Photosynthesis Flashcards

1
Q

What does ATP provide in the reactions?

A

chemical energy

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2
Q

What does NADPH provide in the reactions?

A

reducing power

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3
Q

Parts of chloroplast important in photosynthesis

A

Stroma

Thylakoid membranes

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4
Q

What light wavelength used in photosystem 1?

A

700nm

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5
Q

What light wavelength used in photosystem 2?

A

680nm

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6
Q

Name the three main electron carriers in the light reaction:

A

Plastoquinone (Q)
Plastocyanin
Ferridoxin

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7
Q

When an electron transporter gains an electron, it has been ______.

A

Reduced

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8
Q

From where to where does plastoquinone transfer electrons?

A

Light reaction

From photosystem 2 to cytochrome bf complex

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9
Q

From where to where does plastocyanin transfer electrons?

A

Light reaction

From cytochrome bf complex to photosystem 2

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10
Q

Where does the light reaction occur?

A

From the stroma, across the thylakoid membrane into the lumen of the thylakoid

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11
Q

Where does the Calvin cycle (light-independent reaction) take place?

A

In the stroma of chloroplasts

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12
Q

What does the cytochrome bf complex do?

A

Pump H+ into lumen when receives electron

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13
Q

What can plastoquinone transfer at one time?

A

2e- and 2H+

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14
Q

What can plastocyanin transfer at one time?

A

1e-

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15
Q

Where is plastocyanin found?

A

The lumen

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16
Q

Where is plastoquinone found?

A

The stroma

17
Q

Where is ferridoxin found?

A

The stroma

18
Q

What does ferridoxin do?

A

Transfer electrons from photosystem 1 to covert NADP+ into NADPH

19
Q

What does the light reaction provide for the dark reaction?

A

NADPH and ATP

20
Q

What are the three parts of the dark reaction (in order)?

A
  1. Fixation
  2. Reduction of PGA to G3P
  3. Regeneration of RuBP from G3P
21
Q

How is calvin cycle regulated?

A

Ferridoxin is regulated
RuBisCo is activated by CO2 (1) and Mg2+ (2)
- Mg2+ moves into stroma as H+ pumped into thylakoids in light reaction

22
Q

What is photorespiration?

A

When RuBisCo attaches O2 (not CO2) to RuBP

23
Q

Why is photorespiration bad?

A

It makes 2-phosphoglycerate instead of 3-phosphoglycerate and takes more reactions and ATP to convert 2-phosphoglycerate into 3-phosphogylcerate