The Phylogenetic Distribution of the Enzyme Rubisco is Limited To

Question

The phylogenetic distribution of the enzyme rubisco is limited to
A) C₃ plants only.
B) C₃ and C₄ plants.
C) all photosynthetic eukaryotes.
D) all known photoautotrophs, both bacterial and eukaryotic.
E) all living cells.

Accepted Answer

Rubisco is a key enzyme used in the Calvin cycle of photosynthesis, and it is found in all known photoautotrophs, both prokaryotic and eukaryotic. Therefore, the phylogenetic distribution of rubisco is not limited to C3 or C4 plants, but includes all photoautotrophs.