photosynthesis Flashcards
Photosynthesis
Conversion of light energy from the sun into chemical energy.
light reactions
the light driven production of ATP
Carbon fixation
the conversion of CO2 to carbohydrates
Chloroplast
An organelle found in plant and algae cells where photosynthesis occurs
structure of chloroplast
outer membrane, inter membrane space, inner membrane, stroma, thykaloid, granum (stack of thykaloid), thylakoid membrane, thylakoid lumen.
How are energy and wavelength related
inversely
What colour of light is usually absorbed by plants
blues and reds
chlorophyll a
absorbs blue-violet and red light and reflects green
Chlorophyll b
extends the absorption spectrum and acts as an accessory pigment that also participates in light absorption
Carotenoids
Accessory pigments that broaden the spectrum of colors that can drive photosynthesis.
Photosystem 1 (PS1)
One of two light-capturing units in a chloroplast’s thylakoid membrane or in the membrane of some prokaryotes; it has two molecules of P700 chlorophyll a at its reaction center.
antenna complex
Part of a photosystem, containing an array of chlorophyll molecules and accessory pigments, that receives energy from light and directs the energy to a central reaction center during photosynthesis.
Photosystem 2
(Functions 1st) Reaction Center is P680(red), a light reaction in which ATP and NADPH are formed
Electron transport chain photosynthesis
Electrons move through several transmembrane proteins that are responsible for pumping H+ ions across the membrane creating the chemical gradient across the chloroplast membrane. Energy source is captured light. Part of the light reactions.
noncyclic pathway
Light-dependent photosynthetic pathway that is used to generate ATP and NADPH; because the pathway is noncyclic, the electrons must be replaced by the splitting of water (photolysis).