Cell Signalling and Transduction
Which of the following comes under the category of cell surface receptor?

Enzyme linked receptors
G protein linked receptors
Ion-channel linked receptors
All 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
The signaling molecules called steroid hormones

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

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