Total number of amino acids discovered so far in cells and tissues are______________?
Correct answer: D. 170
- A. 20
- B. 25
- C. 150
- D. 170
Explanation
Although 20 amino acids are commonly used to build proteins, about 170 amino acids have been identified in cells and tissues, including non-protein amino acids. Students most often choose 20 because they confuse the standard protein-forming amino acids with the total number discovered.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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