BIOL1- AQA A-Level Biology Unit 1

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1. What must a solution be in order to be fractionated?

  • Isotonic, cold and containing sodium ions
  • Isotonic, hot and buffered
  • Isotonic, cold and buffered
  • Hypertonic, cold and buffered
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2. Where do competitive inhibitors bind to?

  • Point other than active site
  • Enzyme-substrate complex
  • The active site
  • The substrate

3. What's an example of a pathogen that has antigenic variability?

  • Measles
  • Influenza
  • Chickenpox

4. How is the oesophagus adapted for transport?

  • It has a large surface area
  • Thick muscular wall
  • Produces mucus
  • Near to blood capillaries

5. What is the correct description of co-transport?

  • Sodium ions actively transported out of epithelial cells by Sodium-Potassium pump into blood, Sodium ions diffuse into epithelial cells against concentration gradient, Na+ ions flood back in and couple with glucose, Glucose passes into blood plasma
  • Sodium ions actively transported out of epithelial cells by Sodium-Potassium pump into blood, Sodium ions diffuse into epithelial cells down concentration gradient, Sodium ions flood back in and couple with glucose, Glucose passes into blood plasma
  • Sodium ions diffuse out of epithelial cells by Sodium-Potassium pump into blood, Sodium ions diffuse into epithelial cells down concentration gradient, Sodium ions flood back in and couple with glucose, Glucose passes into blood plasma
  • Glucose ions actively transported out of epithelial cells by Sodium-Potassium pump into blood, Glucose ions diffuse into epithelial cells down concentration gradient, Glucose ions flood back in and couple with Sodium, Sodium passes into blood plasma

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