Most proteins are made up of a type of amino acid:
Correct answer: A. 20
- A. 20
- B. 170
- C. 25
- D. 15
Explanation
The correct answer is 20. Proteins are synthesized from 20 different standard amino acids, which are encoded by the genetic code in organisms. These amino acids combine in various sequences to form the vast array of proteins necessary for life. The options 170 and 25 are incorrect because, although there are many amino acids in nature and some proteins include non-standard amino acids, only 20 are used by the ribosomes to build proteins in living organisms. Option 15 is incorrect, as it underrepresents the number of standard amino acids involved in protein synthesis.
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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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