Biology 1002B Midterm: Cycle 2 Outcomes
10 Feb 2017
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C(cid:455)cle 2: trappi(cid:374)g light for e(cid:374)erg(cid:455) & i(cid:374)fo. Definition of light: light: the portion of the emr spectrum that humans can detect with their eyes. Particle-wave duality: behaves as a wave and and a stream of photon particles. Molecular characteristic of pigments that make them able to absorb light: pigments: a class of molecules efficient at absorbing photons (e. g. chlorophyll , retinal, indigo) Conjugated system: region where carbon atoms are bonded with alternating single and double bonds. Available to interact with photons since they are not involved in bonding. Absorbs light at different wavelengths (can absorb single or multiple wavelengths) Different chemical structures -> different excited states available. Bound tightly to proteins -> pigment-protein complex. Understanding of why biological systems only absorb visible wavelength of the electromagnetic spectrum: short wavelengths: Contain enough energy to destroy chemical bonds: long wavelengths: Absorbed by water vapour and carbon dioxide in the atmosphere.
