Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 34, Problem 5TY
Summary Introduction

Introduction:

Cone pigments are visual opsins that are found in vertebrate cone cells. They are photoreceptor molecules that are responsible for photopic vision that means presence of different types of cone pigments enables color vision.

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key function of rod photoreceptors is to: detect colors detect fine details in the visual field. detect light under low levels of illumination. detect light under high levels of illumination. During phototransduction, transducin activates phosphodiesterase (PDE) that converts: GTP to GDP CGMP to GMP retinal cis to retinal trans retinal trans to retinal cis
How are Ca2+ channels involved in phototransduction? they cause neurotransmitter release even if no action potentials are produced are not affected by PDE activation in the outer segments when open, they lead to hyperpolarization in photoreceptors in darkness, they do not rely on CGMP levels The density of cones in the retina: is highest where cone outer segments increase in diameter is lowest where retinal blood vessels are absent is drastically less than that of rods in the fovea is indicative of what areas are associated with acuity The recycling of rhodopsin.
Place the following into the correct order to represent the bleaching and regeneration of rhodopsin. Opsin and cis-retinal enzymatically combine to regenerate rhodopsin Trans-retinal is enzymatically converted back to cis-retinal Cis-retinal isomerizes to trans-retinal Trans-retinal separates from opsin Opsin triggers reaction cascade that breaks down cGMP Rhodopsin absorbs photon of light www Next >
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