Question

Number of ATP molecules synthesised through Substrate level phosphorylation during aerobic respiration of one glucose molecule is

• A. 8
• B. 6
• C. 4
• D. 2

Answer 1

The correct option is B 6

Substrate-level phosphorylation is a metabolic reaction that results in the formation of ATP or GTP by the direct transfer of a phosphoryl (PO₃) group to ADP or GDP from another phosphorylated compound.
Three substrate level phosphorylations occurs during aerobic respiration.
During glycolysis, two substrate-level phosphorylation results in the production of 4 ATP's.
Where as one phosphorylation reaction occurs in Krebs’s cycle yielding 2 ATP's.
Therefore in total 6 ATP's are obtaiend from substrate-level phosphorylation​​​​ during aerobic respiration of a glucose​​ molecule​.