Question

Primary structure in a nucleic acid contains bases as G A T G C …..… The chain which is complementary to this chain is

• A. G G T G A ….
• B. T G A A G ….
• C. C T A C G …
• D. T T T A G ….

Answer 1

The Correct Option is C

In a nucleic acid chain, the bases pair according to complementary base pairing rules:

Adenine (A) pairs with Thymine (T) (in DNA) or Uracil (U) (in RNA).
Guanine (G) pairs with Cytosine (C).

The given primary structure is: G A T G C .......

Now, applying the complementary base pairing rules:
G pairs with C.
A pairs with T.
T pairs with A.
G pairs with C.
C pairs with G.
The complementary strand is: C T A C G .......

The correct answer is (C) : C T A C G …