Microbial Autotrophic CO2 Fixation

Question 1

Heterotroph

Answer 1

Organism that uses an ORGANIC carbon source

Question 2

Autotroph

Answer 2

Organism that uses an INORGANIC carbon source

Question 3

Auxotroph

Answer 3

Organism that requires external growth factors

Question 4

Autotrophic CO2 fixation pathway

Answer 4

Converts CO2 into a central carbon intermediate

Question 5

How does a cyclic autotrophic CO2 fixation pathway work?

Answer 5

Primary acceptor(s) (organic molecules) are carboxylated with CO2 to form a central carbon intermediate

Question 6

How does a linear CO2 fixation pathway work?

Answer 6

CO2 + electrons = central carbon metabolism

Question 7

What are the important bits from the Calvin cycle?

Answer 7

Phosphoribulokinase turns ribulose-5-phosphate into the

Primary acceptor - ribulose-1,5-bisphosphate

RubisCO turns the primary acceptor into 3-phosphoglycerate

Central carbon intermediate - 3-phosphoglycerate