Photosynthesis 1: The Light Reactions (Ch. 8)

[Pages:35]Photosynthesis 1: The Light Reactions (Ch. 8)

Plant structure

? Chloroplasts

chloroplast

ATP

H+

HH+ H+ H+tHh+ y+Hla+HkHo++idHH++

? double membrane

? stroma ? fluid-filled interior

outer membrane

inner membrane

? thylakoid sacs

? grana stacks

stroma

? Thylakoid membrane contains

? chlorophyll molecules ? electron transport chain

thylakoid granum

? ATP synthase

? H+ gradient built up within thylakoid sac

Photosynthesis

? Light reactions

? light-dependent reactions

? convert solar energy to chemical energy

? ATP & NADPH

? Calvin cycle

? light-independent reactions

It's not the Dark Reactions!

? sugar building reactions

? uses ATP & NADPH to make C6H12O6

Light reactions

chloroplast

ATP

? Electron Transport Chain

? like in cellular respiration

? proteins in organelle membrane

? electron acceptors

? NADPH ? proton (H+)

gradient across inner membrane

? ATP synthase enzyme

thylakoid

H+ HH+H+H+H+ +H+HH++HH++ H+ HH+H+H+H+ +H+HH++HH++

Chloroplasts transform light energy into chemical energy of ATP

use electron carrier NADPH

generates O2

ATP Synthase H+

H+

H+

H+

H+

H+

H+

H+

ADP + Pi

ATP

H+

A Look at Light

? The spectrum of color

V I B G YO R

Light: absorption spectra

? Photosynthesis gets energy by absorbing wavelengths of light ? chlorophyll a ? absorbs best in red & blue wavelengths & least in green

Why are plants green?

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