Which of the following statements with regard to vision is FALSE?
A. There are two basic types of photoreceptors in the retina, rods, and cones.
B. There are normally four different photopigments in the retina.
C. Photoreceptors are neurons.
D. There are four different chromophore molecules in the retina.
E. There are four different opsins in the retina.
Answer: D
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