How Would the Absence of the Enzyme Photodiesterase PDE) Affect

question 13

Multiple Choice

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

• A) 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.
• B) The lens could not be appropriately adjusted to focus light on the retina, resulting in either nearsightedness or farsightedness.
• C) The opsins found in cones would not be differentiated into the red, blue, and green proteins, causing the animals to be colour blind.
• D) All of the above answers are correct.

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