CELL RESPIRATION
GLYCOLYSIS
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
oxygen is not present
|
|
oxygen is present
|
|
when glucose split into two pyruvate molecules
|
|
none of the above
|
Detailed explanation-1: -When oxygen is not present or if an organism is not able to undergo aerobic respiration, pyruvate will undergo a process called fermentation. Fermentation does not require oxygen and is therefore anaerobic. Fermentation will replenish NAD+ from the NADH + H+ produced in glycolysis.
Detailed explanation-2: -Respiration in the absence of oxygen is called anaerobic respiration. It is also termed fermentation. In this process, glucose is partially broken down anaerobically which produces two ATP.
Detailed explanation-3: -Fermentation happens in anaerobic conditions (i.e., without oxygen). Fermentation begins with glycolysis which breaks down glucose into two pyruvate molecules and produces two ATP (net) and two NADH. Fermentation allows glucose to be continuously broken down to make ATP due to the recycling of NADH to NAD+.
Detailed explanation-4: -Aerobic fermentation occurs in the presence of oxygen. It usually occurs at the beginning of the fermentation process. Aerobic fermentation is usually a shorter and more intense process than anaerobic fermentation.