Question

Given below is the DNA coding sequence. Its complementary strand would read as:
5’ – GTATTACG – 3’

• A. 5’ – CUTUUTGC – 3’
• B. 3’ – CATAATGC – 5’
• C. 3’ – CUTUUTGC – 5’
• D. 5’ – CTUTTUGC – 3’

Answer 1

The Correct Option is B

To determine the complementary strand of the given DNA sequence, we need to understand the base pairing rules of DNA. In DNA, the bases pair as follows: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G). 

The given DNA sequence is 5’ – GTATTACG – 3’. We will find the complementary strand by pairing each base with its complement:

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

Therefore, the sequence of the complementary strand, starting from the 3' end, is:

3’ – CATAATGC – 5’

Thus, the correct answer is 3’ – CATAATGC – 5’.

Answer 2

To find the complementary strand of a given DNA sequence, we need to follow the base pairing rules of DNA:

• A (adenine) pairs with T (thymine)
• T (thymine) pairs with A (adenine)
• C (cytosine) pairs with G (guanine)
• G (guanine) pairs with C (cytosine)

The given DNA sequence is: 5' – GTATTACG – 3'
Using the base-pairing rules, the complementary strand would be:

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

Thus, the complementary strand reads: 3' – CATAATGC – 5'