UNIT 1 - KA4

Question 1

Where do multicellular organisms signal between

Answer 1

Multicellular organisms signal between cells using extracellular signalling molecules

Question 2

What are examples of extra cellular signalling molecules

Answer 2

Steroid hormones, peptide hormones, and neurotransmitters are examples of
extracellular signalling molecules.

Question 3

What are receptor molecules of target cells

Answer 3

Receptor molecules of target cells are proteins with a binding site for a specific signal molecule

Question 4

What effect does binding have on the receptor

Answer 4

Binding changes the conformation of the receptor, which initiates a response within the cell

Question 5

What do different cell types produce

Answer 5

Different cell types produce specific signals that can only be detected and responded to by cells with the specific receptor

Question 6

What effects may signalling molecules have on different target cell types

Answer 6

Signalling molecules may have different effects on different target cell types due to
differences in the intracellular signalling molecules and pathways that are involved.

Question 7

What may different cell types show to the same signal

Answer 7

In a multicellular organism, different cell types may show a tissue-specific response to
the same signal