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HCC Bio101 Topic 12

Photosynthesis (Fall 2011) Berlyn

QuestionAnswer
What is the overall reaction for photosynthesis? Water + CO2 + Light energy --> Carbohydrate + O2
What three things do green plants do (to our benefit)? - Convert light to chemical energy - Convert CO2 to carbohydrate - Release Oxygen from Water
What are the four photosynthetic pigments and what colors are they? Carotene (orange), xanthophyll (yellow), chlorophyll a (blue-green) and chlorophyll b (yellow-green)
What colors of light are best absorbed by the photosynthetic pigments? red and blue-violet
What happens when water loses one electron? Two? When water loses one electron, a hydrogen ion separates. When water loses two electrons, it breaks apart into an oxygen atom and two hydrogen ions
What is photophosphorylation? The use of light energy to add a phosphate group to ADP to make ATP
What are the three major products of non-cyclic photophosphorylation? ATP, O2 and NADPH
After NADP+ gains two electrons, what charge does it possess? It becomes negatively charged
Once NADP+ becomes NADP-, what happens to it? It attracts a hydrogen ion and becomes NADPH
What is the major product of cyclic photophosphorylation? ATP synthesized in electron transport
Which photosystem is NOT involved in cyclic photophosphorylation? Photosystem II
What is the major accomplishment of photosynthesis that is not part of the light-dependent reactions? The reduction of CO2 to form Carbohydrates
What molecules are required to convert CO2 into an organic molecule? ATP provides the energy and NADPH provides the hydrogen
What is the Calvin-Benson Cycle? Also known as the light-independent reaction of photosynthesis
Created by: premed
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