Lipids store double amount of energy as compared to carbohydrates because of:
Correct answer: D. High proportion of C-H bonds
- A. High proportion of oxygen
- B. Low proportion of carbon
- C. Lower proportion of C-H bonds
- D. High proportion of C-H bonds
Explanation
Option D is correct. Lipids store more energy than carbohydrates primarily because they have a higher proportion of carbon-hydrogen (C-H) bonds. These bonds are strong and release a large amount of energy when broken, which accounts for the higher energy content of lipids. In contrast, carbohydrates have more oxygen-hydrogen bonds, which release less energy. Option A is incorrect because lipids have a lower proportion of oxygen, not higher. Option B is incorrect because lipids have a high proportion of carbon. Option C is incorrect as lipids have more C-H bonds, not fewer.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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