Question

Regarding Assertion and Reason, select the right option
Assertion [A]: $CaC{l}_2$ is necessary to create heat-shock competent cells.
Reason [R]: $CaC{l}_2$ imparts a positive charge to the cell.

• A. [A] is true and [R] is false.
• B. [A] is false and [R] is true .
• C. Both [A] and [R] are true and [R] is a correct explanation to [A].
• D. [Both [A] and [R] are true but [R] is not a correct explanation to [A].

Answer 1

The correct option is C Both [A] and [R] are true and [R] is a correct explanation to [A].

The cell membrane has a negative charge. This is not conducive for the transformation process. $CaC{l}_2$ gives the cell an overall positive charge. This helps the cell to accept the negatively charged DNA.