Question

exam lesson name: introduction to biotechnology
exam number: 700705rr
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question 7 of 20 :
select the best answer for the question.

1. which of the following features of a plasmid allow the dna to be replicated in the host cell?

○ a. origin of replication
○ b. antibiotic resistance
○ c. lacz operon
○ d. multiple cloning site
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Explanation:

To determine the feature of a plasmid that allows DNA replication in a host cell, we analyze each option:

• Option A: The origin of replication (ori) is a specific DNA sequence where replication starts. Plasmids with an ori can utilize the host cell's replication machinery to duplicate their DNA.
• Option B: Antibiotic resistance genes are for selecting transformed cells, not for replication.
• Option C: The LacZ operon is involved in lactose metabolism and is used for blue - white screening in cloning, not replication.
• Option D: Multiple cloning sites are for inserting foreign DNA, not for replication.

Answer:

A. Origin of replication