During phototransduction:
a. hyperpolarisation occurs due to closure of the sodium channels
b. 11-cis-retinal molecules are converted to all-trans-retinal
c. transducin, a G protein converts GDP to GTP
d. all above
a. hyperpolarisation occurs due to closure of the sodium channels
b. 11-cis-retinal molecules are converted to all-trans-retinal
c. transducin, a G protein converts GDP to GTP
d. all above