CBSE 2026 · Region 4 · Set 3 · Q24 · 3 marks
(a)Draw a figure of E. coli vector pBR322 and label the following :(i)Origin of replication(ii)Ampicillin resistance site(iii)Tetracyclin resistance site(iv)"rop"(b)Mention the significance of origin of replication.
(a)
Draw a figure of E. coli vector pBR322 and label the following :
(i)
Origin of replication
(ii)
Ampicillin resistance site
(iii)
Tetracyclin resistance site
(iv)
"rop"
(b)
Mention the significance of origin of replication.
Marking-scheme solution
(a)
(b)
ori- is a sequence from where replications starts and any piece of DNA when linked to this sequence can be made to replicate within the host. /
Control copy numbers of linked DNA.
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.