PHOTOSYNTHESIS -Light Dependent Reaction:A-level Biology. Photolysis, photoionisation & chemiosmosis

Photosynthesis is a two-stage reaction: the light-dependent reaction (LDR) and light-independent reaction (LIR). LDR is the first stage of photosynthesis and it requires light. Light energy and water are used to create ATP and reduced NADP which are needed for the light-independent stage.
This occurs in four key stages:
Photoionisation of chlorophyll
Production of ATP and reduced NADP
Chemiosmosis
Photolysis
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[@milenakrol327]

omg this finally makes sense tysm 🙏

[@MissEstruchBiology]

yay 😁😁😁 so pleased

[@PedroPony833]

Ur actually a lifesaver

[@MissEstruchBiology]

aww so happy it helped

[@sophiedresner8787]

so helpful thank you!

[@MissEstruchBiology]

You're welcome!

[@maahip2060]

hi miss, what do the electrons in photolysis actually get used for if it is the electrons in photoionisation which are used in the electron transfer chain?

[@MissEstruchBiology]

they replace the electrons lost from photoionsation so the ETC can continue

[@tajrafoy3472]

Would electrons from the splitting of water not be used in PSII and passed down the electron chain a well?

[@MissEstruchBiology]

yeah, they replace the elections lost from PSII

[@sss-sl3nu]

the electron carrier protein is the same as the protein embedded in thylakoid membrane right?

[@MissEstruchBiology]

yeah 😊

[@shadowrift8430]

Cheers

[@MissEstruchBiology]

Glad it helped!

[@niro405]

Is this the same syllabus teaching in Sri Lanka?

[@davidbiju4810]

Whats the difference between this video and the other ldr video

[@Laufeycalled]

this one’s light dependent the other is light independent

[@davidbiju4810]

@@Laufeycalled no there are 2 light dependent videos that are the exact same

[@MissEstruchBiology]

This one is updated based on feedback in the comments that some parts were confusing. So re explained in a different way 😁

[@nicolaoneill955]

is this AQA? are all your videos AQA?

[@MissEstruchBiology]

AQA. Mine are all AQa unless is is labelled otherwise