The following diagram shows an outline of cellular respiration. Why is the Citric Acid Cycle called a 'cycle,' but the glycolysis and the electron transport chain is not?

MCQS on the biological importance of organic molecules. Topics include bioorganic mechanisms, chirality, lipids, carbohydrates, animo acids, peptides, proteins, nucleic acids, enzymes, coenzymes, and coupled reactions, and lipid, carbohydrate, amino acid, and nucleotide metabolism.