Over 50% of the total dry weight of a cell consists of:
Correct answer: B. Proteins
- A. Lipids
- B. Proteins
- C. Carbohydrates
- D. Nucleic acids
Explanation
Proteins make up over 50% of the dry weight of cells because they are involved in nearly every cell function, including serving as enzymes, structural components, and in cell signaling and transport. While lipids, carbohydrates, and nucleic acids are also vital to cellular function, they do not constitute the majority of the cell's dry weight. Lipids are primarily involved in membrane structure and energy storage, carbohydrates provide energy and structural support, and nucleic acids are crucial for genetic information storage and transmission, but they do not have the same abundance in terms of dry weight as proteins.
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About Biological Molecules
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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