If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:
Biomolecules · Class 12 · JEE Main Previous Year Question
If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is:
- a
CATTAGCT
- b✓
TACGAAGT
- c
GTACTTAC
- d
ATGCGACT
TACGAAGT
Step 1: Complementary Pairing Rules — In DNA strands, Adenine (A) always pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).
Step 2: Sequence Transformation — For the sequence ATG CTT CA, we replace each base with its partner: A\to T, T\to A, G\to C, C\to G, T\to A, T\to A, C\to G, A\to T.
Step 3: Final Sequence — The complementary strand sequence is TAC GAA GT. Correct option is (b).
Key Point: Always keep the direction in mind when reading sequences.
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