InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Q.20Explain the mechanism of C4 pathway. |
|
Answer» The C4 pathway initiates with a molecule called phosphoenolpyruvate (PEP) which is a 3-carbon molecule. This is the primary CO2 acceptor and the carboxylation takes place with the help of an enzyme called PEP carboxylase . They yield a 4-C molecule called oxaloacetic acid (OAA). Eventually, it is converted into another 4-carbon compound known as malic acid. Later they are transferred from mesophyll cells to bundle sheath cells. Here OAA is broken down to yield carbon dioxide and a 3-C molecule. The CO2 thus formed is utilized in Calvin cycle whereas 3-C molecule is transferred back to mesophyll cells for regeneration of PEP.Corn,sugarcane and some shrubs are example of plants that follows C4 pathway |
|