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

G protein linked receptors
All of these
Ion-channel linked receptors
Enzyme linked receptors

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Cell Signalling and Transduction
cAMP and cGMP are derived from

ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively
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
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
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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