What is the conformation of lambda phage DNA when it is isolated from the phage particle（）
A. Supercoiled
B. Open circular
C. Linear
D. Linear duplex
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The cycle which is completed quickly in the infection by a phage is__（）
A. Lysogenic
B. Lytic
C. Replication
D. Capsid formation
Which of the following statements is NOT typically true of a plasmid（）
A. It inserts the gene of interest into the bacterial chromosome
B. It is a circular molecule DNA
C. It can be used as a vector to clone DNA
D. It has cleavage sites for restriction nucleases
E. It has a selectable property, such as antibiotic resistance
The number of molecules of an individual plasmid that are normally found in a single bacterial cell is known as（）
A. Conjugative ability
B. Copy number
Competency
D. Replicative ability
What is an advantage of using a bacteriophage, compared with a plasmid（）
A. Phages can be used to kill bacteria, and sterilize an area
B. Plasmids do not contain restriction sites
C. Bacteriophages can carry much longer DNA fragments than plasmids
D. Bacteriophages can carry smaller fragments than plasmids
E. Plasmids will not reproduce within bacteria
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