Vector Biology MCQs : This section focuses on the "Vector Biology". These Multiple Choice Questions (MCQs) should be practiced to improve the Vector Biology skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Which of the following is true for a plasmid?
A. Contains an origin of replication
B. Imparts a useful characteristic to the host bacterium
C. Possesses one or more genes
D. Replicates only when the host genome is undergoing replication
Which of the following is an example of head-and-tail bacteriophage?
B. Lambda phage
What are sticky ends?
A. Ends of M13 vector
B. 12 nucleotide stretch in lambda phage
C. The replicated product phage DNA
D. Ends on two sides of origin
Which of the following is not true for a bacteriophage?
A. A very simple structure
B. Consist either DNA or RNA
C. Bacteriophages are viruses
D. Complex structure that infects bacteria
What are relaxed plasmids?
A. The ones having copy numbers above 50 per cell
B. The ones that can’t be digested by endonucleases
C. The ones that can’t be isolated
D. The ones present in more than one strains of the same host
Col plasmids are responsible for ______
A. Degrading unusual molecules
B. Taking up colchicine stain
C. Coding for colicins
D. None of the above
What is the capsid (protective coat) of the bacteriophage made up of?
D. Organic acids
To be able to coexist in the same cell, different plasmids must be ______
B. Of high copy number
C. Stable at high temperatures
Which of the following is not a type of plasmid?
The cycle which is completed quickly in the infection by a phage is ________
D. Capsid formation
Which of the following statements is not true in the context of infection by an M13 phage?
A. Lytic phage
B. Lysogenic phage
C. New phage particles are continually synthesized
D. The DNA is not integrated in host genome
Approximate size of lambda phage is _______
A. 23 kb
B. 100 kb
C. 49 kb
D. 12 kb
What are the possible ways through which a plasmid can replicate?
A. Using cell’s own replicative enzymes
B. Carry genes that code for special replicative enzymes
C. Replicate by inserting themselves into a bacterial chromosome
D. Carry genes that codes enzymes
Protection by covalent attachment of proteins in a plasmid, is a method for?
A. increasing the conjugative abilities
B. protection of linear DNA
C. increasing the copy number
D. increasing cloning efficiency
Which among the following are the smallest plasmid and an ideal cloning vector?
How can conjugative and non-conjugative plasmids be differentiated?
A. On the basis of size
B. Presence of antibiotic resistance
C. Number of cloning and digestion sites
D. Presence of transfer genes
Which characteristics do F-plasmids confer to the host bacterium?
A. Antibiotic resistance
B. Fluorescent colonies
C. Conjugative ability
Ti plasmids are ____ plasmids.
A. Tumor inducing
C. High copy number
Which is a reason of instability of phage DNA molecule in the host cell in a lytic cycle?
A. The huge size of phage DNA
B. Inability of replicative enzymes
C. Immediate synthesis of capsid
D. Lytic cycle inefficiency