General unit 5 biology

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  • Created by: Sapphire
  • Created on: 13-06-13 16:24

1. What do antagonistic drugs do to synaptic transmission?

  • stimulate release of neurotransmitter from presynaptic neurone so more receptors are activated
  • They block receptors so they cant be activated by neurotransmitters
  • inhibits the enzyme that breaks down neurotransmitters
  • More receptors are activated as drugs same shape as the neurotransmitters
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Other questions in this quiz

2. What is electrophoresis?

  • Separates RNA fragments to make a fingerprint
  • Separation of DNA fragments to make a genetic fingerprint
  • The combination of smaller DNA fragments to make a genetic fingerprint
  • Splitting of DNA with light

3. Which of these is the cloning of a gene outside a living organism?

  • In vevo
  • In vitro
  • In vivo
  • En vitro

4. Do chemical mediators stimulate local response or widespread response?

  • Local
  • Widespread

5. What is hyperpolarisation?

  • When ion channels are reset.
  • When potassium ion channels are slow to close so there is a slight overshoot where too many potassium ions diffuse out of the neurone. The potential difference becomes more negative than the resting potential
  • When sodium ion channel close and potassium ion channels open. The membrane is more permeable to potassium so potassium ions diffuse out of the neuroe
  • If the potential reaches the threshold value, more sodium ion channels open. More sodium ions diffuse into the neurone.


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