Cell Signalling and Transduction
A signal cascade induced by adrenaline or thyroxine

involves the activation of a G protein
All of these
results in the activation of a sequence of enzymes needed for the cell effect
must begin with receipt of the signal molecule by a surface receptor

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Cell Signalling and Transduction
The signaling molecules called steroid hormones

are made in one location of the body but have their effects some distance away
bind to cell surface receptors to trigger chemical cascades
are hydrophilic and so cannot penetrate the plasma membrane
never enter the blood of humans

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Cell Signalling and Transduction
Cell signaling can be classified into

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

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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
Since it can enter the cell, it directly affects some specific cell process
Its receptor is located in the cytosol of the target cell
It is a steroid

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