Biology 1202B Lecture 4: Wed, Jan. 16:19 – Lecture 4- Light, Energy and Thermodynamics
26 Feb 2019
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Wed, jan. 16/19 lecture 4: light, energy and. Structure and function of rhodopsin and how it sends signals to the visual cortex via transducin and. Source of energy: bio photosynthesis - g3p , ultimate source of proteins, carbohydrates, fats is from the energy from photons. Single cell, eukaryotic organism: photosynthesis, aerobic respiration, anaerobic, phototransduction, flagella. Rhodopsin: energy by photons is captured from rhodopsin, retinal is the pigment that captures the photon and the energy triggers a cascade --> optic nerve, optic nerve to lgn --> visual cortex -> image. Specific structure, what allows them to absorb photons. Chlamydomonas: carotenoids, eyespot; place where the photoreceptors are. 2: doesn"t always move toward the light. Selectively activate neurons in the mice brain: uses channel rhodopsin, control and targets specific neurons. Sensing light with eyes: rods contains rhodopsin = opsin (protein) + retinal (pigment, light cis form to trans form, trans form has to be recycled to initiate another phototransduction cascade.
