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Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYBiotechnology: Principles and Processes1 Mark
Question
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.
  1. Both assertion and reason are true and reason is the correct explanation of assertion.
  2. Both assertion and reason are true but reason is not the correct explanation of assertion.
  3. Assertion is true but reason is false.
  4. Both assertion and reason are false.
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 DNA enters the bacterium through pores in its cell wall.
✓

Answer

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

Explanation:

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 DNA can enter the bacteria through pores of cell wall because DNA is a hydrophilic molecule and it cannot pass through cell membrane so making bacterial cell competent ease the process to take up DNA.

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