Question 20

Amino acids are the building blocks of proteins.

Amino acids serve as the fundamental units that combine to form proteins, making them essential for biological functions and structures.

A) Lipids

Lipids are a group of organic compounds that are insoluble in water, including fats, oils, and waxes. While they play crucial roles in cellular structure and energy storage, they are not involved in the formation of proteins, thus making this option incorrect.

B) Amino acids

Amino acids are indeed the correct answer as they are the organic compounds that link together through peptide bonds to form proteins. Each protein is made up of a specific sequence of amino acids that determine its structure and function.

C) DNA

DNA (deoxyribonucleic acid) contains the genetic blueprint for the synthesis of proteins but is not itself a building block of proteins. Instead, it provides the instructions for assembling amino acids into specific proteins, making this option incorrect.

D) Cells

Cells are the basic units of life and can contain proteins, but they are not the building blocks of proteins themselves. Proteins are synthesized within cells from amino acids, hence this option does not correctly address the question.

Conclusion

Amino acids are definitively the building blocks of proteins, as they directly combine to form these essential biomolecules. All other options either represent different classes of biological molecules or structures that do not contribute to protein synthesis, confirming that B is the only correct choice.