The Question is from neet-botany , and it was created by the author NISHANTH

Question

Which bond is NOT involved in linking monomers in biological macromolecules?

NISHANTH · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
 **Primary Concept**: Biological Macromolecules and their Bonds
 **Related Topics**: Carbohydrates, Proteins, Nucleic Acids, Lipids
 **Prerequisites**: Understanding of the basic structures of carbohydrates, proteins, and nucleic acids.
## SOLUTION PATHWAY
**Given Information**:
  The question asks to identify the bond NOT involved in linking monomers of biological macromolecules.
**Method & Steps**:
 1. Identify the bonds involved in linking monomers of major biological macromolecules.
  Reasoning: We need to examine the types of bonds that form the backbone of carbohydrates, proteins, and nucleic acids.
 2. Analyze each option.
  Working:
  * Glycosidic bonds link monosaccharides in carbohydrates.
  * Peptide bonds link amino acids in proteins.
  * Phosphodiester bonds link nucleotides in nucleic acids.
  * Disulfide bonds are covalent bonds between two cysteine residues within a protein; they create cross-links in the tertiary structure of proteins, but don't link the monomers (amino acids) themselves.
 3. Determine the bond that doesn't directly link monomers.
  Result: Disulfide bonds do not link monomers to form the primary structure of biological macromolecules; they form cross-links within a macromolecule.
  Verification:  Review the functions of each bond type in the context of macromolecule formation.
 ## OPTION ANALYSIS
A :x: Glycosidic bonds link monosaccharides in polysaccharides.
B :x: Peptide bonds link amino acids in polypeptides.
C :x: Phosphodiester bonds link nucleotides in nucleic acids.
D ✓: Disulfide bonds form cross-links within proteins but don't link the amino acid monomers to create the polypeptide chain. They stabilize the tertiary structure.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing disulfide bonds with peptide bonds:  Disulfide bonds are covalent but they don't create the primary sequence of amino acids. 
  2.Overlooking the specific role of each bond: Each bond type has a unique role in macromolecule construction.   
 **Quick Tips**:
  1.Focus on the primary structure of each macromolecule type:  The primary structure is defined by the sequence of monomers.
  2.Remember that disulfide bonds are important for protein folding, but not for the initial linking of amino acids.

NISHANTH · Answer

Glycosidic bond

NISHANTH · Answer

Peptide bond

NISHANTH · Answer

Phosphodiester bond

NISHANTH · Answer

The correct Option is "Disulfide bond"

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