(D) Plasmids are small,circular,double-stranded $DNA$ molecules that are distinct from a cell's chromosomal $DNA$. They are naturally found in bacteri

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They are widely used in genetic engineering.

(D) Plasmids are small,circular,double-stranded $DNA$ molecules that are distinct from a cell's chromosomal $DNA$. They are naturally found in bacteria and some eukaryotes like yeast. In biotechnology,plasmids are extensively used as vectors to carry foreign genetic material into another cell,making them essential tools in genetic engineering.

Class 12 Biology Biotechnology: Principles and Processes Tools of recombinant DNA technology

Which of the following statements is true regarding plasmids?

A
They are found in viruses.
B
They contain genes for vital life processes.
C
They are a part of the chromosomal $DNA$.
D
They are widely used in genetic engineering.

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Chapter

Biotechnology: Principles and Processes

Subtopic

Tools of recombinant DNA technology

Which of the following is known as a natural genetic engineer?

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Match the columns:

Column-$I$ Column-$II$

$(a)$ Ligase $(i)$ It removes nucleotides from $DNA$ ends.

$(b)$ Endonuclease $(ii)$ Connects parts of $DNA$.

$(c)$ Exonuclease $(iii)$ Removes phosphates from $DNA$.

$(d)$ $DNA$ Polymerase $(iv)$ It produces sticky ends in $DNA$.

$(v)$ Useful for repeated amplification.

Column-$I$	Column-$II$
$(a)$ Ligase	$(i)$ It removes nucleotides from $DNA$ ends.
$(b)$ Endonuclease	$(ii)$ Connects parts of $DNA$.
$(c)$ Exonuclease	$(iii)$ Removes phosphates from $DNA$.
$(d)$ $DNA$ Polymerase	$(iv)$ It produces sticky ends in $DNA$.
	$(v)$ Useful for repeated amplification.