The tertiary structure of the protein molecule is represented by - Bbl6epure oAMH OTBer: a. beta helix b. beta - layer c. globular structure d. several a-helices forming a superhelix

The correct answer is d. several a-helices forming a superhelix.<br /><br />The tertiary structure of a protein molecule refers to the overall three-dimensional shape or conformation of the protein. It is the result of the folding and arrangement of the secondary structures, such as alpha-helices and beta-sheets, into a compact and stable structure.<br /><br />In the case of the protein molecule in question, the tertiary structure is represented by several alpha-helices forming a superhelix. This means that multiple alpha-helices are intertwined or stacked together to form a helical structure. This type of tertiary structure is commonly found in many proteins, including enzymes, transport proteins, and structural proteins.<br /><br />The other options provided are not accurate representations of the tertiary structure of a protein molecule:<br /><br />a. $\beta$ helix: This refers to a specific type of secondary structure, not the overall tertiary structure.<br />b. $\beta$-layer: This is another type of secondary structure, not the tertiary structure.<br />c. globular structure: While many proteins have a globular shape, this term does not specifically describe the tertiary structure.<br /><br />Therefore, the correct answer is d. several alpha-helices forming a superhelix.