40) What would occur at location number 4 in the figure in the absence of light?

Question

40) What would occur at location number 4 in the figure in the absence of light? a. cGMP would detach itself from the sodium channels, causing them to close. b. cGMP attached to the sodium channels would cause them to open. c. Darkness would inactivate rhodopsin by isomerizing retinal from cis to trans. d. Darkness would inactivate rhodopsin by isomerizing retinal from trans to cis. 41) Which sense perception depends on a metabotropic mechanism for initial signal transduction? a. Auditory reception b. Touch c. Bitter taste d. Head movements associated with acceleration 42) In the mechanism of vertebrate olfaction, a G protein activates the enzyme... a. cGMP phosphodiesterase. b. phospholipase C c. adenylyl cyclase d. transducin.

Explanation / Answer

40) b- cGMP attached to the sodium channels would cause them to open. (the level of cGMP is high in the dark)

41) b- Touch

42) c- Adenylyl cyclase

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