Name the plasmid which makes host cell resistance to the antibiotic?
A.
Hfr
B.
F-plasmid
C.
Col plasmid
D.
R-plasmid
Answer: Option D
Explanation:
R plasmid stands for resistance plasmid which makes cell resistant to antibiotics. They have genes which code for enzymes that are capable of destroying or modifying antibiotics.
Which of the following is NOT the property of plasmid?
A.
Rolling circle replication
B.
Narrow host range
C.
Two closely related plasmids cannot coexist in the same cell
D.
Encodes gene products that are essential for growth
Answer: Option B
Explanation:
Plasmids can have narrow as well as broad host range as when it exists only in a limited number of closely related bacteria, it shows narrow host range while if it transferred to and maintained in a large number of bacteria, it shows broad host range.
Name the type of plasmid which has no identified function or phenotypic properties?
A.
Cryptic plasmid
B.
R-plasmid
C.
High-frequency recombination
D.
Col plasmid
Answer: Option A
Explanation:
Cryptic plasmids do not code for genes that contribute any phenotypic properties or identified functions. They have no clear use for organisms in which they were identified.
Which of the following plasmid found in eukaryotes?
A.
Col plasmid
B.
2μ circle
C.
F-plasmid
D.
Hfr
Answer: Option B
Explanation:
Plasmids are found not only in prokaryotes but also in eukaryotes. Yeast plasmid is a 2μ circle, which is 6.3kb circular, extrachromosomal in nature and found in the nucleus of the yeast strain.
