Lecture 11 Flashcards

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1
Q

How is chlorophyll capable of absorbing photons?

A

The porphyrin ring possess a magnesium ion and an alternating single and double bonds. The system of double bond (resonance) is able to channel the energy absorbed.

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2
Q

Where does photosynthesis occurs?

A

In the photosystems present in the thylakoid membrane

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3
Q

What does photosystem contains?

A

chlorophyll-a, associated pigments and accessory proteins required to carry out photosynthesis

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4
Q

Photosystems are made of…

A

antenna complex and reaction centres

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5
Q

What is the role of the antenna complex?

A

capture and transfer the energy from light to the reaction centre

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6
Q

Where do the light dependent reactions occur?

A

In the thylakoid and the thylakoid membrane

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7
Q

What is the first step?

A

Primary photoevent: pigments are excited by a photon

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8
Q

What is the second step?

A

Charge separation: energy is transferred to the reaction centre, where an electron is transferred to an electron acceptor

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9
Q

What is the third step?

A

Electron transport: electron transport chain = create proton gradient and use to reduce the final electron acceptor NADPH

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10
Q

What is the complete reaction?

A

Photosystem 2&raquo_space; quinone&raquo_space; plastoquinone&raquo_space; b6-f complex&raquo_space; plastocyanin&raquo_space; photosystem 1&raquo_space; quinone&raquo_space; ferredoxin (NADP&raquo_space; NADPH)

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11
Q

What donates an electron to the quinone?

A

manganese ion

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12
Q

How many photons it requires to complete the oxidation of 2 molecules to produce molecular oxygen (2 electrons per water)

A

4

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13
Q

What is b6-f complex?

A

a proton pump and it uses the energy from the electrons to pump H+ into the thylakoid lumen

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14
Q

What is ferroredoxin?

A

it donates the electrons to NADP+ creating NADPH via the enzyme NADP reductase

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15
Q

Where is found NADP reductase?

A

In the stromal side of the thylakoid membrane

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