Photosynthesis Flashcards
Outline the main features of non-cyclic photophosphorylation.
Involves both photosystem I and II.
Photolysis of water occurs.
Oxygen is produced.
NADP is final electron acceptor.
Photosystem I accepts electrons from photosystem II.
Chemiosmosis occur to produce ATP.
Describe the functions of internal membranes of the chloroplast in photosynthesis.
Contains photosynthetic pigments to absorb light energy.
Allow electrons to move along electron transport chain in non-cyclic photophosphorylation.
Site of photolysis of water.
Site where chemiosmosis occurs.
Contains ATP synthase to make ATP.
Thylakoids stack to form grana to give large surface area.
Explain why thylakoid membrane has many different coloured pigments to function efficiently.
Increase range of wavelengths of light that can be absorbed.
Increase rate of light dependent reaction.
Chlorophyll a absorbs red and blue light, whereas xantophyll absorbs blue-green light.
Describe how to carry out chromatography to separate and identify the coloured pigments in a liquid extract.
Place extract on line or origin.
Repeat the process to concentrate the extract.
End of paper is placed in propanone.
Mark the solvent front after paper is removed.
Rf value is distance moved by solute divided by distance moved by solvent.
Compare with known Rf values to identify pigments.
Describe the role of other photosynthetic pigments found in chloroplasts besides chlorophyll a.
Act as accessory pigment.
Absorb different wavelengths of light.
Pass energy to reaction centre / chlorophyll a.
For example, xantophyll absorbs blue-green light.
