What is the net gain of $ATP$ molecules produced by glycolysis in anaerobic respiration?

Glycolysis is $................$

Glycolysis:
$I$. Causes partial oxidation of glucose (one molecule) to form $2$ molecules of pyruvic acid and $2$ $ATP$ as net gain.
$II$. Takes place in all living cells.
$III$. Uses $2$ $ATP$ at two steps.
$IV$. Scheme was given by Gustav Embden,Otto Meyerhof,and $J$. Parnas.
Choose the correct option containing appropriate statements from the above.

During glycolysis,the enzyme hexokinase converts glucose to glucose-$6$-phosphate. The activity of hexokinase is inhibited by glucose-$6$-phosphate through which of the following mechanisms?

Which of the given enzymes of glycolysis is required at the beginning of the process?

During glycolysis,which molecule acts as the electron acceptor during the oxidation of glyceraldehyde$-3-$phosphate?