The Following Steps Occur in Rods When They Are Excited

question 55

Multiple Choice

The following steps occur in rods when they are excited by photons of light. What is the proper sequence for these steps?
1) Membrane sodium channels close.
2) Increased phosphodiesterase breaks down cGMP.
3) Retinal changes from the 11-cis form to the 11-trans form.
4) The membrane hyperpolarizes and the rate of neurotransmitter release declines.
5) Opsin activates transducin.
6) Opsin activation occurs.

• A) 1, 6, 5, 2, 4, 3
• B) 3, 6, 5, 2, 1, 4
• C) 6, 3, 5, 2, 1, 4
• D) 3, 6, 5, 1, 2, 4
• E) 1, 3, 4, 5, 6, 2

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