Question

Write the base sequence of the complementary strand... (Please explain! thank you)

8. Base Sequence of Complementary DNA Strands Write the base sequence of the complementary strand (from 5' to 3') for the following one strand of a double-helical DNA, and then identify Palindrome sequence(s) or Mirror repeat sequence(s). i) 5'- GCGCAATATTTCTAGAAATATTGCGC - 3' ii) 5'-TTAGCACGTGCTAA-3' iii) 5'-TTAGCACCACGATT-3'

Answer 1

1)5-GCGCAATA TTTCT AGAAATAT TGCGC-5? 3' CGCGTTATAAA GATCTTTATAACGCG-57 Pallindrome 2) 5' TTAGCAC GTGCTAA 3/ 3' AATCG TGCACGATT 5' Pallindroame 3) 5'-TTAGCA CAGAT7-3/ 3'-AATCGT GTC TAA-SI Mirror repeat

To find out the sequence of complementary strand, you just have to write adenine in place of thymine and vice versa. And you have to write guanine in place of fytofin and vice versa.

This is because adenine pairs with thymine by two hydrogen bonds and vice versa guanine pairs with cytosine by 3 hydrogen bond and vice versa.

Palindromic sequences are those which read the same in both the strands, that is they have a same sequence in the upper and in the lower strand.

Mirror repeat are those with repeat themselves after a certain stretch of nucleotides and appear as mirror images to each other.

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