Which of the following best describes three important features of plasmids used in molecular cloning?

Question

BlackTom AI · Accepted Answer

When evaluating plasmids used in molecular cloning, several features are routinely highlighted for their functional roles.
Option 1: 'Restriction enzymes, antibiotic resistant genes, DNA polymerase' is incorrect because restriction enzymes are enzymes used to cut DNA, not a feature of the plasmid itself in the sense of its core cloning utility; DNA polymerase is an enzyme used in DNA replication and amplification, not a standard plasmid feature selection, whereas cloning plasmids typically emphasize selectable markers and replication control rather than the polymerase function.
Option 2: 'Antibiotic resistant genes, multiple cloning site, DNA polymerase' includes antibiotic resistance and MCS, which are relevant, but DNA polymerase is not a typical plasmid feature included for cloning purposes; polymerases are used in reactions outside the plasmid’s structural features, so this combination is not characteristic of a cloning plasmid's essential features.
Option 3: 'Antibiotic resistant genes, origin of replication, multiple cloning sites' lists three core elements: (1) an antibiotic resistance gene to enable selection of cells carrying the plasmid, (2) an origin of replication to ensure plasmid replication within the host, and (3) a multiple cloning site where foreign DNA can be inserted using restriction enzymes. These components together define the practical cloning utility of standard plasmids.
Option 4: 'Origin of replication, multiple cloning site, restriction enzymes' mentions origin of replication and MCS, and includes restriction enzymes, but 'restriction enzymes' are generally tools used in cloning rather than a defining plasmid feature. The way this option phrases it could be interpreted as the plasmid including specific restriction enzymes themselves, which is not a universal or essential trait for all cloning plasmids. The combination is therefore less accurate as a description of the three important features than option 3.
In summary, the strongest, most complete trio that captures the fundamental cloning-ready plasmid architecture is antibiotic resistance for selection, origin of replication for plasmid maintenance, and a multiple cloning site for inserting foreign DNA, aligning with standard teaching on plasmid design.

Which of the following best describes three important features of plasmids used in molecular cloning? 单项选择题

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