Cell Signalling and Transduction
In terms of cell communication, what do bacterial pathogens such as cholera and anthrax have in common?

They block the normal functioning of signal transduction mechanisms
They alter the chemical structure of key signaling molecules
They destroy the receptors for key signaling molecules
They prevent the production of key signaling molecules

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

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

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Cell Signalling and Transduction
Why is it that inhaling nitric oxide reduces blood pressure only in the lung tissue and not elsewhere in the body*?

Because nitric oxide breaks down quickly and thus cannot travel far
None of these
Because nitric oxide cannot cross cell membranes and enter the blood
Because other body tissues use a different signaling molecule

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