BIOL 1000 Study Guide - Final Guide: Thermodynamics, Dynein, Sterol
Document Summary
The colour and energy emitted depends on the wavelengths (the distance for a full wave). Light serves for the purpose of energy only by being absorbed. Additionally, light can be used for information about the physical world (visual attracting, visual signalling, camouflage, etc). The absorption of light causes an electron to become excited and climb orbitals. Since the nature of electrons is at ground state, it emits its absorbed energy to go back. Light can also provide energy using light-dependant proton pumps. Pigments are molecules that can absorb photons of light, giving them their colour. Made up of alternating double and single carbon-covalent bonds (conjugated system). Photoreceptors -- a molecule that absorbs light and generates a response (ex: rhodopsin). Vision requires photoreceptors at the back of the retina (opsin) to stimulate a response through the optic nerve Colour vision requires cone cells to absorb either blue, red or green.
