How does isomerism in isoleucine affect its structure compared to leucine?

• A. Isoleucine has the same atoms as leucine but arranged differently.
• B. Isoleucine has fewer carbon atoms than leucine.
• C. Isoleucine forms a cyclic structure unlike leucine.
• D. Isoleucine has additional electronegative atoms compared to leucine.

Answer: (A)