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 …

Answer 2

1. Understanding the Base Pairing in DNA:
In DNA, base pairs follow specific pairing rules: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G). These rules are known as Chargaff’s rules.

2. Identifying the Complementary Chain:
Given the sequence "G A T G C," the complementary bases will be as follows:

• G pairs with C
• A pairs with T
• T pairs with A
• G pairs with C
• C pairs with G

Hence, the complementary chain will be "C T A C G."

 

Final Answer:
The complementary chain to the given sequence "G A T G C" is (C) "C T A C G."