A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is :
Correct Answer :
Palindromic Nucleotide sequences
Solution :
The correct option is Palindromic Nucleotide sequences.
Restriction endonucleases are enzymes that cut DNA at specific points. They inspect the length of a DNA sequence and bind to a specific recognition sequence.
This recognition sequence is a palindromic nucleotide sequence. In DNA, a palindrome is a sequence of base pairs that reads the same on the two strands when the orientation of reading is kept the same (for example, 5' to 3' on both strands).
For example, the restriction enzyme EcoRI recognizes the following palindromic sequence:
5' - GAATTC - 3'
3' - CTTAAG - 5'
Let's briefly review why the other options are incorrect:
- Degenerate primer sequence: These are mixtures of primers with similar sequences used in PCR to amplify DNA from different organisms where the sequence is not fully known.
- Okazaki sequences: Also known as Okazaki fragments, these are short, newly synthesized DNA fragments formed on the lagging template strand during DNA replication.
- Poly(A) tail sequences: This refers to a stretch of RNA that has only adenine bases, added to the 3' end of a eukaryotic mRNA during post-transcriptional processing to protect it from degradation.
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