Viruses

Q.

Which of the following statements is incorrect about viroid, viruses, or prions?

1. Viroids lack a protein coat

2. Viruses are obligate parasites

3. The infective constituent in viruses is the protein coat

4. Prions consist of abnormally folded proteins

Q. Match the following columns and select the correct option:

	Column-I		Column-II
(a)	Dragonflies	(i)	Biocontrol agents of several plant pathogens
(b)	Bacillus thuringiensis	(ii)	Get rid of aphids and mosquitoes
(c)	Glomus	(iii)	Narrow spectrum insecticidal applications
(d)	Baculoviruses	(iv)	Biocontrol agents of lepidopteran plant pests
		(v)	Absorb phosphorus from soil

1. (a)-(iii), (b)-(v), (c)-(iv), (d)-(i)
2. (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
3. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(v)
4. (a)-(ii), (b)-(iv), (c)-(v), (d)-(iii)

Q.

In RNAi, genes are silenced using

1. ssDNA

2. ssRNA

3. dsDNA

4. dsRNA

Q. The genetic material that is present in viruses is

1. only RNA
2. only DNA
3. either RNA or DNA
4. both DNA and RNA

Q.

Organise a discussion in your class on the topic- Are viruses living or non-living?

Q. Which of the following statements is not correct for viruses?

1. Viruses are obligate parasites
2. Viruses cannot pass through bacterial filters
3. Viruses are made up of protein and DNA or RNA (never both DNA and RNA)
4. Viruses can multiply only when they are inside the living cells

Q. Which viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications?

1. Riboviruses
2. Papilomaviruses
3. Baculoviruses
4. Adenoviruses

Q.

Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.

Q.

A virus is considered as a living organism and an obligate parasite when inside a host cell. But virus is not classified along with bacteria or fungi. What are the characters of virus that are similar to non-living objects?

Q. M.W. Beijerinck used the term ‘Contagium vivum fluidum’ to describe

1. prions
2. viruses
3. viroids
4. bacteria

Q. Difference between Virus and Viroid is

1. none of the above
2. both a and b
3. presence of low molecular weight RNA in virus but absent in viroid
4. absence of protein coat in viroid but present in virus

Q. Choose the incorrect statement about Baculoviruses.

1. They are species specific.
2. They have broad spectrum insecticidal applications.
3. No negative impact on plants and animals.
4. They aid in integrated pest management programme.

Q. The causative agent of mad-cow disease is:

1. Prion
2. Worm
3. Bacterium
4. Virus

Q. How do cytokine barriers provide innate immunity in humans ? [1]

Q.

What are Interferons ?

Q.

Name any two animal diseases and two plant diseases caused by micro-organisms.

Q.

What kingdom is virus?

Q. Why protist are better termed as Acellular?

Q.

In plants, mosaic formation, leaf rolling and curling, yellowing of plant parts, vein clearing, dwarfing and stunted growth, necrosis etc. are the symptoms of

1. Bacterial diseases

2. Mycoplasmal diseases

3. Viral diseases

4. Fungal diseases

Q.

What is Oscillatoria?

Q. Hershey and Chase experiment proving DNA as the genetic material was based on the principle

1. Transduction
2. transformation
3. transcription
4. translation

Q. Which of the following pairs has an infectious and a non-infectious disease respectively?

1. Typhoid and AIDS
2. AIDS and cancer
3. Pneumonia and malaria
4. Cancer and AIDS

Q.

Which of these bacteria lack cell wall (shape)?

1. Sphaerotilus

2. Caulobacter

3. Rhodomicrobium

4. Mycoplasma

Q.

Question 9

Difference between virus and viroid is

(a) absence of protein coat in viroid, but present in virus.

(b) presence of low molecular weight RNA in virus, but absent in viroid,

(c) Both (a) and (b)

(d) None of the above

Q. What are interferons? How do interferons check infection of new cells?

Q. From the given tables, which one of the following options is true for m-RNA, t-RNA and r-RNA?

1. m-RNA	t-RNA	r-RNA
   Highly stable	Soluble RNA	Act as an enzyme

2. m-RNA	t-RNA	r-RNA
   Adapter RNA	Largest RNA	Single stranded

3. m-RNA	t-RNA	r-RNA
   Have message for protein	Adapter RNA	Play catalytic role

4. m-RNA	t-RNA	r-RNA
   Soluble RNA	Highly stable	Double stranded

Q. Biological control agent is obtained from

1. $Agrobacteriumtumefaciens$
2. $E.coli$
3. $Meloidogyneincognita$
4. $Bacillusthuringiensis$

Q. Of the following diseases given below, how many of them are caused by viruses?
Mumps, Smallpox, Herpes, Citrus canker, Red rot of sugarcane, Tobacco mosaic

1. Six
2. Four
3. Five
4. Two

Q. In vector pBR322, the ‘rop’ codes for:

1. Pvu II
2. Pvu I
3. Proteins that involved in the replication of the restriction enzyme
4. Proteins that involved in the replication of the plasmid

Q.

Which of these has a double closed type of circulatory system?

1. Cockroach, fish

2. Fish, frog

3. Earthworm, humans

4. Bird, human