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Flashcards in Photosynthesis Deck (17):
0

Photosynthesis uses the sun's energy to make??

Carbohydrates

1

Photosynthesis reaction

6CO2 + 6H2O -> C6H12O6 + 6O2

-exact reverse of respiration
-reduces carbon dioxide and oxidizes water into oxygen
*we take up oxygen... But plants are opposite and produce oxygen

2

Photosynthesis can be broken down into:

1. Light reactions (happen first) require light
2. Dark reactions- dont only happen in the dark, but they dont require light

3

Light reactions

-Use sunlight
-oxidize water into O2
-this makes alot of ATP and NADPH
* goal is to make alot of energy in the form of ATP and NADPH

4

Dark reactions

-takes CO2 out of the air and uses it to make carbohydrates
-costs alot of energy (uses the ATP and NADPH)

5

Where does photosynthesis take place

-in the chloroplasts of plants
(Thylakoid lumen and membrane)

6

Chloroplast structure

-have multiple membranes
-have an inner and outer membrane
-had a thylakoid membrane containing grana
*three membranes
----photosynthesis takes place in the thylakoid lumen and membrane

7

How many times is light involved in photosynthesis?

-twice
-once in photosystem 2 and once in photosystem 1

8

Light reactions system

-PS2 absorbs light best at 680
-PS1 absorbs light best at 700
-passes the excited electrons from
1. photosystem 2 to
2. plastoquinone(a carrier) which passes them onto
3. cytochromr b6f complex who passes them off to
4. plastocyanine who passes them off to
5. photosystem 1 which requires light and passes them to
6. Faradoxin that passes them to a
7 FMR complex which uses those electrons to make NADPH

***take place in the thylakoid lumen

9

Which photosystem is involved first?

PS2 then PS1

10

Where is water converted into O2?

At PS2

11

Final electron carrier

NADPH

12

[H+] concentration

High on the lumen side (lower PH)
Low on stroma side (higher PH)

This is used to produce ATP

13

Dark reactions system

1. Turn CO2 into GA3P (3 carbons) so it needs 3 CO2 molecules
---costs 9ATP and 6NADPH very expensive
-the GA3P is used to make carbohydrates

14

What is the calvin cycle?

Another name for the dark reactions

15

RuBisc

The enzyme that starts the dark reactions
-one of the most abundant protein/enzyme on the planet

16

Carbon fixation

3CO2 + H2O -> GA3P

-uses alot of ATP and NADPH from the light reaction