LEC. 3 - Metabolic Diversity - Phototrophy

Question 1

In photosynthesis, which 2 molecules are used to fix CO2

Answer 1

ATP and NADH

Question 2

What is the name of the organism that can fix CO2?

Answer 2

autotrophic

Question 3

What is a photoheterotrophic organism?

Answer 3

uses light for energy but cannot fix CO2

Question 4

What do photoheterotrophic organisms use as their source?

Answer 4

organic carbon

Question 5

Photoautotrophic organism uses what as their carbon source?

Answer 5

CO2
(inorganic)

Question 6

What are the 5 photosynthetic pigments that photosynthesis needs?

Answer 6

1. Chlorophylls
2. Bacteriochlorophylls
3. “Helper” Proteins
4. Phycobiliproteins
5. Carotenoids

Question 7

Which 2 photosynthetic pigments make up antennae pigments?

Answer 7

1. phycobiliproteins
2. caretenoids

Question 8

Antennae pigments are found in?

Answer 8

1. cyanobacteria
2. purple sulfur bacteria

Question 9

For purple sulfur bacteria, what is the electron donor?

Answer 9

H2S

Question 10

What kind of reaction centres do purple sulfur bacteria have?

Answer 10

quinone based

Question 11

For purple sulfur bacteria, they run?

Answer 11

reverse electron flow

Question 12

In the light-harvesting structure of purple sulfur bacteria, what is the photosynthetic membrane called?

Answer 12

lamellae/stacks

Question 13

In the light-harvesting structure of purple sulfur bacteria, what are the helper pigments called and where are they located?

Answer 13

antennae pigments embedded within stacks

Question 14

In the light-harvesting structure of green sulfur bacteria, where are the helper pigments organized in?

Answer 14

chlorosomes

Question 15

For green bacteria, what are the names of the sensory structures that it uses?

Answer 15

chlorosomes

Question 16

For green bacteria, what serves as the photoprotective agents that absorb harmful light?

Answer 16

carotenoids

Question 17

What is the habitat of oscillatoria limnetica?

Answer 17

anoxic salt ponds

Question 18

What was the first form of photosynthesis on Earth?

Answer 18

anoxygenic

Question 19

What was the key evolutionary invention of cyanobacteria?

Answer 19

1. join PS1 and PS2
2. evolve H2O as an electron donor