Teaching MPPSC Assistant Professor Mock Test Series 2025 Life Sciences System Physiology Plant Secondary metabolites
Two pathways contribute to the biosynthesis of isopentenyl diphosphate (IPP), the activated five-carbon building block of terpenes. Which of the following correctly describes these pathways and their intermediates?
1
The mevalonic acid pathway involves the condensation of three acetyl-CoA molecules to form mevalonic acid, which is then converted to IPP.
2
The MEP pathway, operational in mitochondria, utilizes intermediates from the citric acid cycle to synthesize IPP directly.
3
In the mevalonic acid pathway, IPP is synthesized from glycolytic intermediates without the formation of mevalonic acid.
4
The MEP pathway relies solely on mevalonic acid derived from the degradation of fatty acids for IPP synthesis.