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14 Cards in this Set

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Light can be characterized as what two things?
Waves and photons (particles)
The energy carried by a photon is called what?
Quantum
What carries more energy per photon of light, shorter or longer wavelengths?
Shorter
Name 4 physical processes that excited state molecules return to their ground state and describe each one.
1.) Fluorescense - photon emission as an electron relaxes from the first singlet excited stage to the ground state
2.) Phosphorescense - formation of a metastable triplet and photon emission as an electron relaxes from the triplet excited state to the ground state
3.) Thermal deactivation - heat loss to the enviroment
4.) Inductive resonance (radiationless transfer) - energy transfer between neighboring pigment molecules
What is photooxidation?
The photochemical process by which a pigment molecule loses an electron in response to light
What is the difference between absorbtion spectra and action spectra?
Absorbtion specra reflect the probability that light of a certain wavelength will be absorbed by a given molecule. Action spectra reflect the intensity of a biological as a function of the wavelength.
What are 4 important parameters to determine when describing light?
Quantity, quality, timing, and duration.
What is fluence?
Quantity of radiant energy falling on a small sphere divided by the cross section of that sphere.
Photon fluence is described in what units?
mol m-2 s-1
Energy fluence is described in what units?
J m-2 s-1
Where is solar energy used for photosynthesis initially abosrbed at?
Pigments located in the chloroplast
What are the primary photorecptors in higher plants compaed to diatoms, dinoflagellates, brown algae, and red algae.
Higher plants use chlorophyll a and b while red algae used chlorophyll d and the rest use chlorophyll c.
What are carotenoids and what are two types of them? What are their functions?
Lipid soluble yellow, orange, and red pigments that are either pure hyrocarbons (carotenes) or contain oxygen atoms (xanthophylls). To serve as both "antenna" pigment photoreceptors for light absorbtion during photosynthesis and as photoprotective agents (i.e. antioxidants) to quench excited state chlorophylls and reactive oxygen species.
Chlorophyll contains a Mg containing porphyrin head. Whhat happens when chlorophyll is exposed acidic solutions?
The magensium molecule literally pops right out of the chlorophyll, which is why plants experience magnesium deficiencies (and thus loss of green color, or chlorotic) when put in soils with a low pH.