1.4 Communication and Signalling Flashcards
1
Q
What do multicellular organisms communicate using?
A
Extracellular signalling molecules.
2
Q
What are examples of signalling molecules?
A
- Steroid hormones
- Peptide hormones
- Neurotransmitters
3
Q
What are receptor molecules of target cells?
A
Proteins with a binding site for a specific signal molecule.
4
Q
What does the binding of a signal molecule cause?
A
Changes the conformation of the receptor which initiates a response in the cell.
5
Q
What is the biological significance of extracellular signalling?
A
- Co-ordination of cell responses
- Communication between cells in different parts of the body
- Detection and response to change
