Biochemistry revision: Signalling

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1. The similarity in structure of G proteins across a diverse selection of organisms suggests

  • G proteins evolved very early
  • G proteins were in bacteria, that were eaten by eukaryotes
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Other questions in this quiz

2. Specialized endocrine cells secrete hormones into the body fluid, often blood and reach virtually all cells, but only act on some cells

  • Endocrine signalling (long distance)
  • Synaptic signalling (local)
  • Paracrine signalling (local)

3. Ligand gated iron channels function as tyrosine kinases

  • False
  • True

4. A secreting cell acts on nearby target cells by discharging molecules of a local regulator into the extracellular fluid

  • Paracrine (local)
  • Endocrine signalling (long distance)
  • Synaptic signalling

5. A tyrosine kinase is an enzyme that catalyzes the transfer of a _________ group from ATP to the amino acid tyrosine on a substrate protein

  • Phosphate
  • Iron
  • Manganese

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