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
lipokinase
phosphokinase C
phospholipase C

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Cell Signalling and Transduction
Which of the following is true about a hydrophilic signaling molecule?

It is a steroid
It might trigger a signal cascade that causes some effect in a cell
Its receptor is located in the cytosol of the target cell
Since it can enter the cell, it directly affects some specific cell process

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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
the signaling molecule binds to a surface receptor
receptor kinases play a key role in triggering the signal cascade
All of these

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Cell Signalling and Transduction
Cell signaling can be classified into

None of these
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

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