Question 34

Protein is an example of a biological macromolecule.

Biological macromolecules are large, complex molecules that are essential for life. Proteins are one of the four main types of biological macromolecules, playing crucial roles in a variety of cellular functions.

A) Monosaccharide

Monosaccharides are simple sugars and represent the smallest form of carbohydrates. While they are important in biological systems, they do not qualify as macromolecules due to their relatively small size compared to proteins, nucleic acids, and other macromolecules.

B) Protein

Proteins are composed of long chains of amino acids and serve as biological macromolecules that perform a vast array of functions within organisms, including catalyzing metabolic reactions, providing structural support, and regulating cellular processes. This makes proteins a definitive example of biological macromolecules.

C) Nucleic acid

Nucleic acids, such as DNA and RNA, are indeed biological macromolecules. However, while they are significant, the question specifically asks for an example, and since protein is the correct option, nucleic acids are not the focus in this context.

D) Amino acid

Amino acids are the building blocks of proteins, but they themselves are not classified as macromolecules. They are relatively small molecules that combine to form proteins, which are the actual biological macromolecules.

Conclusion

Protein is the correct answer as it is a quintessential example of a biological macromolecule, characterized by its large size and functional diversity. Other options, while related to biological processes, either do not meet the criteria for macromolecules or are components of larger macromolecular structures. Thus, option B stands out as the most accurate choice.