Q.148 Botany ⭐ 360° Option Elimination Active

NEET 2021 Botany Question 148 Solution

Topic: Biomolecules · Official NTA Booklet Code M1

Question

Match List - I with List - II. (a) Protein (i) C=C double bonds (b) Unsaturated fatty acid (ii) Phosphodiester bonds (c) Nucleic acid (iii) Glycosidic bonds (d) Polysaccharide (iv) Peptide bonds List - I List - II Choose the correct answer from the options given below. (a) (b) (c) (d)

(1)(iv) (i) (ii) (iii)
(2)(i) (iv) (iii) (ii)
(3)(ii) (i) (iv) (iii)
(4)(iv) (iii) (i) (ii)

✓

Verified Against NTA Final Answer Key

Option (1) : (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

📚 Biomolecules Easy

📋 Given Parameters & Problem Setup

List I (Biomolecules) (a) Protein, (b) Unsaturated fatty acid, (c) Nucleic acid, (d) Polysaccharide

List II (Bonds) (i) C = C double bonds, (ii) Phosphodiester bonds, (iii) Glycosidic bonds, (iv) Peptide bonds

⚡

The 30-Second Exam Hall Shortcut: ⚡ Instant Biochemical Bond Matching!

⏱️ Save ~15 seconds

Proteins = Peptide bonds (a-iv); Unsaturated fatty acids = C=C double bonds (b-i); Nucleic acids = Phosphodiester bonds (c-ii); Polysaccharides = Glycosidic bonds (d-iii)! Gives (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) $\implies$ Option (1)!

1 (a) Protein: Formed of amino acids linked by Peptide bonds (

-CO-NH-

)

\implies

(iv).

2 (b) Unsaturated fatty acid: Contain one or more Carbon-Carbon double bonds (

C=C

)

\implies

(i).

3 (c) Nucleic acid: Nucleotides linked by

3'-5'

Phosphodiester bonds

\implies

(ii).

4 (d) Polysaccharide: Monosaccharides linked by Glycosidic bonds

\implies

(iii).

5 Match Option (1).

🛡️

Why You Can 100% Trust This Shortcut: Canonical NCERT Biomolecules on Nature of Bonds Linking Monomers in a Polymer.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Biochemical Nature of Macromolecular Linkages

Biopolymers are assembled from specific building blocks via characteristic condensation bonds:

\begin{aligned} \text{\textbf{Protein:}} & \quad \text{Amino acids linked via } -\text{CO}-\text{NH}- \text{ (Peptide bonds)} \implies \text{(a)-(iv)} \\[4pt] \text{\textbf{Unsaturated Fatty Acid:}} & \quad \text{Aliphatic chains with one or more } -\text{C}=\text{C}- \text{ double bonds} \implies \text{(b)-(i)} \\[4pt] \text{\textbf{Nucleic Acid:}} & \quad 3'-5' \text{ diester bond of phosphate group (Phosphodiester bonds)} \implies \text{(c)-(ii)} \\[4pt] \text{\textbf{Polysaccharide:}} & \quad \text{Dehydration between adjacent monosaccharide rings (Glycosidic bonds)} \implies \text{(d)-(iii)} \end{aligned}

Step 2

Option Alignment

Matching (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) points uniquely to Option (1).

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 1

✓ 100% Correct

Verdict & Scientific Reason:

Flawless pairing of all 4 biomolecular classes with their characteristic covalent bonds.

💡

Why this is airtight: None. Standard first-principles biochemistry.

2 2

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Protein with C=C double bonds and Unsaturated fatty acids with peptide bonds.

⚠️

Student Fallacy (Why candidates pick this trap): Inverting proteins and fatty acids.

3 3

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Protein with phosphodiester bonds and Nucleic acid with peptide bonds.

⚠️

Student Fallacy (Why candidates pick this trap): Swapping proteins with nucleic acids.

4 4

✗ Incorrect

Verdict & Scientific Reason:

Mismatches Unsaturated fatty acid with glycosidic bonds and Nucleic acid with double bonds.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing ester bonds with glycosidic bonds.

⚠️

NTA Trap Alert: Phosphodiester vs Glycosidic Bond Confusion

Students occasionally mix up nucleic acid backbone bonds (phosphodiester) with polysaccharide linkage bonds (glycosidic).

🛡️ How to avoid the -1 mark: Glycosidic = Sugar/carbohydrate (polysaccharide); Phosphodiester = Nucleic acid backbone.

📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Biomolecules Standard Benchmark

Core Scientific Principle Tested:

"In a polypeptide or a protein, amino acids are linked by a peptide bond. In a polysaccharide, monosaccharides are linked by glycosidic bond. In a nucleic acid, nucleotides are joined by phosphodiester bond. Unsaturated fatty acids have C=C double bonds."

Syllabus Focus: Nature of Bonds Linking Monomers in a Polymer

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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Classification & Functions of Biomolecules (Proteins, Polysaccharides & Secondary Metabolites)

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NEET 2021 Botany Question 148 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Instant Biochemical Bond Matching!

Step-by-Step Rigorous Workflow & Mathematical Proof

Biochemical Nature of Macromolecular Linkages

Option Alignment

360° Option Elimination Engine Key Feature

NTA Trap Alert: Phosphodiester vs Glycosidic Bond Confusion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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