photosynthesis Flashcards
where does the light dependent reaction occur
thylakoid membrane
where does the light independent reaction take place
stroma
what si the purpose of the light dependent reaction
- to phosphorylate ADP to ATP
- photolysis
define a metabolic pathway
a series of small reactions controlled by enzymes
define phosphorylation
adding phosphate to a molecule
define photophosphorylation
addition of phosphate using light
define photolysis
splitting of a molecule using light
define decarboxylation
the removal of carbon dioxide from a molecule
what is a coenzyme
a molecule that aids the function of an enzyme
what si the wavelength of PS1
700nm
what is the wavelength of PS2
680nm
which is hit first PSI OR PSII
PSII
describe the light dependent reaction
light is absorbed in PSII. the chlorophyll will become photoionized. an electron will be excited, they will move to a higher energy level and then enter an electron carrier
to PSI where energy will be decreased. photolysis will occur, water will split to give back an electron to PSII chemiosmosis will occur. light will be absorbed by PSI which will excite electrons to an even higher level. NADP will be reduced by gaining H+ AND an electron from PSI to form NADPH
what are the adaptation of the site of the light dependent reaction
the thylakoid membrane provides a large surface area.
- granal membrane have ATP synthase which catalyses the production of ATP ( they are also selectively permeable which allows the h+ gradient to be established)
- chloroplasts have their own DNA and ribosomes they can easily manufacture some of the proteins involved in the LDR
what is another name for the light independent reaction
Calvin cycle
