Question

question 4
the most common molecule used in cellular respiration of all organisms as a source of energy is:
a protein
b cellulose
c glucose
d sucrose
e lipid

Explanation:

Cellular respiration is a metabolic process. Glucose is the most common starting - molecule for this process in organisms as it can be easily broken down to release energy through glycolysis, the Krebs cycle, and oxidative phosphorylation. Proteins, cellulose, sucrose, and lipids can also be used for energy but require more complex processes to be converted into usable forms for cellular respiration.

Answer:

C. glucose