TJ7 - Mad Dog Week 7 BISC 220 Supplemental Instruction...

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Mad Dog BISC 220 Supplemental Instruction Week 7 www.usc.edu/si ; [email protected] 1 Lecture 15 (and most of 16): Photosynthesis Our understanding of photosynthesis comes from some really sexy biochemistry. Unfortunately, we first must do a bit of unglamorous plant physiology review: By photosynthesis, plants create their own food. The general term for organisms that are capable of this is: Photosynthesis occurs in the layer of plant cells known as the ______________. Oxygen (O 2 ) flows into the leaf through pores, or ______________. Label the following parts of the chloroplast: a . Stroma: dense fluid within the chloroplast b. Grana: stacks of thylakoids c. Thylakoids: interconnected membranous sacs d. Thylakoid space e. inner membrane f. intermembrane space g . outer membrane In the space below, write the overall reaction for photosynthesis: Look at this guy in reverse. Familiar? Radioactive labeling experiments in the 1950’s have helped elucidate the photosynthetic pathways. Predict the outcomes of each preparation: 1) CO 2 + 2 H 2 O * 2) CO * 2 + 2 H 2 O Engelmann’s experiment (pg. 187) used aerobic bacterial growth to measure oxygen production, itself an indicator of photosynthetic rate. Draw what the results of the experiment would have looked like if performed on algal cells with a high carotenoid content (greater absorption between 460-490 nm)
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Mad Dog BISC 220 Supplemental Instruction Week 7 www.usc.edu/si
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