Bacteriophage

Q.

What are the advantages and disadvantages of a virus?

Q. Baculoviruses are used as biological control agents that
attacks

1. Both A and C
2. Other arthropods
3. Mammals
4. Insects

Q. The most extensively used bacteria in genetic engineering is

1. Escherichia
2. Salmonella
3. Clostridium
4. Bacillus

Q. What are Cry genes? In which organism are they present? [1]

Q. Which is incorrect about the Nucleopolyhedrovirus (NPV)?

1. These are species-specific.
2. They aid in an overall IPM programme or when an ecologically sensitive area is being treated.
   
3. These are broad-spectrum.
   
4. They have no negative impact on plants, mammals, bird, fish and non-target insects.
   

Q. Genetic material of T2 phage is

1. linear ds DNA
2. circular ds DNA
3. linear ss RNA
4. circular ssRNA

Q. A person with sickle cell anemia is

1. more prone to typhoid
2. more prone to malaria
3. less prone to malaria
4. less prone to typhoid
   

Q. In genetic engineering antibiotic resistance genes are used

1. for keeping cultures free of infection
2. as selectable markers
3. as sequences where replication starts
4. to select healthy vectors

Q. The majority of Baculoviruses are used as biological control agents as

1. All of the above
   
2. Beneficial insects are being conserved
3. They have no negative impact on non-targets
   
4. They are species-specific

Q. Which of the following is neither a prokaryote nor a eukaryote?

1. Bacteriophage
2. Bacteria
3. Protozoan
4. Fungi

Q. Which can be used as a vector for transfer of DNA segments?
(a) Bacterium
(b) Plasmid
(c) Plasmodium
(d) Bacteriophage

1. a, b and d
2. b and d
3. a and c
4. a only

Q. Bt endotoxin that exists as inactive protoxin is converted into active toxin once bollworm ingests it due to

1. activity of protease enzyme in gut
2. high metabolic activity in gut
3. acidic pH in gut
4. alkaline pH in gut

Q. Identify the correct sequence of events in the viral replication process
I. Eclipse II. Maturation III. Adsorption
IV. Assembly V. Penetration VI. Lysis

1. III, V, I, II, IV, VI
2. III, V, VI, IV, II, I
3. I, II, III, IV, V, VI
4. II, I, III, IV, V, VI

Q. Genetic material of T2 phage is

1. linear ds DNA
2. circular ds DNA
3. linear ss RNA
4. circular ssRNA

Q.

What exactly is a Phage?

Q. What for Nucleopolyhydro viruses are being used now a days?

Q. The choice of the Bt-toxin genes depends upon the

1. Type of the crop
2. Type of targeted pest
3. The type of vector
4. Both A and B

Q. The given image is a

1. virus infecting plants
2. virus infecting animals
3. virus infecting bacteria
4. virus infecting humans

Q. Who performed the popular "Replica Plating Experiment" :-

1. Nirenberg and Kornberg
2. Kornberg and Lederberg
3. Joshua Lederberg and Esther Lederberg
4. Holley, Khorana and Mathai

Q. The bacterium Bacillus thuringiensis is widely used in contemporary biology as

1. Indicator of water pollution
2. Source of industrial enzyme
3. Insecticide
4. Agent for production of dairy products

Q. What would happen when one grows a recombinant bacterium in a bioreactor but forgets to add an antibiotic to the medium in which the recombinant is growing?

Q.

Given below is the diagram of a bacteriophage.

Select the option that correctly identifies a, b, c and d

1. (a) - Collar, (b) - Tail fibres, (c) - Head, (d) - Sheath
2. (a) - Tail fibres, (b) - Head, (c) - Sheath, (d) - Collar
3. (a) - Sheath, (b) - Collar, (c) - Head, (d) - Tail fibres
4. (a) - Head, (b) - Sheath, (c) - Collar, (d) - Tail fibres

Q. The given image is a

1. virus infecting plants
2. virus infecting bacteria
3. virus infecting animals
4. virus infecting humans

Q.

Are phages alive?

Q.

Is bacteria a cell?

Q. Which of the antibiotics is not produced by one of the Monera $\left(Streptomyces\right)$?

1. Erythromycin
2. Penicillin
3. Streptomycin
4. Terramycin

Q. Identify the correct sequence of events in the viral replication process
I. Eclipse II. Maturation III. Adsorption
IV. Assembly V. Penetration VI. Lysis

1. I, II, III, IV, V, VI
2. II, I, III, IV, V, VI
3. III, V, I, II, IV, VI
4. III, V, VI, IV, II, I

Q. Genetic material of T2 phage is

1. circular ssRNA
2. linear ss RNA
3. circular ds DNA
4. linear ds DNA

Q. Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because

1. Bacteria encloses toxin in a special sac
2. Toxin is immature
3. Toxin is inactive
4. Bacteria are resistant to the toxin

Q.

Do eubacteria have a nucleus?