All enzymes of (TCA) cycle are located in the mitochondrial... | Biology | SolveeIt | Solveeit

Today, August 23

Question

All enzymes of $TCA$ cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is

A

Malate dehydrogenase

B

Isociatrate dehydrogenase

C

Succinate dehydrogenase

D

Lactate dehydrogenase

Answer

Succinate dehydrogenase

Explanation

Solution

Mitochondrion is the organelle which bears various enzymes participating in Krebs' cycle. Each mitochondrion is covered by double membrane. The inner membrane is selectively permeable and forms foldings called cristae. The inner membrane bears oxysomes, enzymes of fatty acids, succinate dehydrogenase (of Kreb's cycle) and electron transport system. All other enzymes of Krebs' cycle are present in the mitochondrial matrix.