Question

Minisatellites
A) Are surrounded by conserved restriction sites.
B) Are also known as variable number of tandem repeats (VNTR)
C) Code for structural proteins only.
D) Both (A) and (B)

Answer 1

Hint:Minisatellites are tracts of DNA nucleotides consisting of around 10-60 base pairs long which are repeated several times and are found at numerous locations in the human genome.

Complete answer:
Minisatellites can be seen in the centromere or telomere of a chromosome, mostly at the sub-telomere region of the chromosome. Minisatellite also regulates gene expression. Minisatellites also protect the chromosome from fusion with adjacent chromosomes and are surrounded by restriction sites which are sequences on DNA that can be recognized only by a restriction enzyme for that DNA sequence.Since Minisatellites have repetitive DNA sequence it is also known as the Variable number of tandem repeats and the repeated DNA sequence are placed adjacent to each other.
>Option (A): Minisatellites are surrounded by restriction sites which can only be recognized by a particular restriction enzyme, Therefore this is the Correct option.
>Option (B): Minisatellites have various repeats of DNA sequence hence it is also known as a variable number of tandem repeats (VNTR). Therefore this is also a Correct option.
>Option(C): Minisatellites are repetitive sequences of DNA and they do not code for any structural protein, Therefore this is an Incorrect option.
>Option (D): Here both the options (A) and (B) are true. Therefore this is the Correct option.

Hence the correct answer is option ‘D’.

Note:
-Minisatellites show a very high mutation rate and it also shows high diversity. These minisatellites are very useful for DNA fingerprinting in Forensic Science.
-Wyman and White were the two scientists who discovered the first minisatellite in the year 1980.