What is the net gain of $ATP$ when each molecule of glucose is converted to two molecules of pyruvic acid?

Choose the correct option:
$(1)$ Glucose and fructose are phosphorylated by the enzyme transferase/hexokinase to form glucose $6$-phosphate.
$(2)$ In fermentation,yeast converts glucose into ethanol under aerobic/anaerobic conditions.

During respiration,pyruvic acid is formed by

Assertion : Glycolysis occurs in the cytoplasm.
Reason : Enzymes for glycolysis are found in the cytoplasm. It is common in aerobic and anaerobic respiration.

Glucose + $ATP$ $\rightarrow$ Glucose-$6$-phosphate. Which enzyme catalyzes this reaction?

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?