Cell Signalling and Transduction
What is the name of the protein signaling molecule that alters glucose uptake, and where would its receptors be located?

NGF; the nerves involved in simple reflexes
Insulin; many different cell types that use glucose for fuel
Insulin; beta cells of the pancreas
PDGF; the blood

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Cell Signalling and Transduction
Self-phosphorylation is an excellent mechanism for triggering specific catalytic function of the proteins involved in signal cascades because it

makes the receptor more likely to capture the signaling, molecule
allows hydrophilic signaling molecules to cross the plasma membrane
None of these
changes the shape and thus the enzymatic activity of the proteins involved

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Cell Signalling and Transduction
In the signal transduction mechanism known as protein phosphorylation

the signaling molecule binds to a surface receptor
receptor kinases play a key role in triggering the signal cascade
All of these
phosphorylated proteins act with enzymes to trigger the signal cascade

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Cell Signalling and Transduction
Cell signaling can be classified into

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

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