Which of the following element is present only in all proteins?
Correct answer: C. Nitrogen
- A. Sulfur
- B. Carbon
- C. Nitrogen
- D. Oxygen
Explanation
Chemically, proteins are complex nitrogenous organic compounds, which are associated with the concept of life itself.By chemical composition, proteins are composed of carbon, hydrogen, oxygen, and nitrogen. Some proteins also contain smaller quantities of sulfur and phosphorus.The percentage of nitrogen is fairly constant and is about 16% of the molecular weight of protein. Hence, C is the correct option.
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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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