Virus and Viroids

Viroids have

Interferons are –

Genetic material of TMV is:

The tail part of a bacteriophage is a narrow cylindrical part that contains a hollow tube inside it which helps it to inject the DNA into the host. 

The head of the bacteriophage has a protein coat called capsid which encloses a highly folded double-stranded DNA.

Bacteriophages are the viruses that infect the bacteria.

Name the following.

The Virus that has single-stranded RNA and lacks a protein coat.

Identify the correct statement/s about viruses.

Assertion (A): DNA from Bacteriophage head passes through tail core through plasma membrane and enters bacterial cell.

Reason (R): Plasma membrane of the host cell gets dissolved due to lysozyme and releases the new virions.

Assertion (A): Enveloped viruses like measles, Rubella and Adenovirus attached to the susceptible host by spikes.

Reason $\left(\mathrm{R}\right):$ Influenza virus is an enveloped virus attached to susceptible host by spikes.

The infectious diseases which are emerging include

I. Severe Acute Respiratory Syndrome

II. Dengue Fever

III. Mad Cow Disease

IV. Tuberculosis

The correct combination is:

In the Bacteriophage the arrangement of its parts (Top to bottom) are as follow:

I. Head containing $\mathrm{DNA}$
II.  Sheath
III. Collar
IV. Tail fibres
V. Base plate

The correct sequence is:

Arrange the following steps in the order of their occurance in the lytic cycle of a phage.
i) Maturation phase
ii) Penetration phase
iii) Attachment
iv) Release phase
v) Biosynthesis
The correct combination is

Which among the following is incorrect with respect to virus?

Mycophages are

On the basis of host attacked, types of viruses are

What are bacteriophages? Describe how they are used as vectors.