Cell Signalling and Transduction
The enzyme that catalyzes the splitting of PIP2 into two molecules of inositol triphosphate (IP3) and diacylglycerol in cell signaling, is

phosphodiesterase C
phospholipase C
phosphokinase C
lipokinase

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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
All of these
Nitric oxide would no longer be produced

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Cell Signalling and Transduction
Cell signaling can be classified into

three distinct types based on the distance over which the signaling molecules act
two distinct types based on the distance over which the signaling molecules act
three distinct types based on the signaling molecules
None of these

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Cell Signalling and Transduction
In the signal transduction mechanism known as protein phosphorylation

phosphorylated proteins act with enzymes to trigger the signal cascade
receptor kinases play a key role in triggering the signal cascade
All of these
the signaling molecule binds to a surface receptor

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Cell Signalling and Transduction
cAMP and cGMP are derived from

ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively
GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively
ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively
None of these

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