AS Biology 2.1.2 Biological Molecules

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1. 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
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2. What is a carbohydrate?

  • A compound made up of more than one carbon atom
  • A group of molecules containing carbon, hydrogen and oxygen
  • A compound containing glycosidic bonds between carbon atoms

3. In solution, hexose, pentose and triose sugars exist in what form?

  • Straight chains
  • Ring/cyclic
  • In a helix structure

4. 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

5. When two monosaccharides join to make a disaccharide, which type of reaction occurs?

  • A condensation reaction
  • A hydrolysis reaction

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