The Sodium Leak Channels in Photoreceptors Are Cyclic GMP-Gated Channels

question 193

Multiple Choice

The sodium leak channels in photoreceptors are cyclic GMP-gated channels. What must occur during activation of photoreceptor cells by light?

• A)Cyclic GMP levels are reduced.
• B)Cyclic GMP levels are increased.
• C)Cyclic GMP is exchanged for cyclic AMP.
• D)Cyclic GMP is exchanged for GTP.

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