Which element is normally absent in proteins?
Correct answer: D. P
- A. C
- B. N
- C. S
- D. P
Explanation
The correct answer is Option D. Phosphorus is not normally present in proteins; it is a key element in nucleic acids like DNA and RNA. Proteins are primarily composed of carbon, hydrogen, nitrogen, oxygen, and sometimes sulfur, but not phosphorus. This differentiates proteins from nucleic acids, which contain phosphorus as part of their backbone structure.
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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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