CELL RESPIRATION
GLYCOLYSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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one ATP molecule must be added to glucose
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two phosphate groups must be attached to glucose
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three ATP molecules must be added to glucose
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one ATP molecule must be taken away from glucose
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Detailed explanation-1: -Glycolysis is the first step in the breakdown of glucose to extract energy for cellular metabolism. Nearly all living organisms carry out glycolysis as part of their metabolism. The process does not use oxygen and is therefore anaerobic (processes that use oxygen are called aerobic).
Detailed explanation-2: -Answer and Explanation: Before a glucose molecule can be broken down to release energy, (E) two phosphate groups must be attached to glucose. During glycolysis, two ATPs are first used to make fructose-1, 6-bisphosphate.
Detailed explanation-3: -In the first step, glucose ⇢ glucose-6-phosphate, ATP is used and gets converted into ADP. Similarly, in the third step, fructose-6-phosphate ⇢ fructose-1, 6-biphosphate, ATP is used. Thus, two ATPs are used in the first three steps of glycolysis. Hence, to split the glucose 2 molecules of ATPs are used.
Detailed explanation-4: -Glycolysis produces 4 ATP molecules. However, 2 ATP molecules are required to initiate glycolysis. Subtracting these two numbers gives the net ATP yield from glycolysis–2 ATP molecules.