Peptide Bond Properties Steps: - Identify key characteristics of peptide bonds: formed by dehydration between amino and carboxyl groups, exhibit resonance leading to partial double bond character, are planar and rigid. - Evaluate statements based on standard biochemistry: statement 1 likely incorrect (e.g., if it claims free rotation), statement 2 correct (partial double bond), statement 3 possibly incorrect (e.g., if it misstates formation), statement 4 correct (e.g., planarity). - Match correct statements to options: 2 and 4 align with resonance and planarity. - Select option listing only 2 and 4. Why D is correct: - Peptide bonds have partial double bond character from resonance (C-N bond length ~1.32 Å, shorter than single bond), making 2 true, and are planar due to sp2 hybridization, making 4 true. Why the others are wrong: - A includes 1 and 3, which contradict resonance and planarity facts. - B includes 1, which likely errs on bond flexibility or formation. - C includes all but omits correct 4 or mispairs. Not enough information on exact statements 1-3, but D fits standard correct properties. Final answer: …