light-dependant reactions

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bbot

Cards (13)

what do thylakloids contain?
contains different pigments such as clorophyll which absorbs different wavelengths
what is the rate of photosynthesis limited by?
light intensity, carbondioxide concentration and temperature
where does photosynthesis take place?
in the leaves within chloroplast
where does the light dependant reaction take place?
thylakloid membrane
what are the two products of the light dependant reaction?
ATP and NADPH
what is chemiosmosis?
the movement of H+ ion into the stroma from the thylakloid space from a high concentration to a low concentration passed a partially permeable membrane
how do you maintain the proton gradient?
as the electrons pass through protein complexes via redox reactions ,
energy is produced so energy is supplied for active transport of H+ ions from the stroma to the thylakloid space
what is photophosphorylation?
the process is called photophosphorylation
H+ ions move through ATP synthase (enzyme) into the stroma due to the concentration gradient, this movement is known as chemiosmosis
ADP + Pi →ATP
what is photoionisation?
photoionisation is when light energy is absorbed by the chlorophyll and transferred to electrons which then get excited
the excited electrons are propelled out of the chlorophyll leave the chlorophyll positive and oxidises
describe the electron transfer chain?
the electron which get propelled out travel down a chain of protein complexes via redox reactions
this produces energy which enables the active transport of H+ ions
describe the role of NADP?
NADP is a co-enzyme that helps electrons leave the final protein molecule at the end of the electron transfer chain
NADP reacts with a H+ in the stroma and gains an electron to produce reduced NADP aka NADPH
what is NADP?
a co enzyme
what is photolysis?
the splitting of a water molecule
electrons lost from chlorophyll are restored and more H+ into the thylakloid space
light splits water into H+ , O2 ,e-
takes place in the thylakloid space