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3.1 Biological molecules
Quick questions on Carbohydrates: monosaccharides, disaccharides and polysaccharides - AQA A-Level Biology
6short 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 reducing sugars (Benedict's test)?Show answer
All monosaccharides and some disaccharides (maltose, lactose) are reducing sugars.
What is non-reducing sugars (e.g. sucrose)?Show answer
Sucrose is not a reducing sugar, so Benedict's stays blue. To detect it:
What is starch (iodine test)?Show answer
Add iodine in potassium iodide solution (orange-brown). If starch is present, the colour changes to blue-black.
What is q1?Show answer
Name the bond formed when two monosaccharides join, and the type of reaction involved. [2 marks]
What is q2?Show answer
Explain why cellulose is suited to its role in plant cell walls but starch is not. [4 marks]
What is q3?Show answer
A food sample turns Benedict's solution brick-red and turns blue-black with iodine. What can you conclude about the carbohydrates present? [2 marks]
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