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(B) Plasmids are small,circular,double-stranded $DNA$ molecules that are distinct from a cell's chromosomal $DNA$.They are extrachromosomal and capabl

Vedclass · Accepted Answer

$b, c$ and $d$ only

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(B) Plasmids are small,circular,double-stranded $DNA$ molecules that are distinct from a cell's chromosomal $DNA$.They are extrachromosomal and capable of autonomous (self) replication.They do not contain essential genes required for the basic survival of the bacteria; instead,they often carry genes that provide advantages like antibiotic resistance.Plasmids are not present in all bacteria.Therefore,the characteristics that are $NOT$ applicable to plasmids are: $(b)$ Linear $DNA$,$(c)$ Present in all bacteria,and $(d)$ Contain essential genes.Thus,the correct option is $b, c$ and $d$ only.

Column-$I$	Column-$II$
$(a) \ Cla \ I$	$(1) \ \text{Antibiotic resistance gene}$
$(b) \ pBR322$	$(2) \ \text{Origin of replication}$
$(c) \ tet^R$	$(3) \ \text{Restriction enzyme}$
$(d) \ ori$	$(4) \ \text{Plasmid}$

Select the option that excludes characteristics applicable to plasmids:
$(a)$. Circular $DNA$
$(b)$. Linear $DNA$
$(c)$. Present in all bacteria
$(d)$. Contain essential genes
$(e)$. Extra chromosomal self-replicating

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Match the following columns:
Column-$I$ Column-$II$
$(a) \ Cla \ I$ $(1) \ \text{Antibiotic resistance gene}$
$(b) \ pBR322$ $(2) \ \text{Origin of replication}$
$(c) \ tet^R$ $(3) \ \text{Restriction enzyme}$
$(d) \ ori$ $(4) \ \text{Plasmid}$

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Select the option that excludes characteristics applicable to plasmids:$(a)$. Circular $DNA$$(b)$. Linear $DNA$$(c)$. Present in all bacteria$(d)$. Contain essential genes$(e)$. Extra chromosomal self-replicating