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Plant-Environment Interactions > Photosynthesis > Flashcards

Flashcards in Photosynthesis Deck (23):
1

What does ATP provide in the reactions?

chemical energy

2

What does NADPH provide in the reactions?

reducing power

3

Parts of chloroplast important in photosynthesis

Stroma
Thylakoid membranes

4

What light wavelength used in photosystem 1?

700nm

5

What light wavelength used in photosystem 2?

680nm

6

Name the three main electron carriers in the light reaction:

Plastoquinone (Q)
Plastocyanin
Ferridoxin

7

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

Reduced

8

From where to where does plastoquinone transfer electrons?

Light reaction
From photosystem 2 to cytochrome bf complex

9

From where to where does plastocyanin transfer electrons?

Light reaction
From cytochrome bf complex to photosystem 2

10

Where does the light reaction occur?

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

11

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

In the stroma of chloroplasts

12

What does the cytochrome bf complex do?

Pump H+ into lumen when receives electron

13

What can plastoquinone transfer at one time?

2e- and 2H+

14

What can plastocyanin transfer at one time?

1e-

15

Where is plastocyanin found?

The lumen

16

Where is plastoquinone found?

The stroma

17

Where is ferridoxin found?

The stroma

18

What does ferridoxin do?

Transfer electrons from photosystem 1 to covert NADP+ into NADPH

19

What does the light reaction provide for the dark reaction?

NADPH and ATP

20

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

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

21

How is calvin cycle regulated?

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

What is photorespiration?

When RuBisCo attaches O2 (not CO2) to RuBP

23

Why is photorespiration bad?

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