Which of the following terms best describes glucose in the process of cellular respiration?
a. reactant
b. enzyme
c. electron carrier
d. product

The correct answer would be A. Reactant.

Reactants are the chemical substances which are being used and transformed in order to produce products in a chemical reaction.

Glucose is used as a reactant in a cellular respiration.

In presence of oxygen, it is fully oxidized to produce energy (adenosine triphosphate or ATP), water and carbon dioxide.

The overall reaction of cellular respiration can be summarized as:

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.