Viruses, Viroids, Prions and Lichens

Assertion: Lichen is especially found on rock, bark or poor soil all over the world.

Reason: They can withstand the extremes in temperatures.

Algae and fungi exhibit symbiosis in _____ (lichen/virus).

Which of the following exhibits symbiosis?

Lichen exhibits symbiosis.

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.

Leaf extract from an infected plant was passed through a filter with a pore size of $0.05\mu \mathrm{m}$ diameter. The infectious agent was detected in the filtrate. Which ONE of the following is the likely infectious agent?

The genome of $\mathrm{SARS}-\mathrm{CoV}2$ is composed of

Creutzfeldt Jakob Disease $\left(\mathrm{CJD}\right)$ is a transmissible disease caused by a

Which one of the following statements is true 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.

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:

Match the following lists:

List - I		List - II
(A)		(I)	Lambda phage
(B)		(II)	$\mathrm{TMV}$
(C)		(III)	Adenovirus
(D)		(IV)	$\mathrm{HIV}$
		(V)	Bacteriophage

The correct match is

Choose the incorrect statements.
A. The TMV is with a molecular weight of $49\times {10}^6$ Daltons and $2130$ protein subunits.
B. The number of capsomers is the characteristics of each type of virus.
C. Conrat confirmed that the genetic material of a virus is RNA.
D. The burst size is referred to the number of newly synthesised phage particles released by a single host cell.

Match the following:

Which among the following is incorrect with respect to virus?

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