If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

Q: If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

### Core Logic Adenine (A) base pairs with Thymine (T) with 2 hydrogen bonds, and Cytosine (C) base pairs with Guanine (G) with 3 hydrogen bonds. For the given DNA strand: A arrow T T arrow A G arrow C C arrow G T arrow A T arrow A C arrow G A arrow T ### Step 1: Sequence Matching Given sequence: A T G C T T C A Complementary: T A C G A A G T ### Pattern Recognition DNA base pairing strictly follows Chargaff's rule: A=T and G≡C. Just swap A with T, and C with G in the exact order. ### Evaluation

Year	2026	2025	2024	Total
Questions	9	19	8	36

Year

2026

2025

2024

Total

Questions

Solution & Explanation

Core Logic

Adenine (A) base pairs with Thymine (T) with 2 hydrogen bonds, and Cytosine (C) base pairs with Guanine (G) with 3 hydrogen bonds.

For the given DNA strand: $A arrow T$ $A \rightarrow T$ $T arrow A$ $T \rightarrow A$ $G arrow C$ $G \rightarrow C$ $C arrow G$ $C \rightarrow G$ $T arrow A$ $T \rightarrow A$ $T arrow A$ $T \rightarrow A$ $C arrow G$ $C \rightarrow G$ $A arrow T$ $A \rightarrow T$

Step 1: Sequence Matching

Given sequence: A T G C T T C A Complementary: T A C G A A G T

Nucleic Acids diagram for Q61 - JEE Main 2024 Morning

Pattern Recognition

DNA base pairing strictly follows Chargaff's rule: A=T and G≡C. Just swap A with T, and C with G in the exact order.

Chapter Mix

Class 12 Chemistry: Biomolecules

More Biomolecules Previous-Year Questions — Page 8

Q78 jee_main_2024_31_jan_morning Reactions of Glucose

Match List I with List II

LIST-I	LIST-II
A. Glucose/ $NaHCO₃$ $NaHCO_3$/ $Δ$ $\Delta$	I. Gluconic acid
B. Glucose/ $HNO₃$ $HNO_3$	II. No reaction
C. Glucose/HI/ $Δ$ $\Delta$	III. n-hexane
D. Glucose/Bromine water	IV. Saccharic acid

Choose the correct answer from the options given below:

A. $A-IV, B-I, C-III, D-II$ $\text{A-IV, B-I, C-III, D-II}$
B. $A-II, B-IV, C-III, D-I$ $\text{A-II, B-IV, C-III, D-I}$
C. $A-III, B-II, C-I, D-IV$ $\text{A-III, B-II, C-I, D-IV}$
D. $A-I, B-IV, C-III, D-II$ $\text{A-I, B-IV, C-III, D-II}$

Solution

Core Logic

Matching the reactions of glucose: (A) Glucose does not react with $NaHCO₃$ $NaHCO_3$, so there is no reaction. (A $arrow$ $\rightarrow$ II) (B) Oxidation of glucose with strong oxidizing agents like $HNO₃$ $HNO_3$ yields a dicarboxylic acid called saccharic acid. (B $arrow$ $\rightarrow$ IV) (C) Prolonged heating of glucose with $HI$ $HI$ forms n-hexane, indicating a straight chain of six carbon atoms. (C $arrow$ $\rightarrow$ III) (D) Oxidation with mild agents like bromine water converts glucose to gluconic acid. (D $arrow$ $\rightarrow$ I)

Chapter Mix

Class 12 Chemistry: Biomolecules

If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

Solution & Explanation

Core Logic

Step 1: Sequence Matching

Pattern Recognition

Chapter Mix

More Biomolecules Previous-Year Questions — Page 8

Solution

Core Logic

Chapter Mix

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If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:

Solution & Explanation

Core Logic

Step 1: Sequence Matching

Pattern Recognition

Chapter Mix

More Biomolecules Previous-Year Questions — Page 8

Solution

Core Logic

Chapter Mix

Select Your Target Exam

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Chapter Weightage & Trends

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