Step 1: Concept
Biomolecular structure of proteins and polysaccharides.
Step 2: Meaning
Structural characteristics of amino acid chains and carbohydrate linkages.
Step 3: Analysis
A is incorrect because the left end is the N-terminal, not C-terminal. B, C, and D are correct descriptions of protein folding, helicity, and polysaccharide formation via dehydration.
Step 4: Conclusion
The correct statements are B, C, and D.
Final Answer: (B)