Final answer:
The B-pleated sheet conformation is a sheetlike arrangement in which polypeptide chains are aligned side by side. It is connected by interchain hydrogen bonding and is important in structural proteins like silk fibroin.
Step-by-step explanation:
The B-pleated sheet conformation is a common type of secondary structure in proteins. It is a sheetlike arrangement in which two or more extended polypeptide chains (or separate regions on the same chain) are aligned side by side. The aligned segments can run either parallel or antiparallel, and are connected by interchain hydrogen bonding.
Example: In silk fibroin, the B-pleated sheet is particularly important for its structural properties.