In how many steps is glycolysis completed?

Select the correct option for glycolysis.

During cellular respiration,the number of $ATP$ molecules used during the conversion of glucose into glyceraldehyde-$3$-phosphate is:

Which enzyme breaks down fructose-$1,6$-bisphosphate?

The enzyme which converts glucose to glucose-$6$-phosphate is

Identify the chemical compounds represented by the following formulas:
$(1)$ $CH_3CH(OH)COOH$
$(2)$ $CH_3COCOOH$