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SBI4U1 Metabolic Processes

This document focuses on metabolic processes relevant to SBI4U1, particularly photosynthesis and photorespiration. It covers the role of Rubisco in adding oxygen to RuBP, producing PGA and glycolate, which can be released as CO2. The differentiation between G3P production in photosynthesis versus PGA and glycolate in photorespiration is highlighted. Additionally, it explores CAM plant processes, detailing the creation of malate during nighttime, storage in vacuoles, and the implications of transpiration rates in hot, dry environments.

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SBI4U1 Metabolic Processes

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  1. C4 & CAM: Questions SBI4U1Metabolic Processes Ms. Ponvia

  2. Work on the following questions: p. 172 # 1, 2, 3, 6, 8

  3. P. 172 A process whereby oxygen is added to RuBP by Rubisco, creating PGA and glycolate which can then be released as CO2 Oxygen

  4. P. 172 c) 20% d) Photosynthesis: G3P is produced, while in photorespiration: PGA and glycolate are produced

  5. P. 172

  6. P. 172 CO2 plasmodesmata OAA Mesophyll cells Bundle-sheath cells pyruvate

  7. P. 172 a) Malate is product of carbon fixation – occurs during night time in CAM plants. Thus late at night will find most malate. b) At end of day, when most malate have been converted back to pyruvate.

  8. P. 172 c) Hot, dry, desert environment prohibits opening of stomata during the day as transpiration rate (water loss) will be too high.

  9. P. 172 d) CO2 e) CO2 is incorporated into a 4C organic acids using PEP carboxylase & stored in vacuoles until morning.

  10. P. 172 More organic acids in the CAM plants that have been kept in the dark for 24 hours. (Recall, night time is when CO2 is incorporated into a 4C organic acid by PEP carboxylase.)

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