Indicate whether each of the following descriptions applies to visual signal transduction (V), olfactory signal transduction (O), or both (B). Your answer would be a four-letter string composed of letters V, O, and B only, e.g. VOVV.
( ) It involves cGMP as a second messenger .
( ) A rise in cyclic mononucleotide concentration follows the arrival of the signal.
( ) The signal is received by a G-protein-coupled receptor.
( ) An incoming signal leads to membrane hyperpolarization.