SI session Oct. 30 Ch. 11 answers

SI session Oct. 30 Ch. 11 answers - Kaiser Imam BIOL 215 SI...

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Kaiser Imam October 30, 2007 BIOL 215 SI Session Chapter 11 Chapter 11: Photosynthesis 1. Fill in the following diagram of a chloroplast. 2. Write a general chemical equation for the final products of oxygenic photosynthesis. 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 3. Write a general expression for the direct products of photosynthesis by oxygenic phototrophs. light + 3CO 2 + 6H 2 O → C 3 H 6 O 3 + 3O 2 + 3H 2 O 4. Take a look at Figure 11-5 in your book. What colors in the visible spectrum do both forms of chloroform absorb? What colors do they reflect? Chlorophyll is best at absorbing wavelengths of light at the red and blue ends of the visible spectrum. It does not absorb the green wavelengths at the center but rather reflects those photons. That’s why most plants appear green. 5. What is the purpose of the other pigments shown in Figure 11-5? The other pigments shown are known as accessory pigments and they absorb photons that cannot be captured by chlorophyll. This enables the plant to collect photons from a much larger part of the visible spectrum than would be absorbed by chlorophyll alone. Accessory pigments are found in some leaves in plants but in much lower concentration than chlorophyll. 1
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Fill in the blanks: 6. During the __ energy transduction __ reactions of photosynthesis light is captured by molecules of the pigment __ chlorophyll __ and converted to chemical energy in the form of __ ATP __ and the reduced coenzyme __ NADPH __. 7. During the carbon assimilation reactions, commonly known as the __ Calvin cycle __, fully oxidized carbon atoms from __ carbon dioxide __ are __ reduced __ and __ covalently attached __ to organic acceptor molecules to form __ carbohydrates __. 8. The carbohydrates directly produced in photosynthesis are not six-carbon sugars but rather __ triose phosphates __ that contain __ 3 __ carbon molecules. 9. The electron transport complex in photosynthesis is located in the __ thylakoid __ membrane. Hydrogen ions are pumped into the __ thylakoid lumen __ and ATP is pumped into the __ stroma __. 10. Each chlorophyll molecule has a central __ porphyrin __ ring with a strongly hydrophobic __ phytol __ side chain attached. The alternating __ double bonds __ in the ring are responsible for absorbing visible light. The ring contains a __ magnesium __ ion that affects electron distribution in the ring. 11. Chlorophyll a has a __ methyl (—CH 3 ) __ group attached to its porphyrin ring and has a __ wider __ absorption spectrum than chlorophyll b , which has a __ formyl (—CHO) __ group attached to the ring. 12. Chlorophyll a and b are found in all __ plant __ and __ green algae __ cells. In other oxygenic photosynthetic organisms chlorophyll __ a __ is supplemented with some other pigment. 13. How does photoexcitation work in pigment molecules? How does this relate to photochemical reduction? When a photon is absorbed by a pigment such as chlorophyll the energy of the photon is transferred to an electron, which is energized from its ground state in a low-energy orbital to an excited state in a high-energy orbital. A photoexcited electron is not stable and
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