KA4: communication and signalling: co-ordination

Question 1

multicellular organisms signal between…

Answer 1

…cells using extracellular signalling molecules

Question 2

give examples of extracellular signalling molecules

Answer 2

-steroid hormones
-peptide hormones
-neurotransmitters

Question 3

what are receptor molecules of target cells?

Answer 3

proteins with a binding site for a specific signal molecule

Question 4

describe the effect of binding on receptors

Answer 4

-changes the conformation of the receptor
-initiates a response within the cell

Question 5

what do different cell types produce?

Answer 5

specific signals that can only be detected and responded to by cells with the specific receptor

Question 6

why might signalling molecules have different effects on different target cell types?

Answer 6

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

Question 7

in multicellular organisms, different cell types may show…

Answer 7

…a tissue-specific response to the same signal