LECTURE 9 BILD1 FA11

LECTURE 9 BILD1 FA11 - ANNOUNCEMENTS A review of...

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1 ANNOUNCEMENTS Do homework on website for preview of Exam questions! Midterm Exam #2 next Tuesday, Nov. 1 st in class - Review Session Sunday, Oct. 30 th , 3:00-5:00 PM, Peterson 110 - Exam covers Chapters 8,9,10,12,13 (lectures 6-10). NOT Chpt 11. - Extra TA Office Hours this-next week, as posted! (start Thur.) Midterm Exam #1 regrades returned end of class today. Unclaimed exams can be picked up outside NSB 4119. A review of photosynthesis Light reactions: • Are carried out by molecules in the thylakoid membranes • Convert light energy to the chemical energy of ATP and NADPH • Split H 2 O and release O 2 to the atmosphere Calvin cycle reactions: • Take place in the stroma • Use ATP and NADPH to convert CO 2 to the sugar G3P • Return ADP, inorganic phosphate, and NADP+ to the light reactions O 2 CO 2 H 2 O Light Light reactions Calvin cycle NADP + ADP ATP NADPH + P 1 RuBP 3-Phosphoglycerate Amino acids Fatty acids Starch (storage) Sucrose (export) G3P Photosystem II Electron transport chain Photosystem I Chloroplast rubisco Photosynthetic adaptations to harsh environments PHOTORESPIRATION: On dry, hot days, plants close stomata to conserve H 2 O. CO 2 can’t enter. O 2 builds up ( WHY? ). O 2 can bind competitively to rubisco. Results in 2C compound, broken down to CO 2 and H 2 O. This generates no ATP (unlike respiration) and is very wasteful to the plant! Adaptations have evolved in certain plants to avoid photorespiration, using enzymes other than rubisco to fix C: (1) C4 Pathway (2) CAM Pathway Lecture 9: Mitosis & the Cell Cycle
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2 Cell Cycle Results in cell division into 2 genetically identical cells. Cycle alternates between Interphase and Mitotic phase. Cycle is regulated by molecular control system.
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