BIS 2A Lecture Notes - Lecture 5: Plasmolysis, Extracellular Fluid, Cytosol
Document Summary
Electromagnetic spectrum: range of all possible radiation frequencies. Each colour of light has a characteristic wavelength. Number of times in an interval a wave passes a fixed point. The larger the frequency the shorter the wavelength. Red lower energy, lower frequency, bigger wavelength. Purple/blue higher energy, higher frequency, bigger wavelength. Everything in the cell has a pigment, which can absorb different wavelengths. Ring-like structure with differing attachments to make them distinct. Absorb excess energy in light and disperse it as heat. Each pigment has a different absorption spectrum based on structure. Whatever colour wavelength it reflects (doesn"t absorb) is the colour it appears to be (ex: chlorophyll a appears green) Carotenoids absorb cooler colours and reflect reds and yellows. Process of transferring energy from light into chemicals (into atp) 1-absorption of a photon by a pigment molecule. 2-light energy is transferred to the pigment and excites the electrons. Electron can relax and release heat energy.
