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. Summarise the differences between DNA and RNA.

  • The backbone of DNA is based upon deoxyribose whereas RNA's backbone is based upon ribose, RNA uses uracil in place of thymine.
  • The backbone of DNA is based upon ribose whereas RNA's backbone is based upon deoxyribose, RNA uses uracil in place of thymine.
  • The backbone of DNA is based upon ribose whereas RNA's backbone is based upon deoxyribose, RNA uses uracil in place of adenine.
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2. 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

3. During striated muscular contraction:

  • The sarcomere lengthens, the H zone remains the same size, the A and I bands both shorten
  • The sarcomere, I band and H zone become narrower, the A band maintains its width
  • The sarcomere and H zone become narrower, the A and I bands maintain their

4. Describe the role of ATP in the sliding filament theory.

  • ATP binds to troponin molecules on the actin, releasing the myosin head
  • ATP binds to myosin head, releasing it from actin, then it is hydrolysed to ADP, 'recocking' the head.
  • ATP binds to the myosin head, altering the myosin tail's angle, pulling the actin along

5. During vasoconstriction...

  • ...the arterioles feeding the skin capillaries contract, and so do the shunt vessels.
  • ...the arterioles feeding skin capillaries contract using C-muscles and the shunt vessels dilate
  • ...the arterioles feeding the skin capillaries dilate by relaxing C-muscles, and the shunt vessel contracts

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