AS Biology 2.1.2 Biological Molecules

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1. Which two of these disaccharides are examples of reducing sugars?

  • maltose, lactose
  • maltose, sucrose
  • sucrose, sucrase
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2. Which of these is NOT a characteristic of monosaccharides?

  • Solubility in non-polar substances
  • Insolubility in non-polar substances
  • They taste sweet
  • Water-solubility

3. Which reaction occurs when a disaccharide is broken into two monosaccharides?

  • A hydrolysis reaction
  • A condensation reaction

4. How does the structure of cellulose (in straight chains) aid its function?

  • Many polymers in a chain held by hydrogen bonds adds a lot of strength to cell walls supporting turgid cells
  • The straight chains give plant cells more surface area to take up water and minerals

5. How does the structure of starch (spiral, compact) aid its function?

  • It is insoluble, has no osmotic effect and you can store more of it
  • It lines up to add strength to the molecule

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