BIOL 1000 Lecture 6: BIO midterm

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Electromagnetic radiation: energy converted by the sun, traveling in the form of a wave at a speed light and reaches earth in just over eight minutes. Distinguish different types of e mag radiation by their wavelength and distance between two successive peaks. Wavelength of light: distance between two successive peaks of electromagnetic radiation. Photon: discrete particles or packets of energy ( light is best understood as a wave of photons) Photoreceptor: basic light sensing system (rhodopsin is most common) Absorbing spectrum: curve representing the amount of light absorbed at each wavelength. Dna: molecule that is genetic material of all living organisms. Circadian rhythms: oscillations in behaviour and physiology that have a period of approximately 24 hours. Rhodopsin - trans retinal (activated): consists of a protein called opsin: light sensitive proteins in pr cells that binds a single pigment molecule called retinal. Absorption of a photon of light causes the retinal pigment molecule to change shape.

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