NEET BIOLOGY

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GENETICS AND EVOLUTION

MOLECULAR BASIS OF INHERITANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If the sequence of the 5’-3’ strand is AATGCTAC, then the complementary sequence has the following sequence:
A
3’-AATGCTAC-5’
B
3’-CATCGTAA-5’
C
3’-TTACGATG-5’
D
3’-GTAGCATT-5’
Explanation: 

Detailed explanation-1: -Because of the complimentary base pairing rule, if the strand sequence is AATGCTAC, the complementary sequence will be TTACGATG. As a result, option (c) is right.

Detailed explanation-2: -The sequence of the mentioned DNA strand is 5’-ATCAGC-3’. So, the sequence of the complementary strand will be 3’-TAGTCG-5’.

Detailed explanation-3: -Adenine makes the double bond with thymine while guanine makes the triple bond with cytosine which means adenine and thymine are complementary base pairs and cytosine and guanine are complementary base pairs. The complementary sequence for the DNA strand 5’ ATCGAACGT 3’ is 3’ TAGCTTGCA 5’.

Detailed explanation-4: -DNA is always synthesized in the 5’-to-3’ direction, meaning that nucleotides are added only to the 3’ end of the growing strand.

Detailed explanation-5: -So, the sequence of the complimentary strand in 5’ to 3’ direction is 5’-GCATGCATGCATGCATGCATGCATGCAT− 3’. Was this answer helpful?

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