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The Ti-plasmid is found in ـــــــــــــــــــــ.


A) Escherichia coli
B) yeast
C) Agrobacterium tumefaciens
D) plants

E) C) and D)
F) None of the above

Correct Answer

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All plasmids are circular

A) True
B) False

Correct Answer

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Which of the following might be plasmid-encoded?


A) toxins
B) antibiotic resistance
C) plant hormones
D) all of the above

E) A) and B)
F) C) and D)

Correct Answer

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D

Which family of plasmids carries genes for antibiotic resistance?


A) R-plasmids
B) F-plasmids
C) P-plasmids
D) X-plasmids

E) B) and D)
F) C) and D)

Correct Answer

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A

Bidirectional replication for F-plasmids occurs at theــــــــــــــــــ .


A) origin of vegetative replication
B) origin of transfer
C) origin of chromosomal replication
D) linear ends

E) C) and D)
F) B) and D)

Correct Answer

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Plasmids are self-replicating extrachromosomal pieces of DNA.

A) True
B) False

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Transferable plasmids useــــــــــــــــ as a form of replication during transfer.


A) bidirectional replication
B) rolling circle replication
C) conservative
D) none of the above

E) None of the above
F) B) and D)

Correct Answer

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Plasmids in the same family are incompatible becauseــــــــــــــــــــــ .


A) they are transferable
B) they produce toxins
C) they carry genes for antibiotic resistance
D) they have similar DNA sequences in the replication genes

E) All of the above
F) None of the above

Correct Answer

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Rolling circle replicationـــــــــــــــــــــــ .


A) begins when the origin of replication is pulled apart to generate a replication bubble
B) occurs at the origin of vegetative replication
C) begins when the origin of replication is nicked and one strand is unrolled
D) occurs when a plasmid replicates in step with host cell division

E) B) and D)
F) B) and C)

Correct Answer

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Which one of the following organisms does not have plasmids?


A) bacteria
B) viruses
C) yeast
D) archaea

E) C) and D)
F) A) and C)

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The Ti-plasmid was used as the platform for genetically engineering plants.

A) True
B) False

Correct Answer

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True

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