Lipids store double the amount of energy as compared to carbohydrates because of:
Correct answer: D. High proportion of C-H
- A. High proportion of oxygen
- B. High C-O ratio
- C. Low proportion of Carbon
- D. High proportion of C-H
Explanation
The normal oxidative process yields approximately 9 kcal per gram of fats, and approximately 4 kcal per gram for carbohydrates. Lipids are generally more "fully reduced" from a chemical perspective as they have significantly more C-C and C-H bonds and the energy is stored within these bonds. Under a normal oxidative process, these bonds are broken in the presence of oxygen to yield carbon dioxide, water, and energy (exothermic reaction).
This question appeared on the PMC National MDCAT 2020 paper, which you can sit online with every answer explained.
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About Lipids
Lipids include fats, oils, waxes, phospholipids and steroids, which are largely insoluble in water and soluble in organic solvents. Coverage includes glycerol and fatty acids, ester bond formation, saturated and unsaturated fats, triglyceride functions, and phospholipids in cell membranes.
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