Cell Signalling and Transduction
Which of the following statements about G proteins is false?

They bind to and are regulated by guanine nucleotides
They are involved in signal cascades
They must be active before the cell can make needed cAMP
They become activated when bound to GDP

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

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

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Cell Signalling and Transduction
Cell signaling can be classified into

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

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