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11.2 light-dependent reactions

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Total cards: 7•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

what 2 products are light-dependent reactions?

Back (Answer)

• ATP • O2

#2
Front (Question)

how is ATP made in the light-dependent reaction? (4)

Back (Answer)

1) - 2e- becomes excited by light & is passed on e- carriers (in thylakoid membranes) - photoionisation (chlorophyll is ionised & oxidised & e- carrier is reduced) 2) - e- passed on by oxidation-reduction reactions & loses energy at each level to e- carriers 3) - H+ ions are pumped by hydrogen pumps (with gained energy to 2e-) 4) H+ could only leave the thylakoid (down conc. gradient) by ATP synthase which synthesises ADP + Pi -> ATP

#3
Front (Question)

what is photoionisation?

Back (Answer)

1- chlorophyll absorbs light 2- electrons are lost / chlorophyll becomes positively charged

#4
Front (Question)

how is NADP reduced?

Back (Answer)

H+ that passed through ATP synthases are taken up by NADP+ & 2e- from (1 & 2) -> reduced NADP

#5
Front (Question)

how is photolysis of water carried out?

Back (Answer)

H2O molecules are split by light: 2 H2O -> 4H+ + 4e- + O2

#6
Front (Question)

which product of water photolysis is used to reduce chlorophyll?

Back (Answer)

e-

#7
Front (Question)

what are the 4 structural adaptations in the chloroplast?

Back (Answer)

1) impermeable - H+ gradient used by ATP synthase 2) chlorophyll - network of proteins hold it precisely to maximise light absorption 3) DNA & ribosomes - quickly make proteins 4) thylakoid membrane - large SA for attaching chlorophyll, e- carriers & enzymes