Cell Signalling and Transduction
Two key organizing principles for large multicellular organisms are

simple nerve reflexes and cell specialization
prokaryotic cell structure and cell specialization
communication between cells and simple nerve reflexes
cell specialization and communication between cells

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Cell Signalling and Transduction
If a disease of the blood vessels caused the endothelial cells of the vessel to die, what effect would that have on the cellular activities associated with vasodilation?

Smooth muscle cells could not be made to relax
It would be more difficult to increase blood flow and reduce blood pressure
Nitric oxide would no longer be produced
All of these

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Cell Signalling and Transduction
When a __________ reaches its __________ , there is a specific means of receiving it and acting on the message. This task is the responsibility of specialized proteins called __________ .

kinase; receptor; proteases
signaling molecule; target cell; receptors
signaling molecule; target cell; G proteins
signaling molecule; receptor; G proteins

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Cell Signalling and Transduction
A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell?

It is in the heart muscle
It is also the site of production for the signaling molecule
It is incapable of signal transduction
It contains the receptor for the signaling molecule

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