How many carbon molecules does pyruvate has?
Show answer & explanation
Correct answer: A
Explanation
Explanation:
During cellular respiration, the breakdown of glucose leads to the formation of pyruvate. Pyruvate consists of a 3-carbon molecule.
Glycolysis: This process takes place in the cytoplasm, where a 6-carbon glucose molecule (C6H12O6) breaks down into two 3-carbon pyruvate molecules.
Chemical Formula: The chemical formula for pyruvic acid is CH4O3.
Key Points:
Presence of Oxygen (Aerobic): When oxygen is available, pyruvate enters the mitochondria and generates carbon dioxide and energy (ATP).
Absence of Oxygen (Anaerobic): In muscles, when there is a shortage of oxygen, pyruvate converts into lactic acid (which is also a 3-carbon molecule), leading to a sensation of fatigue.
Fermentation: In yeast, in the absence of oxygen, pyruvate breaks down into ethanol (a 2-carbon molecule) and CO2.
Important Questions for Upcoming Examinations:
Question: In which part of the cell does the process of glycolysis take place?
Answer: Cytoplasm.
Question: How many pyruvate molecules are formed from a single glucose molecule during respiration?
Answer: Two.
Question: How many carbon atoms are present in glucose?
Answer: 6 carbon atoms.
Question: What is the number of carbon atoms in ethanol?
Answer: 2 carbon atoms.