Two statements are given - one labelled Assertion and the other l… - Vidyadip

MCQ

Two statements are given $-$ one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Bacterial cells are made competent by treating them with specific concentration of a divalent cation.
Reason : Treatment of bacterial cell with a divalent cation increases the efficiency with which $\text{DNA}$ enters the bacterium through pores in its cell wall.

✓
Both assertion and reason are true and reason is the correct explanation of assertion.
B
Both assertion and reason are true but reason is not the correct explanation of assertion.
C
Assertion is true but reason is false.
D
Both assertion and reason are false.

✓

Answer

Correct option: A.

Both assertion and reason are true and reason is the correct explanation of assertion.

The bacterial cell is made competent by treating it with specific concentration of a divalent cation such as calcium to increase the efficiency with which $\text{DNA}$ can enter the bacteria through pores of cell wall because $\text{DNA}$ is a hydrophilic molecule and it cannot pass through cell membrane so making bacterial cell competent ease the process to take up $\text{DNA}$.

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