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Review Questions
Q: In what ways does the eye resemble a camera? Q: What are the principal types of light sensing cells in the vertebrate retina? Q: What is the general structure of rhodopsin? Q: What is the effect on rhodopsin of absorbing a photon? Q: Under fully dark-adapted conditions, how many photons must be absorbed by the human retina for an observer to reliably detect a flash of light? Q: Why can humans not reliably detect the absorption of a single photon? Q: Signal transduction in the photoreceptor outer segment uses a series of coupled enzyme reactions. What advantage or disadvantage is conferred by this arrangement? |
