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Homework 9 - huynh(hph268 HW9 Sathasivan(49810 This...

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huynh (hph268) – HW9 – Sathasivan – (49810) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Electrons in pigment molecules become ex- cited 1. independent of any outside stimulus. 2. during the Calvin cycle. 3. when light strikes a thylakoid. correct 4. during light-independent reactions. 5. when water molecules are broken down. Explanation: Electrons in pigments become excited when light strikes them. 002 10.0 points Why is the reaction-center in chlorophyll of photosystem I called P700? 1. It is a random name assignment. 2. This pigment is best at absorbing light with a wavelength of 700 nm. correct 3. This pigment absorbs 700 photons per minute. 4. There are 700 chlorophyll molecules in the center. 5. There are 700 photosystem I components to each chloroplast. Explanation: In photosystem I the performance of this pigment is best at absorbing light with a wave- length of 700 nm. 003 10.0 points Which of the following is not directly involved with photosystem II? 1. harvesting of light energy by chlorophyll 2. release of oxygen 3. photolysis 4. photophosphorylation correct 5. P680 Explanation: Photophosphorylation is not directly asso- ciated with Photosystem II. Chlorophyll a in this system by and large absorbs light having
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