What is an amino acid?

What is an amino acid?

• A. Building block of protein; there are 20 types.
• B. A nucleotide in DNA.
• C. A type of sugar in RNA.
• D. A lipid molecule.

Answer: (A)

Amino acids are the building blocks of proteins. Each one has an amino group, a carboxyl group, a hydrogen, and a distinctive side chain (the R group) attached to a central carbon. They link together through peptide bonds to form polypeptides, which fold into the diverse proteins that do most of a cell’s work. There are 20 standard amino acids used to build these proteins, and their different side chains give each amino acid unique properties that shape protein structure and function. This idea sets amino acids apart from other biomolecules: nucleotides build DNA/RNA, sugars are components of nucleic acids and energy molecules, and lipids form fats and membranes.

Amino acids are the building blocks of proteins. Each one has an amino group, a carboxyl group, a hydrogen, and a distinctive side chain (the R group) attached to a central carbon. They link together through peptide bonds to form polypeptides, which fold into the diverse proteins that do most of a cell’s work. There are 20 standard amino acids used to build these proteins, and their different side chains give each amino acid unique properties that shape protein structure and function. This idea sets amino acids apart from other biomolecules: nucleotides build DNA/RNA, sugars are components of nucleic acids and energy molecules, and lipids form fats and membranes.