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3.3 Organisms exchange substances with their environment
Quick questions on Digestion, enzymes and absorption in the ileum - AQA A-Level Biology 3.3
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is monoglycerides and fatty acids - diffusion?Show answer
Being lipid-soluble (non-polar), they diffuse directly across the phospholipid bilayer of the epithelial cell membrane after release from micelles. Inside, they are reformed into triglycerides, packaged into chylomicrons, and enter the lacteal (lymph), not the blood capillary.
What is q1?Show answer
Explain the advantage of starch being digested by amylase and then a membrane-bound disaccharidase, rather than a single enzyme in the lumen. [2 marks]
What is q2?Show answer
Describe the role of bile salts in the digestion and absorption of lipids. [3 marks]
What is q3?Show answer
A drug blocks the sodium-potassium pump in ileum epithelial cells. Explain its effect on glucose absorption. [3 marks]
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