Lipids contain double amount of energy as compared to the same amount of carbohydrates due to the presence of:
Correct answer: B. Higher proportion of C-H bonds
- A. Lower proportion of C-H bonds
- B. Higher proportion of C-H bonds
- C. Higher proportion of oxygen
- D. None of these
Explanation
Option B is correct. Yes, that is correct. Lipids contain more energy than carbohydrates because they have a higher proportion of carbon-hydrogen bonds and lower proportion of oxygen. Carbon-hydrogen bonds are very strong and require a lot of energy to break. When lipids are broken down, the energy from these bonds is released. Carbohydrates, on the other hand, have a higher proportion of oxygen-hydrogen bonds. Oxygen-hydrogen bonds are not as strong as carbon-hydrogen bonds, so they release less energy when they are broken down. This is why lipids are considered to be a more concentrated source of energy than carbohydrates. A gram of fat contains about 9 calories, while a gram of carbohydrate contains about 4 calories.
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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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