Unit 1 - Topic 4 - Communication and signalling - Section A - Co-ordination Flashcards
1
Q
How do multicellular organisms signal between cells
A
Using extracellular signalling molecules
2
Q
Examples of extracellular signalling molecules include
A
Steroid hormones, peptide hormones, and 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 binding do
A
Binding changes the conformation of the receptor, which initiates a response within the cell
5
Q
Why do signalling molecules have different effects on different target cell types
A
Differences in the intracellular signalling molecules and pathways that are involved.
6
Q
In a multicellular organism what may different cell types show
A
A tissue-specific response to the same signal
