Year: 2022
Topic: Molecular Basis of Inheritance
Time :
1.
Ten E. coli cells with
15
N- dsDNA are incubated in a medium containing
14
N nucleotides. After 60 minutes, how many E. coli cells will have DNA totally free from
15
N?
(1). 20 cells
(2). 40 cells
(3). 60 cells
(4). 80 cells