Structure Of Dna And Rna

A palindromic sequence is a DNA sequence that reads the same on both strands when read in the 5' to 3' direction. In this case, the sequence "GAATTC" on one strand is complementary to the sequence "CTTAAG" on the opposite strand.

The recognition of palindromic sequences by specific restriction enzymes is important in molecular biology. Many restriction enzymes recognize and cleave DNA at specific palindromic sequences. In this example, the palindromic sequence "GAATTC" is recognized by the restriction enzyme EcoRI, which cleaves the DNA at that specific site.

Therefore, the given base sequence represents a palindromic sequence, where the sequence on one strand is the reverse complement of the sequence on the other strand.

• Methods to make cells competent include use of disarmed pathogen vectors, micro-injection, and biolistics, all of which involve manipulating cells to enhance their ability to take up DNA.
• Elution does not relate to making cells competent for DNA uptake, as it is a method used in purification processes, not genetic transformation.

The correct answer is (C) : Elution.