Quiz.5.10.key(2) - just chlorophyll a? The absorption...

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BIO 325H, Spring 2010 Quiz 5 Name_________________________ You have 10 minutes to take this quiz. Read each problem carefully and make sure that you fully answer the questions asked. Good luck! 1. [2 pts.] What do we mean when we say that a biological pigment has an absorption spectrum? A pigment’s absorption spectrum is a measure [usually graphical] of the degree to which the pigment absorbs photons of differing wavelengths/frequencies. [You could have drawn a graph to help illustrate the idea. You could also have said something about how the absorption spectrum relates to an action spectrum in the case of photosynthesis, but it wasn’t necessary to answer the question] 2. [3 pts.] Why is it advantageous to a plant to have two types of chlorophyll (a and b) rather than
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Unformatted text preview: just chlorophyll a? The absorption spectra of chlorophyll a and chlorophyll b are different, allowing a plant harvest the energy of a wider range of light photons for photosynthesis, but it is also critical that the energy captured from a photon that hits either type of chlorophyll can be transferred [by resonance] to the other type. So, even though only chlorophyll a is found in a photosystems reaction center, having both types of chlorophyll in the antenna complex allows the plant to harvest/use a wider range of photon energies/wavelengths/frequencies than it would it if just had chlorophyll a....
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This note was uploaded on 09/12/2010 for the course BIO 325H taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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