Chapter 11 - Photosynthesis Flashcards
(LDR) What is produced in the light dependent stage of photosynthesis?
- Reduced NADPH
- ATP
- 1/2 Oxygen molecule
- 2 Hydrogens
(LDR) Where does the energy come from in the light dependent reaction?
From light absorbed in the chloroplasts from the sun
(LDR) How do the electrons move throughout the chain?
- Redox reactions through electron carriers
(LDR) Where do the electrons in the light dependent chain come from?
Photolysis of water in the thylakoid space, electrons move into the chloroplast
(LDR) What does the photolysis of water produce?
Produces :
- 2 hydrogen ions
- 2 electrons
- 1/2 oxygen molecules
(LDR) What happens when the electrons reach the hydrogen pump?
Allows hydrogen ions to move through the hydrogen pump, from the stroma (low concentration of hydrogen ions) to the thylakoid space (high concentration of hydrogen ions)
(LDR) What are the chloroplasts also known as?
Photosystem 2 / chloroplast 2
Photosystem 1 / chloroplast 1
(LDR) What happens at the second chloroplast?
The electrons gain more energy to allow them to move up the chloroplast and continue across the bilayer
(LDR) What is NADP+?
It is a coenzyme (something that helps an enzyme work
(LDR) What happens to the electrons at the end of the light dependent chain?
They join onto NADP+ with hydrogen ions from the ATP SYNTHASE to create reduced NADPH
(LDR) What happens to the hydrogen ions from the hydrogen pump and photolysis of water?
They are moved through ATP SYNTHASE, causing ADP and Pi to join together creating ATP
(LDR) What theory is the creation of ATP through ATP SYNTHASE?
Chemiosmotic theory
(LDR) What are the ATP and reduced NADPH used for?
The light independent reaction
(LDR) Where does the light dependent reaction happen?
In the thylakoid membrane of a thylakoid
What are the adaptions of the chloroplast for the light dependent reaction?
- Thylakoid membrane have a large SA due to flattened shape
- General membrane contains ATP synthase
- Arrangement of proteins in grana hold chlorophyll in precise way to maximise absorbtion of light
- Contain DNA and ribosomes to produce proteins required
What is the NADP+ also known as?
The final electron acceptor
