Unit 1 Part 4a (Coordination)

Question 1

How do multicellular organisms signal between cells?

Answer 1

Using extracellular signalling molecules like steroid hormones, peptide hormones and neurotransmitters

Question 2

What are receptors and how do they work?

Answer 2

Proteins with a binding site for a specific signal molecule.
Binding changes the conformation of the receptor, which initiates a response within the cell

Question 3

Why can signalling molecules have different effects on different cell types?

Answer 3

Due to differences in the intracellular signalling molecules and pathways that are involved