extension practice (includes HL content beyond the prescribed SL syllabus): Explain what happens to a plant cell placed in a hypotonic solution. Refer to water potential, osmosis and the cell wall.AI checkedEnrichmentStandard4 marksNo calculator+
• Question 5Extension practice (includes HL content beyond the prescribed SL syllabus): Outline the roles of the rough endoplasmic reticulum and the Golgi apparatus in the production and secretion of a protein.AI checkedEnrichmentStandard4 marksNo calculator+
• Question 7Explain how the fluid mosaic model describes the structure of the plasma membrane.AI checkedStandard3 marksNo calculator+
• Question 9Explain why a decreasing surface-area-to-volume ratio can limit the size of a cell that increases in size without changing its shape or exchange adaptations.AI checkedStandard3 marksNo calculator+
• Question 11Outline primary active transport across a plasma membrane, and explain how ATP hydrolysis drives movement against a gradient.AI checkedStandard3 marksNo calculator+
• Question 13Distinguish between a monosaccharide, a disaccharide and a polysaccharide, giving one example of each.AI checkedFoundation3 marksNo calculator+
• Question 15Extension practice (HL content beyond the prescribed SL syllabus): Outline the level of protein structure at which hydrogen bonding creates an alpha helix or beta pleated sheet.AI checkedEnrichmentFoundation2 marksNo calculator+
• Question 17Explain how the alveoli of the human lung are structurally adapted for efficient gas exchange. Refer to surface area, diffusion distance and blood supply.AI checkedStandard4 marksNo calculator+
• Question 19Extension practice (includes HL content beyond the prescribed SL syllabus): Outline the roles of villi and microvilli in increasing the efficiency of absorption in the small intestine.AI checkedEnrichmentStandard3 marksNo calculator+
• Question 21Explain gas exchange between alveolar air and blood in the lungs, referring to diffusion driven by partial-pressure differences.AI checkedStandard4 marksNo calculator+
• Question 23Extension practice (includes HL content beyond the prescribed SL syllabus): Outline the roles of the SA node and AV node in coordinating the cardiac cycle.AI checkedEnrichmentStandard3 marksNo calculator+
• Question 25Extension practice (HL content beyond the prescribed SL syllabus): Explain how the structure of the nephron enables both filtration and selective reabsorption during urine formation.AI checkedEnrichmentStandard3 marksNo calculator+
• Question 27Extension practice (includes HL content beyond the prescribed SL syllabus): Explain the role of haemoglobin in the transport of oxygen in the blood, referring to its structure.AI checkedEnrichmentStandard3 marksNo calculator+
• Question 29Extension practice (HL content beyond the prescribed SL syllabus): Explain how antagonistic pairs of muscles, such as the biceps and triceps, bring about movement at a joint.AI checkedEnrichmentFoundation3 marksNo calculator+
• Question 31Explain, in terms of hydrogen bonding, why water has a high specific heat capacity, and explain one biological advantage this property provides to aquatic organisms.AI checkedStandard3 marksNo calculator+
• Question 33Explain how the structure of alveoli in the lungs is adapted to maximize the rate of gas exchange.AI checkedStandard3 marksNo calculator+
• Question 35Explain why increasing the temperature beyond an enzyme's optimum causes a sharp decrease in reaction rate, with reference to enzyme structure.AI checkedStandard3 marksNo calculator+