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Chapter 1

BI111 Chapter Notes - Chapter 1: Bacteriorhodopsin, Phytochrome, Chemical Energy


Department
Biology
Course Code
BI111
Professor
David Smith
Chapter
1

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A Green Algea
Using light for both energy and information
Eyespot: light sensor
The Sun
The reason there is life on earth
Electromagnetic Spectrum
Ranges from gamma rays to radio waves; visible light and the
wavelengths used for photosynthesis occupy a narrow band of
the spectrum
The longer the wavelength, the lower the energy of the
photons it contains. The shorter the wavelength the higher
the energy of the photons it contains

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What is Light?
Definition of light: Electromagnetic radiation that humans can
detect with their eyes
A wave of discrete particles called photons
Wavelength: Distance between two successive peaks
To be used, light energy must be absorbed by molecules
called pigments
Light Interacting With Matter

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Pigment Structure
Conjugated system
Alternating double/single carbon bonds
Delocalization of e-
Photosynthesis ->
Vision ->
Red photosynthetic algea ->
Absorption of Light by
Chlorophyll
Colour is the result of
wavelengths of light that are not absorbed by a pigment
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