molecular biology Questions

The process of translation of mRNA to proteins begins as soon as:

Read the following statements and choose the set of correct statements:(a) Euchromatin is loosely packed chromatin(b) Heterochromatin is transcriptionally active(c) Histone octamer is wrapped by negatively charged DNA in nucleosome(d) Histones are rich in lysine and arginine.(e) A typical nucleosome contains $400$ bp of DNA helixChoose the correct answer from the options given below:

In an E. coli strain the i gene gets mutated and its product cannot bind the inducer molecule. If the growth medium is provided with lactose, what will be the outcome?

If the length of a DNA molecule is $1.1\text{metres}$, what will be the approximate number of base pairs?

Ten E. coli cells with ${}^{15}\text{N}$ -dsDNA are incubated in a medium containing ${}^{14}\text{N}$ nucleotides. After $60$ minutes, how many E. coli cells will have DNA totally free from ${}^{15}\text{N}$?