Cellular signaling pathways are typically terminated by

Answer: Phosphatases (that remove phosphates) and GTPase activity (that turns off G proteins) Signal off-switches: dephosphorylation, GTP hydrolysis on G proteins, ligand removal, receptor internalization.

AP Biology · Topic 4.4

Changes in Signal Transduction Pathways Practice

Part of Cell Communication and Cell Cycle.(IST-3.D)

Practice questions

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Sample questions

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Sample 1difficulty 2/5
$Cellular signaling pathways are typically terminated by$
- A
  $Phosphatases (that remove phosphates) and GTPase activity (that turns off G proteins)$
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- B
  $Continued ligand binding and sustained second messenger production$
- C
  $Cytokinesis (which separates the daughter cells from each other)$
- D
  $Permanent activation of receptors and prolonged kinase signaling$
Why
$Signal off-switches: dephosphorylation, GTP hydrolysis on G proteins, ligand removal, receptor internalization.$
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