State Whether Each of the Following Is True for R-Opsin

Essay

State whether each of the following is true for r-opsin, c-opsin, both, or neither.
A. Believed to detect light for circadian rhythm regulation
B. Hyperpolarizes neurons when activated by light
C. Opens an ion channel when activated by light
D. Works with a G protein and second messenger to regulate ion channels
E. Only found in chordates
F. Only found in invertebrates