Final answer:
The α helices and β sheets are examples of protein secondary structure. A protein such as hemoglobin, which is composed of more than one protein subunit, has quaternary structure. A protein's amino acid sequence is known as its primary structure. A protein subunit is the modular unit from which many larger single-chain proteins are constructed. The three-dimensional conformation of a protein is its tertiary structure.
Step-by-step explanation:
The α helices and β sheets are examples of protein secondary structure. A protein such as hemoglobin, which is composed of more than one protein subunit, has quaternary structure.
A protein's amino acid sequence is known as its primary structure. A protein domain is the modular unit from which many larger single-chain proteins are constructed.
The three-dimensional conformation of a protein is its tertiary structure.