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BIO II: Exam 3

Plants

QuestionAnswer
Chlorophyll a - most abundant pigment - absorbs red and blue
Where are light-absorbing pigments organized into? Photosystems in the thylakoid membrane
Light Reactions Convert light energy into chemical energy
Calvin Cycle (Light Independent Rxns) Convert CO2 & chemical energy into sugar
4 stages of Light Reactions 1) Photosystem II 2) ETC 3) Photosystem I 4) ATP-Synthase
1) Photosystem II Light is focused onto central chlorophyll, Photons excite its outer electron - This increases the POTENTIAL ENERGY of the chlorophyll
Reactants of PSII - Light - Water
Reduce of PSII - Chlorophyll oxidizes water - Water is oxidized - Chlorophyll + is reduced - Water is the reducing agent
2) Electron Transport Chain (ETC) - Creates an H+ gradient - HIGH ENERGY e- enter ETC and get passed form one protein to another - Energy released by e- is used to pump H+ (protons) from stroma to lumen - H+ (protons) ions are moved AGAINST concentration gradient form LOW to HIGH
Would the H+ gradient exist in the ETC if light was not present? NO
Created by: emily.zegarra
 

 



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