Which one of the following statement is not true regarding gel electrophoresis technique?

Given below are two statements:

Statement I : Restriction endonucleases recognise specific sequence to cut DNA known as palindromic nucleotide sequence.

Statement II : Restriction endonucleases cut the DNA strand a little away from the centre of the palindromic site.

In the light of the above statements, choose the most appropriate answer from the options given below :

Which of the following is not a desirable feature of a cloning vector?