Which of the following elements is not usually present in all proteins?
Correct answer: D. Sulphur
- A. Carbon
- B. Hydrogen
- C. Nitrogen
- D. Sulphur
Explanation
Proteins are made from amino acids, and out of the 20 available amino acids, only two contain sulfur.
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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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