Question

TCA enzymes mostly occur in

• A. Ribosomes
• B. Mitochondrial matrix
• C. Cytoplasm
• D. Peroxisome

Answer 1

The correct option is B Mitochondrial matrix

• The mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell which is present in all eukaryotic cells.
  
• The inner membrane of the mitochondria is the site of the electron transport chain (aerobic respiration) therefore, consists of respiratory chain enzymes.
  

• The enzymes for the citric acid cycle or Kreb's cycle are located in the mitochondrial matrix (expect for succinate dehydrogenase).
  
• So, the correct answer is 'Mitochondrial matrix'.