Photosynthesis Flashcards

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1
Q

Where does the light dependent stage occur

A

the thylakoid membranes

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2
Q

The basic stages of the light dependent stage

A

1- photolysis of water
2- synthesis of ATP from ADP by photophosphorylation
3- formation of NADPH by the reduction of NADP

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3
Q

Photolysis of water

A

UV light enters PSII and catalyses the photolysis of water, producing 1/2 of an O2 molecule, 2 H+ ions and 2 electrons

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4
Q

Photophosphorylation (until PSII)

A

1- the electrons become excited and are carried along a series of electron carriers, down successively lower energy levels
2- this allows energy to be released and used in synthesis of ATP by photophosphorylation.

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5
Q

Photophosphorylation (PSI and after)

A

1- the electrons enter PSI and are again excited by UV light
2- the excited electrons are carried, along another electron transport chain by carriers at successively lower energy levels, to NADP and reduce it to NADPH, along with the H+ ions produced from photolysis

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6
Q

What does an absorption spectra show

A

The relative absorption of light by different pigments at particular wavelengths

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7
Q

What does an action spectra show

A

The rate of photosynthesis that takes place at different wavelengths of light

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8
Q

The process of light harvesting

A

Light energy is absorbed by a pigment, and causes it to to be excited. Through resonance transfer, the light energy is transferred through the antenna complex until it reaches the reaction centre, where chlorophyll-a is located in large quantities

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