{"id":211643,"date":"2025-05-04T19:22:15","date_gmt":"2025-05-04T19:22:15","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=211643"},"modified":"2025-05-04T19:22:17","modified_gmt":"2025-05-04T19:22:17","slug":"which-of-the-following-metabolic-pathways-is-common-in-aerobic-and-anaerobic-metabolism-2","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/04\/which-of-the-following-metabolic-pathways-is-common-in-aerobic-and-anaerobic-metabolism-2\/","title":{"rendered":"Which of the following metabolic pathways is common in aerobic and anaerobic metabolism"},"content":{"rendered":"\n

Which of the following metabolic pathways is common in aerobic and anaerobic metabolism?<\/p>\n\n\n\n

electron transport chain<\/p>\n\n\n\n

glycolysis<\/p>\n\n\n\n

oxidative phosphorylation<\/p>\n\n\n\n

the citric acid cycle<\/p>\n\n\n\n

The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n

Correct Answer: Glycolysis<\/strong><\/p>\n\n\n\n

Explanation (Approx. 300 words):<\/strong><\/p>\n\n\n\n

Glycolysis is the only metabolic pathway among the options listed that is common to both aerobic<\/strong> (oxygen-present) and anaerobic<\/strong> (oxygen-absent) metabolism. It is the initial step in the breakdown of glucose, occurring in the cytoplasm<\/strong> of all cells, and does not require oxygen to proceed.<\/p>\n\n\n\n

During glycolysis, one molecule of glucose (a 6-carbon sugar) is converted into two molecules of pyruvate<\/strong> (a 3-carbon compound). This process yields a net gain of 2 ATP molecules<\/strong> (adenosine triphosphate) and 2 NADH molecules<\/strong> per glucose molecule. Because glycolysis does not depend on oxygen, it is fundamental to energy production in both aerobic and anaerobic organisms.<\/p>\n\n\n\n

In aerobic conditions<\/strong>, the pyruvate produced in glycolysis enters the mitochondria<\/strong> and is further oxidized in the citric acid cycle (Krebs cycle)<\/strong> and the electron transport chain<\/strong>, leading to significantly more ATP production via oxidative phosphorylation<\/strong>.<\/p>\n\n\n\n

In contrast, under anaerobic conditions<\/strong>, cells cannot rely on oxygen-dependent processes. Therefore, the pyruvate generated from glycolysis is converted into lactic acid<\/strong> (in animals) or ethanol and CO\u2082<\/strong> (in yeast), depending on the organism. These fermentation processes regenerate NAD\u207a<\/strong>, which is essential to keep glycolysis running in the absence of oxygen.<\/p>\n\n\n\n

Let\u2019s briefly examine why the other options are not<\/em> common to both metabolic states:<\/p>\n\n\n\n