AQA Biology A2 Unit 5 Quiz

A quiz testing most (maybe more to come) areas of the unit 5 specification.

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  • Created by: Josh
  • Created on: 03-05-13 18:07

1. Calcium ions bind to [1] on [2] molecules, freeing binding sites for [3] on [4] filaments

  • 1: Troponin, 2: Tropomyosin, 3: Myosin heads, 4: Actin
  • 1: Tropomyosin, 2: Myosin heads, 3: Actin, 4: Troponin
  • 1: Actin, 2: Tropomyosin, 3: Myosin heads, 4: Troponin
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2. [1] may bind to [2] and 'guide' it to [3] to which [1] has [4], the [2] then cuts the [3], preventing translation.

  • 1: mRNA, 2: a hydrolytic enzyme, 3: siRNA, 4: a complementary base sequence
  • 1: siRNA, 2: a hydrolytic enzyme, 3: mRNA, 4: a complementary base sequence
  • 1: a hydrolytic enzyme, 2: siRNA, 3: mRNA, 4: a complementary base sequence

3. Which of the factors affecting nervous impulse velocity has the most significant effect?

  • Myelination
  • Axon diameter
  • Temperature

4. A response whose randomness elevates alongside increasingly unfavourable conditions is a ___?

  • Kinesis
  • Taxis
  • Tropism

5. Which of the following lists mechanisms for thermoregulation utilised by both endo- and ectotherms?

  • Behavioural adaptation, colour change
  • Behavioural adaptation, colour change, alteration of metabolic rate
  • Alteration of metabolic rate, vasoconstriction/-dilation

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