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Biomolecules question

2024 · 1 Feb · Shift 1 · Q16
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Biomolecules question

2024 · 1 Feb · Shift 1 · Q16

JEE MainChemistryBiomoleculesMCQ+4 / −1
If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is :
  1. A
    CATTAGCT
  2. B
    TACGAAGT
  3. C
    ATGCGACT
  4. D
    GTACTTAC
View written solutionFree

Correct answer: B

  1. Use DNA base-pairing rules

    In DNA, the complementary bases are:

    • A↔TA \leftrightarrow TA↔T
    • G↔CG \leftrightarrow CG↔C
  2. Given strand

    The DNA strand is: A T G C T T C A\text{A T G C T T C A}A T G C T T C A

  3. Write the complementary base for each position

    • A→TA \to TA→T
    • T→AT \to AT→A
    • G→CG \to CG→C
    • C→GC \to GC→G
    • T→AT \to AT→A
    • T→AT \to AT→A
    • C→GC \to GC→G
    • A→TA \to TA→T

    So the complementary strand is: T A C G A A G T\text{T A C G A A G T}T A C G A A G T

  4. Match with options

    TACGAAGT\text{TACGAAGT}TACGAAGT

    This matches Option B.

  5. Conclusion

    The sequence of bases in the complementary strand is: TACGAAGT\boxed{\text{TACGAAGT}}TACGAAGT​

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