BY4 7

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Author:
JustinL
ID:
267741
Filename:
BY4 7
Updated:
2014-03-24 17:20:08
Tags:
Biology
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Description:
Wjec BY4
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  1. Four examples of activities where ATP is converted into ADP
    • Active transport
    • Muscle contraction
    • Protein synthesis
    • Nerve impulse transmission 
  2. Describe Chemiosmosis.
    • High energy electrons fuel proton pumps.
    • Pumps protons into the intermembrane space, which creates an electrochemical gradient
    • Causes protons to flow back via stalked particles of ATP synthetase.
    • Which synthesises ATP.
  3. Describe Ultrafiltration
    • High hydrostatic pressure in the glomerulus. 
    • Forces small molecules through the Basement membrane which acts as a molecular sieve.
  4. How does glucose move into the bloodstream when being selectively reabsorbed at the PCT?
    Facilitated diffusion
  5. How do amino acids move into the bloodstream when being selectively reabsorbed at the PCT?
    Facilitated diffusion
  6. How does water move into the bloodstream when being selectively reabsorbed at the PCT?
    Osmosis
  7. How do sodium ions move into the bloodstream when being selectively reabsorbed at the PCT?
    Active transport
  8. Describe Cyclic phosphorylation.
    • Light absorbed by Photosystem 1.
    • High energy electrons used to fuel proton pump.
    • Which creates an electrochemical gradient for ATP synthetase. 
    • Electrons return to Photosystem 1.
  9. Give an advantage of chemical control:
    Quick and effective means of control.
  10. Give an advantage of chemical control:
    Chemicals can be applied on a small area.
  11. Give an advantage of chemical control:
    Application does not require a large amount of skill.
  12. Give a disadvantage of chemical control:
    Chemicals are not specific and could eradicate useful species.
  13. Give a disadvantage of chemical control:
    Resistance to the pesticide may occur.
  14. Give a disadvantage of chemical control:
    Can cause the death of fish, birds and mammals from bioaccumulation.

  15. Give a disadvantage of chemical control:
    There is a risk to human health due to contamination of rivers.
  16. Give an advantage of Biological control.
    Can be highly specific to one pest.
  17. Give an advantage of Biological control.
    Long term control can be achieved by predator-prey relationship forming.
  18. Give an advantage of Biological control.
    Can be cheaper in the long term.
  19. Give an advantage of Biological control.
    Does not cause environmental contamination.
  20. Give a disadvantage of Biological control.
    Can be slow to take effect.
  21. Give a disadvantage of Biological control.
    There are few successful examples.
  22. Give a disadvantage of Biological control.
    Skill and research is needed as detailed knowledge of lifestyle is required.
  23. Give a disadvantage of Biological control.
    A frequent input of the predator is needed.
  24. Give a disadvantage of Biological control.
    • The predator may become a pest itself.
    • Eg cane toads or hedgehogs on Uist.

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