Quiz9_key - BIL 151 Lab section K1/U4 Name Quiz 9 1 Which...

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BIL 151 Lab section K1/U4 Name:_________________________________________ Quiz 9 1) Which are not photosynthetic pigments found in spinach? a. Carotenoids b. Keratins c. Xanthophylls d. Chlorophylls 2) What did you use paper chromatography to do with the pigments you extracted from spinach? To separate the pigments 3) Why did different pigments migrate different distances on the chromatography paper? a. Each pigment has a different affinity for the paper b. Each pigment has a different migration rate up the paper c. Each pigment is soluble to a different degree in the solvent d. All of the above 4) How does fluorescence change the absorbance spectrum of isolated chlorophyll? In chlorophyll that has been isolated from the thylakoid membrane, a photon is absorbed and excites the electrons.
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Unformatted text preview: Since the electrons do not have a primary electron acceptor to take them, they release their energy as photons. The transfer of energy, however, is not 100% effective, so some energy is released as heat first. The remaining energy is released as low-energy photons in the red spectrum. 5) Can fluorescence occur in living plants? Explain for full credit. In theory, no. When chlorophyll is in the thylakoid membrane of living plants, the primary electron acceptor will take the excited electrons from P680 and P700 to generate chemical energy for the plant. Chlorophyll fluorescence does occur in nature though, when plants absorb more light than they are able to photosynthesize. Everyone got credit for this question....
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