Question

Given below is a sample of a portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it?
 5'- GAATTC - 3'
3'- CTTAAG - 5'
(A) Detection mutation
(B) Start codon at the 5'end
(C) Palindromic sequence of base pairs
(D) Replication completed

Answer 1

Hint:Water conservation is the process by which one uses water efficiently and avoids unnecessary wastage of water.

Complete answer
In the above given question, the complementary strand is the same while reading from opposite directions i.e. from 5' to 3' and 3' to 5' on the other, complementary strand. Hence, it represents a
Palindromic sequence. “Palindrome” is a word that reads the same from both directions.

 A complementary sequence is the double stranded sequence that has matching base pairs with a particular nucleotide sequence. Purine always pairs with a pyrimidine and pyrimidine always base paired with purin.

A palindromic sequence is the same backwards and forwards on both sides, a sequence made up of nitrogen bases within a double helix of DNA and/or RNA. These sequences are a short run of bases (typically 3 to 5 in length), followed by their complementary bases in reverse order.

Double-stranded DNA is responsible for the cut at specific locations that is due to the pattern of bases present at those locations. This implies that the enzyme recognizes the sequence regardless of which side the enzyme is approaching the DNA. Both the DNA strands that are cut also get increased by a palindromic sequence.

Thus, the correct answer is option ‘C’. Palindromic sequence of base pairs.

Note:Palindromic repeats are found in archaea and bacterial genome where its key role is basically to provide immunity against foreign genetic elements like plasmids. An exact palindrome is mostly equal in length in a nucleic acid sequence.