Which of the following elements is not present in all proteins?
Correct answer: C. Sulphur
- A. Carbon
- B. Hydrogen
- C. Sulphur
- D. Nitrogen
Explanation
All proteins contain the elements carbon, hydrogen, oxygen and nitrogen except sulphur.
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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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