Photosynthesis Flashcards

1
Q

Photosynthesis

A

Energy for all life on Earth ultimately comes from sunlight captured by photosynthesis
One of most significant metabolic processes on Earth

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2
Q

Photosynthesis equation

A

6CO2 + 12H2O + light energy=C6H12O6 + 6H2O + 6O2

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3
Q

Oxygenic photosynthesis is carried out by

A

Cyanobacteria
7 groups of algae
All land plants (have chloroplasts)

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4
Q

Anoxygenic photosynthesis does not produce O2 and is carried out by:

A

At least 5 different groups of BacteriaAnoxygenic phototrophy is better term especially if energy gained from light is not used to fix CO2

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5
Q

Light-dependent” reactions where

A

Thylakoid membrane of the chloroplast

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6
Q

Light dependent reactions are called what

A

Photosynthetic electron-transfer reactions

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7
Q

“Light-independent” reactions.. were

A

stroma called carbon fixation

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8
Q

“Light-independent” reactions are called what

A

Carbon-fixation reactions in stroma

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9
Q

What do light DEPENDENT reactions do?

A

Capture energy from sunlight in Pigments
Use light energy to make ATP
reduce NADP+ to NADPH in thylakoid

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10
Q

Light Independent reactions do>

A

Use ATP and NADPH to power synthesis of organic molecules (monosaccharides) from CO2
in stroma

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11
Q

Where are pigments found

A

thylakoid membrane

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12
Q

2 types of pigments

A

Chlorophyll

Carotenoids (accessory)

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13
Q

Chlorophyll

A

a (main) and b (accessory)

Similar structure, different absorption spectra

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14
Q

Carotenoids (accessory)

A

Carotenes and xanthophylls

Example: b-carotene

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15
Q

Pigments

A

alternating single and double bonds (i.e., way to transfer electrons/energy)

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16
Q

2H2O oxidized =

A

produces O2 + 4H+ + 4e-

17
Q

Chlorophyll loses electron

A

(oxidized);

18
Q

chlorophyll gains electron

19
Q

Photosystem organization

A

Light harvesting complex

20
Q

Light harvesting complex

A
Capture photons (sunlight energy)
Excitation energy (not e-!) transferred from one pigment to another until reaches reaction center
21
Q

Reaction center

A

Contains chlorophyll special pair

22
Q

Reaction center Contains

A

chlorophyll special pair

23
Q

Chlorophyll special pair traps photon energy

A

passes excited electron to an acceptor

24
Q

Electron donor restores electron to chlorophyll special pair

A

Donor = water

Oxidation of water = release of O2

25
4 steps of light dependent reaction
Primary photoevent & H2O oxidized Charge separation Electron transport Chemiosmosis (ATP production)
26
``` First step of light dependent reaction photosystem II (comes before photosystem I) ```
``` Primary photoevent (Light energy (photons) absorbed) H2O oxidized (replenishes lost electrons to reaction center; releases O2) ```
27
second step of light dependent reaction
Charge separation (e- released to electron transport chain)
28
third step of light dependent reaction | photosystem I
``` Electron transport (e- reduce NADP+ to NADPH) H+ pumped from stroma into thylakoid space ```
29
fourth step in light dependent reaction
Chemiosmosis (ATP production) | H+ leave thylakoid space (via ATP synthase) to stroma
30
What steps occur in the thylakoid space
Steps 1-3
31
How are the electrons replaced in photosystem I
Produced in photosystem II that occurs before it
32
What produces ATP in the final step of light dependent reaction
ATP synthase using proton gradient
33
How are the electrons replaced in photosystem II
By oxidation of water the O2