1q- Co-ordination

Question 1

How do multicellular organisms signal between cells?

Answer 1

Using extracellular signalling molecules

Question 2

What are three 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

What does binding do to the receptor ?

Answer 4

Changes its conformation which initiates a response within the cell

Question 5

Different cell type produce specific signals that can…?

Answer 5

Only be detected and responded to by cells with the specific receptor

Question 6

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

Answer 6

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

Question 7

In multi-cellular organisms, different cell types may show what in response to the same signal?

Answer 7

A tissue-specific response