How Would the Absence of the Enzyme Photodiesterase (PDE)affect Vision

question 40

Multiple Choice

How would the absence of the enzyme photodiesterase (PDE) affect vision in the vertebrate eye?

• A)The opsins found in cones would not be differentiated into the red,blue,and green proteins,causing the animals to be color blind.
• B)The cGMP-gated sodium channels would remain open,glutamate would be continuously discharged at the synapses,and the brain would not detect light absorbed by the rod cells.
• C)The lens could not be appropriately adjusted to focus light on the retina,resulting in either nearsightedness or farsightedness.
• D)All of the above answers are correct.

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