The number of types of amino acids that are found to occur in cells is
Correct answer: A. 20
- A. 20
- B. 25
- C. 100
- D. 56
Explanation
The correct answer is 20. Cells use 20 standard amino acids to synthesize proteins, which are encoded by the genetic code. These are often referred to as the 'canonical' amino acids. While some organisms or proteins may incorporate additional amino acids, the core set used universally in protein synthesis is 20. Options B, C, and D suggest higher numbers that do not align with the standard amino acids used in cellular processes.
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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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