Random Past Paper Questions Flashcards

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1
Q

Describe the induced fit model of enzyme action and how an enzyme acts as a catalyst (3)

A
  1. Substrate binds to the active site
  2. Active site changed shape so its complimentary to substrate
  3. Which reduces activation energy
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2
Q

Explain the advantage for larger animals of having a specialised system that facilitates oxygen uptake. (2)

A
  1. Larger organisms have a smaller surface area: volume ratio
  2. So faster diffusion / short diffusion pathway
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3
Q

Explain how the counter-current principle allows efficient oxygen uptake in the
fish gas exchange system. (2)

A
  1. Blood and water flow in opposite directions
  2. Diffusion/concentration gradient (maintained) along (length of) lamella/filament;
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4
Q

Describe how one amino acid is added to a polypeptide that is being formed at a ribosome during translation

A
  1. tRNA brings specific amino acid (to ribosome);
  2. Anticodon (on tRNA) binds to codon (on mRNA);
  3. Amino acids join by condensation reaction (using ATP)
    OR
    Amino acids join to form a peptide bond (using ATP);
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