BIOL 1500 Study Guide - Circadian Clock, Accessory Pigment, Electromagnetic Spectrum
20 Mar 2013
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Document Summary
The portion of the electromagnetic spectrum that humans can detect with their eyes. Categorized as a wave (stream of energy particles) These particles are categorized as photons (visible light particle) Photons have no energy or mass but have precise amount of energy. Blue light has a shorter wavelength = less photons = less energy than red light. Sunburn = human response to light, shows some physical manifestication on you to know that these particles exist. Radiowaves = hearing noise is a direct result that it exists. Photoreceptor: a basic light-sensing protein system invovled in sensing and responding to light (contains a protein + pigment, the pigment absorbs light photon while the protein undergoes conformational change) Eyespot: a heavily pigmented region in certain one-celled organisms that function as a light sensor. A molecule that can absorb photons of light (they differ by different wavelengths each can absorb, depending on its structure)
