EVERYDAY SCIENCE

Detailed explanation-1: -The tricarboxylic acid (TCA) cycle, also known as the Krebs or citric acid cycle, is the main source of energy for cells and an important part of aerobic respiration. The cycle harnesses the available chemical energy of acetyl coenzyme A (acetyl CoA) into the reducing power of nicotinamide adenine dinucleotide (NADH).

Detailed explanation-2: -Krebs cycle or TCA cycle takes place in the matrix of mitochondria under aerobic condition. Step 1: The first step is the condensation of acetyl CoA with 4-carbon compound oxaloacetate to form 6C citrate, coenzyme A is released. The reaction is catalysed by citrate synthase.

Detailed explanation-3: -The Krebs cycle (Citric acid or Tricarboxylic acid cycle) is the second phase of aerobic respiration. The Pyruvic acid produced during Glycolysis enters the mitochondria and immediately converts to Acetyl Coenzyme A. Mitochondria are the cell’s powerhouses that produce energy.

Detailed explanation-4: -The citric acid cycle in eukaryotes takes place in the mitochondria while in prokaryotes, it takes place in the cytoplasm. The pyruvate formed in the cytoplasm (from glycolysis) is brought into the mitochondria where further reactions take place.

Detailed explanation-5: -The Krebs cycle is the main source of energy for cells and is a crucial part of aerobic respiration. It consumes pyruvate to produce carbon dioxide, ATP, NADH, and FADH. The first product formed in the cycle is citric acid. Thus it is also known as the citric acid cycle.