A circular bacterial plasmid consists of 1000 base pairs (bp). A specific restriction enzyme has three recognition sites within this plasmid.
The sites are at 150 bp, 250 bp and 950 bp. After complete restriction, what size are the fragments?
A 100 bp, 200 bp and 700 bp only
B 100 bp, 150 bp, 200 bp only
C 50 bp, 100 bp, 150 bp and 700 bp only
D 50 bp, 100 bp and 700 bp only
E 50 bp, 100 bp, 150 bp, 200 bp and 700 bp
why is the answer A and not E
