Cell Signalling and Transduction
Cell signaling can be classified into

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

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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 __________ .

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

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

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

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