What type of macromolecule has amino acids as its monomers?
A. Carbohydrate
B. Lipid
C. Protein
D. Fat
The Correct Answer and Explanation is :
The correct answer is C. Protein.
Explanation:
Proteins are macromolecules made up of amino acids as their monomers. These amino acids are the building blocks that link together in long chains through peptide bonds to form polypeptides. The sequence and arrangement of amino acids in a polypeptide determine the protein’s structure and function.
Each amino acid consists of a central carbon atom bonded to a hydrogen atom, a carboxyl group (-COOH), an amino group (-NH2), and a unique side chain or “R group” that differentiates the 20 different amino acids found in proteins. These side chains vary in size, charge, and chemical properties, allowing for the diversity of protein structures and functions.
Once amino acids are linked together, the chain folds into a specific three-dimensional shape, which is essential for the protein’s function. Proteins perform a wide range of critical functions in the body, including enzyme catalysis, transport, immune defense, cell signaling, and structural support.
Proteins are essential for life, as they are involved in nearly every cellular process. For example, enzymes are proteins that speed up biochemical reactions, and hemoglobin is a protein in red blood cells that carries oxygen throughout the body.
In contrast, carbohydrates (option A) are made of sugar monomers, lipids (option B) consist of fatty acids and glycerol, and fats (option D) are a subset of lipids. These macromolecules have different structures and functions, but none of them are made from amino acids.
In summary, proteins are the macromolecules composed of amino acids, and their sequence determines their structure and function within living organisms.