co-ordination

Question 1

how do multicellular organisms signal between cells (achieve coordination)?

Answer 1

Multicellular organisms signal between cells using extracellular signalling molecules (and complementary receptor molecules)

Question 2

examples of extracellular signalling molecules

Answer 2

• steroid hormones
• peptide hormones
• neurotransmitters
  are examples of extracellular signalling molecules.

Question 3

receptor molecules of target cells are _______ with a ________ ______ for a ________ ____________.

Answer 3

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

Question 4

Binding changes what on the receptor and this leads to?

Answer 4

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

Question 5

different cell types produce ________ ________ that can only be _______ and _______ to by cells with the _______ __________.

Answer 5

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

Question 6

signalling molecules ___ have _____ ______ on ______ ____ ______ due to differences in the __________ __________ __________ and __________ that are involved.

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

in a multicellular organism, different ____ _______ may show a _______ - _________ response to the same ______.

Answer 7

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