Photosynthes is AP Biology Ch 10 Free Energy

Photosynthes is AP Biology Ch. 10

Free Energy • Is everywhere (Light is a form of electromagnetic radiation)…

Quick Review: Energy • All energy on earth comes from the sun* • To convert light energy into chemical energy we depend on: • Plants (chloroplasts) • Protists (chloroplasts) • Cyanobacteria (cell membrane)

Leaf Structures • Mesophyll cells: • Contain many chloroplasts for photosynthesis • Stoma cells: • Guard cells allow for gas exchange

Chloroplast Structures • Thylakoids: • Disk-like structures filled with chlorophyll • Stroma • Surrounding fluid

Chlorophyll Function • A pigment which absorbs electromagnetic radiation

Plants are green because. . . • Absorbs two wavelengths of light: • Blue: 420 nm • Red: 660 nm

Photosynthesis CO 2 + H 2 O C 6 H 12 O 6 + O 2 carbon dioxide + water glucose + oxygen

Light Dependent Reactions

Light Dependent Reactions • Sunlight strikes the PSII and excites electrons • Excited electron splits H 2 O into H+ ions and O 2 gas

Light Dependent Reactions • Electrons flow through a series of membrane proteins moving H+ ions across the membrane

Light Dependent Reactions • Sluggish electrons receive another photon of light in PSI • Excited electrons are passed to NADP changing into NADPH

Light Dependent Reactions • Collection of H+ ions pass through ATP synthase • ADP is converted into ATP

Animation Light Dependent Rxn. • http: //highered. mcgrawhill. com/olcweb/cgi/pluginpop. cgi? it=swf: : 535: : /sites/dl/free/0072 437316/120072/bio 13. swf: : Photosynthetic%20 Electron%20 Transport %20 and%20 ATP%20 Synthesis

Light Independent Reactions

Light Independent Reactions • NADPH & ATP generated in light reactions run the Calvin Cycle • CO 2 is converted into G 3 P through a series of reactions

Light Independent Reactions • Many cycles produce glucose (C 6 H 12 O 6) in stroma

Animation Light Independent Rxn. • http: //highered. mcgrawhill. com/sites/0070960526/student_view 0/chapter 5/anima tion_quiz_1. html

Photosynthesis Overview

Youtube Raps Average: • http: //www. youtube. com/watch? v=yt. LJFYyf. LV 8&safety_ mode=true&persist_safety_mode=1 Awesomeness: • http: //www. youtube. com/watch? feature=endscreen&NR= 1&v=x-t 0 s. Gyjfto