Question

Immediate source of energy is

• A. Sucrose
• B. Glucose
• C. Fat
• D. Starch

Answer 1

The correct option is B Glucose

Glucose is a monomer which is formed of six carbon atom. The molecular formula is C${}_6$H${}_{12}$O${}_6$. It is a monosaccharide which acts as an instant source of energy. Glucose present in the blood is transported to the cell. Inside the cell, glucose is quickly broken down by the aerobic respiration to yield energy in the form of ATP. Sucrose and starch should be first broken down into individual monomers before they can be metabolized to give energy. Although fats yield more energy than glucose the process of fat breakdown takes time. So, the correct answer is option B.