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

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

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Cell Signalling and Transduction
A cell is known to respond to a particular signaling molecule. Which of the following must be true of this cell?

It is also the site of production for the signaling molecule
It is incapable of signal transduction
It is in the heart muscle
It contains the receptor for the signaling molecule

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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
never enter the blood of humans
are hydrophilic and so cannot penetrate the plasma membrane

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Cell Signalling and Transduction
Two key organizing principles for large multicellular organisms are

prokaryotic cell structure and cell specialization
simple nerve reflexes and cell specialization
cell specialization and communication between cells
communication between cells and simple nerve reflexes

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