BIOL 1000 Lecture Notes - Endoplasmic Reticulum, Circadian Rhythm, Anoxygenic Photosynthesis
Document Summary
Photoreceptor a light sensor made of protein and associated pigment, light hits pigment and makes conformational change in pigment which makes a change in protein (signal transduction cascade) Third diagram light passes through cornea and back lens the retina. Blind spot on the retina, allows optic nerve to be sent through retina to the brain. Circadian rhythm- you use light to set your biological clock, not necessarily if its dark you sleep. Also, its controlled by an internal (endogenous) organism-based clock. Melatonin production may be low in some people. Blind animals still have photoreceptors so they"re able to set a biological clock. Coevolution- adaptations make 2 or more populations evolve, and they interact with each other. Some vertebrates (organisms with a backbone) don"t see the sun. Light is the visible region of the electromagnetic spectrum. It is a source of energy and information. It plays a role in the behaviour and ecology of all organisms (circadian rhythms)
