Photosynthesis Flashcards

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1
Q

Where do light reactions take place and what do they produce?

A
  • they produce ATP and NADPH

- and it is in thylakoid membranes

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2
Q

What is NAD used for?

A

It is used to accelerate oxidation of sugars, [NAD] is kept high

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3
Q

What is NADHPH used for?

A
  • it is used for reductions to make sugars

- [NADPH] is kept high

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4
Q

How does energy absorption work?

A
  • it is electron transition to a higher energy level, which can facilitate chemical reactions. Low energy, high wavelength. vice versa.
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5
Q

What results in delocalized electrons?

A
  • alternating/conjugated double bonds found in chlorophyll or beta carotene results in delocalized electrons - excited by certain wavelength of visible light
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6
Q

What are 3 things that may happen with excited electrons?

A

1) might fall back to ground state releasing light of slightly longer wavelength and heats
2) resonance energy transfer - physical process, energy released when a chlorophyll electron falls back to ground state, it is used to exite neighbouring chlorophyl molecule of slightly longer wavelength
3) transfer electrons - redox

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7
Q

In photosynthesis - which steps are redox and which are not?

A
  • all initial steps from absorption of a photo until central chlorophyll is excited transfer of energy
  • last step, electron transferred, redox reaction
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8
Q

What is the strongest oxidizing agent in biology?

A
  • chlorophyll lacking an electron
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9
Q

What is the process of photosystem II and I?

A
  • electrons released by photosystem II, move down electron transport chain and end up in photosystem I, where chlorophyll is excited and transferred to second electron transfer chain, which generates NADPH
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10
Q

Cyclic electron transport

A
  • no water split
  • no oxygen released
  • PS I on its own
  • plants use this when they have made enough sugar
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11
Q

Carbon fixation in stroma of chloroplasts

A
  • describes conversion of C02 gas to sugar

- used up all of ATP and reducing power which is made in noncyclic electron transport

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12
Q

What is the difference between NAD and NADP?

A
  • same properties, occurs in plants and animals, made by separate pathways and independently regulated
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