AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

RECOMBINANT DNA

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If a linear piece of DNA contains 3 recognition sites for a restriction enzyme. How many pieces will be produced when the restriction enzyme cuts the DNA?
A
2
B
3
C
4
D
5
Explanation: 

Detailed explanation-1: -These restriction enzymes cleave the plasmid at specific sites. On cleaving a circular DNA 3 fragments of DNA will be obtained as there are 3 recognition sites for restriction enzyme. Thus, the correct answer is option C.

Detailed explanation-2: -If a linear DNA molecule is digested with a restriction enzyme at four recognition sites, 4 fragments would be produced. II. If a closed circular DNA molecule is digested with a restriction enzyme at six recognition sites, 6 fragments would be produced. III.

Detailed explanation-3: -If a linear DNA molecule is digested with a restriction enzyme at four recognition sites on the DNA, 5 fragments would be produced.

Detailed explanation-4: -When a closed circular DNA molecule is digested with a restriction enzyme having six recognition sites, it will produce 6 DNA fragments.

There is 1 question to complete.