The Question is from neet-botany biomolecules-biology , and it was created by the author B VENKAT

Question

Which of the following is NOT a characteristic of the peptide bond linking amino acids in proteins?

B VENKAT · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Peptide bond characteristics
 **Related Topics**: Protein structure, amino acids
 **Prerequisites**: Basic understanding of chemical bonds and organic chemistry.
## SOLUTION PATHWAY
**Given Information**:
The question asks to identify the characteristic that is NOT true for a peptide bond.
**Method & Steps**:
1. Analyze each option:
  Reasoning: Peptide bonds are formed between the carboxyl group (-COOH) of one amino acid and the amino group (-NH2) of another amino acid, releasing a water molecule. This forms a C-N bond.
  Formula/Rule: The general reaction is:  $R_1-COOH + H_2N-R_2 ightarrow R_1-CO-NH-R_2 + H_2O$
2. Evaluate each option:
  Working:
  a) Partial double bond character: Due to resonance, the peptide bond exhibits partial double bond character, making it rigid and planar.
  b) Planar structure: The resonance structure forces the peptide bond to be planar.
  c) Free rotation around the C-N bond: The partial double bond character restricts free rotation around the C-N bond.
  d) Trans configuration: Steric hindrance favors the trans configuration (R groups on opposite sides) over the cis configuration.
 3. Identify the incorrect option:
  Result: Option C, 'Free rotation around the C-N bond', is incorrect because the partial double bond character restricts rotation.
  Verification: The other options (partial double bond character, planar structure, and trans configuration) are all characteristics of the peptide bond.
 ## OPTION ANALYSIS
A ✓: Partial double bond character is a key feature of the peptide bond due to resonance.
B ✓: The planar structure is a direct consequence of the partial double bond character.
C :x: Free rotation around the C-N bond is restricted because of the partial double bond character and resonance structure.
D ✓: The trans configuration is preferred due to less steric hindrance.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing peptide bonds with other types of bonds:  Remember the unique characteristics arising from resonance.
  2.Ignoring the impact of resonance: Resonance is crucial in understanding the rigidity and planarity of the peptide bond.
 **Quick Tips**:
  1.Remember the resonance structure of the peptide bond to quickly recall its properties.
  2.Visualize the planar structure to help understand the restricted rotation.

B VENKAT · Answer

Partial double bond character

B VENKAT · Answer

Planar structure

B VENKAT · Answer

The correct Option is "Free rotation around the C-N bond"

B VENKAT · Answer

Trans configuration

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