Photosynthesis (Lecture 13) Flashcards
Plants are
photoautotrophs
Chlorophyll
the green pigment responsible for capturing light found within chloroplasts
What kind of light does chlorophyll absorb?
light in the blue-violet region and orange-red region
Chloroplast location
mesophyll cells
Where are thylakoids found?
in the stroma (inner liquid of chloroplasts)
Two types of reactions?
light dependent and light independent
Light dependent
energy from the sun is used to split water to produce 2 important energy storage molecules (ATP and NADPH)
What is the byproduct of a light dependent reaction?
Oxygen
Light independent
energy derived from the LDRs is used to produce glucose in the Calvin cycle
Where do light dependent reactions take place?
thylakoid membrane
Photosystem 2 (LD)
Light strikes it, energy is absorbed through chlorophyll.
An electron in chlorophyll gets excited, and then water splits and produces protons, electrons, and oxygen.
Electrons move along the transport chain and lose energy along the way.
Protons accumulate in the thylakoid lumen.
Protons pass through a specialized enzyme (ATP synthase, AKA proton pump).
ATP is then synthesized from ADP and inorganic phosphorus.
Photosystem 1 (LD)
Light strikes
P700 chlorophyll uses light to excite the electron to its primary acceptor
This electron, along with a proton, catalyzes the formation of NADPH from NADP
The final products of light dependent reactions?
Oxygen, ATP, NADPH
