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Bioc 405 > Photosynthesis > Flashcards

Photosynthesis Flashcards

1
Q

Where do the light reactions occur?

A

Thylakoid membrane

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2
Q

Where do the dark reactions occur?

A

The stroma

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3
Q

Where are protons pumped out of and into to?

A

Pumped out of the stroma and into the thylakoid lumen

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4
Q

What is analogous to cytochrome c in the light reactions?

A

plastocyanin

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5
Q

What is analogous to Q in the light reactions?

A

plastoquinone

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6
Q

What is a byproduct of the light reactions?

A

oxygen (that we breathe!)

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7
Q

What molecule are electrons in the light rxns extracted from?

A

H20

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8
Q

What is at the center of the D1 and D2 catalytic subunits of PSII?

A

The special pair of chlorophylls (P680)

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9
Q

What surrounds the special pair?

A

The light harvesting complexes

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10
Q

What is a key element that chlorophylls contain?

A

Magnesium

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11
Q

Why are there so many pigment molecules?

A

Diff types of pigment absorb diff wavelengths, thus ensuring we absorb most energy of the sun

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12
Q

True or False - it takes about 10-100 picoseconds from the time an antenna pigment absorbs a photon to when the energy excites P680

A

True

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13
Q

How are the photons transferred from the antenna pigments to P680?

A

Resonance transfer

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14
Q

What primary electron acceptor is waiting to grab an electron from P680?

A

Pheophytin

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15
Q

When e- deficient, P680+ is biology’s strongest ____ ____.

A

oxidizing agent

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16
Q

What is one element found in the oxygen evolving complex?

A

There are 3: Manganese, Calcium, and Oxygen

17
Q

P680+ is a strong ____, while P700* is a strong ____.

A

oxidant, reductant

18
Q

True of False - in the cyclic pathway, Ferredoxin takes electrons back to Cytochrome b6f (when NADPH is abundant) where they can be used by Q cycling to produce ATP

A

True

19
Q

True or False - The light reactions do not consist of an ATP synthase structure.

A

False

20
Q

Ferredoxin works with __ to reduce NADP+ to NADPH

A

FNR

21
Q

True of False. FNR accepts electrons one at a time from the FeS cluster in Ferredoxin to transfer to the NADP+ domain.

A

True

22
Q

When NADP+ is low, what does the cell have plenty of?

A

NADPH

23
Q

How many water molecules are needed to form O2?

A

2

24
Q

What does P680 get its electrons from?

A

a nearby tyrosine in D1

25
Q

How many e- must be pulled out of water to form oxygen?

A

4 electrons

26
Q

How many NADPHs are produced in the light rxns?

A

2 NADPHs

Bioc 405 (15 decks)

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