Psychology 1000 Lecture Notes - Secretion, Uncoupling Protein, Phosphoenolpyruvic Acid

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Laura Fazakas- De Hoog

Document Summary

Roles of light as used by life: light is used as a source of energy and as a source of information about the environment. Advantages to chlamydomonas in being phototactic: eyespot is used for photoaxis - movement towards or away from light, chlamy can thus move toward light because they want to harvest photons for photosynthesis. Region of the electromagnetic spectrum known as visible light : ranges from 400nm wavelength (most energy) to 700nm (least energy, only area of the spectrum visible to the human eye. Relationship between wavelength and energy content of a photon: they are inversely proportional - as wavelength increases, energy decreases. As energy increases, wavelength decreases: most energy - gamma rays (shortest) / least energy - radio waves (longest) Quantitative relationship between photons and excited electrons: only 1 photon can excite 1 electron - photon cannot excite more than one electron and many photons cannot excite one electron.