What type of process is glycolysis?

Which of the following processes should not operate when organic acids are used as respiratory substrates?

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.

The universal hydrogen acceptor is

During phosphorylation in glycolysis,which $3C$ sugars are transformed into each other?

Where does glycolysis occur?