The different absorbance spectra expressed by the three types of cone photoreceptors found in the human eye result from differences in the:
A. number of disk membranes found in the cone outer segments
B. stereoisomers of vitamin A found in the cone outer segments
C. type of opsins found in the cone outer segments
D. number of cGMP-gated channels found in the cone inner segments
E. types of bipolar cells with which they synapse
ANS: C
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