Question

In what does glucose breakdown in the first step of respiration in cytoplasm? (a) lactic acid (b) carbon dioxide (c) Starch (d) Pyruvate ​

Answer 1

• In stage one, glucose is broken down in the cytoplasm of the cell in a process called glycolysis.
• In stage two, the pyruvate molecules are transported into the mitochondria.

Answer 2

Glucose breakdown in pyruvate is the first step of respiration in the cytoplasm.

• Respiration is a metabolic process in which a cell generates energy in form of ATP from the breakdown of glucose.
• The breakdown of glucose occurs through glycolysis, the citric acid cycle, and the electron transport chain (ETC).

• The process of conversion or breakdown of glucose into pyruvate is called glycolysis.
• Glycolysis occurs in the cell cytoplasm and it is the first step of respiration.
• It is an anaerobic metabolic process that occurs in the absence of oxygen.
• Glycolysis is a ten-step biochemical process, mediated by various enzymes which catalyze the conversion of  6-carbon compound glucose (by using 2 ATPs) into the 3-carbon compound, pyruvate.
• In this process, 4 ATPs are synthesized and 2 ATPs are used.
• Pyruvate further goes under two pathways i.e. aerobic respiration and anaerobic respiration.
• In anaerobic respiration, pyruvate can be converted into lactic acid as well as alcohol.
• In aerobic respiration, it is converted into CO₂ and water.