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Cell Signalling
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Cell signalling process table. OCR A: A level biology revision notes. Module 5: Communication, Homeostasis and Energy. A* biology student's notes. Summary of key content to be memorised. Process that needs to be memorised from specification.

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  • December 4, 2023
  • 1
  • 2022/2023
  • Other
  • Unknown

Subjects

  • cell signalling
  • process
  • flashcard
  • a level
  • biology
  • ocr a
  • homeostasis
  • communication
  • energy
  • module 5
  • revision notes
  • process table

Written for

  • A/AS Level
  • OCR
  • Biology A
  • Unit 5
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Cell Signalling – Non-Steroid Cell Signalling – Non-Steroid
Hormones Hormones
The hormone itself is known as the
first messenger, and it binds to a
receptor on the cell surface
membrane.
This causes the release of a G protein
in the membrane which activates the
enzyme adenyl cyclase.
Adenyl cyclase is an enzyme that
converts ATP into cyclic AMP.
Cyclic AMP is the secondary
messenger molecule, it activates a
cascade of enzyme-controlled
reactions that alter the activity of the
cell.



Cell Signalling – Steroid Hormones Cell Signalling – Steroid Hormones.
The steroid hormone passes directly
through the phospholipid bilayer
(since it is lipid soluble).
The hormone binds to a receptor in
the cytoplasm.
The receptor-hormone complex
enters the nucleus of the cell and acts
as a transcription factor on DNA.
It will either promote or inhibit the
transcription of a gene.

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