Sunday, March 18, 2012

VIRUSES-ASSIGNMENT

1 The following field of biology is mainly based on the discoveries in Virology




Ans:Genetic Engineering
2 The incorrect statement with respect to viruses is




Ans:Viruses reproduce independently
3 [A]: Viruses live as obligate parasites
[R]: They do not have ribosomes and stable cytoplasmic environment in them





Ans:Both A and R are true and R is the correct explanation of A
4 Match the following





Ans:A - IV, B - III, C - V, D - II
5 The techniques commonly used in Virology are
I. Electron Microscopy
II. Light Micrcoscopy
III. X-ray crystallography
IV. Ultracentrifugation





Ans:All except II
6 First crystallized Virus was




Ans:Phytophage
7 The smallest virus is




Ans:Tadpole shaped
8 Match the following





Ans:A - V, B - IV, C - II, D - I
9 Presence of Peplos is usual feature of




Ans:Zoophages
10 Lipids, Proteins, Carbohydrates and RNA are present in




Ans:Influenza virus
11 Match the following





Ans:A - IV, B - V, C - II, D - I
12 Study the following table and choose the correct combination





Ans:I and III
13 If the capsomers are arranged in icasohedron symmetry, the virus attains the following shape




Ans:Polyhedral
14 [A]: First crystallized Virus was TMV
[R]: TMV was first crystallized by Franklin.





Ans:Both A and R are true but R is not the correct explanation of A
15 The molecular weight of TMV particle is




Ans:39 X 106
16 Match the following with respect to TMV particle





Ans:A- IV, B - I, C - V, D - III
17 The diameter of central hole of TMV particle is




Ans:40 Ao
18 Bacteriophages were first discovered by




Ans:Twort
19 Hexagonal structures of Bacteriophage
I. Cap of Head
II. Head in cross section
III. End plate
IV. Collar





Ans:All except IV
20 Arrange the role of following structures of T4 bacteriophage during its replication
I. Lysozyme
II. Tail fibres
III. DNA
IV. Tail sheath





Ans:II, I, IV, III
21 Ghost formation is seen in the following stage of Lytic cycle of Bacteriophage




Ans:Penetration
22 Eclipse period is




Ans:1st half of latent period
23 Match the following





Ans:A - III, B - IV, C - V, D - II
24 Study the following table with respect to T4 Bacteriophage and choose the correct combination





Ans:I, II, III
25 [A]: During Lytic cycle only DNA of bacteriophage enters into host cell
[R]: Tail fibres of bacteriophage are formed in bacterial cell





Ans:Both A and R are true but R is not the correct explanation of A
26 These are 6 in number in a bacteriophage.
I. Tail Pins
II. Tail fibres
III. Capsomers in every ring of Tail sheath





Ans:I, II, III
27 The organs of the plant that usually show the symptoms of viral diseases are




Ans:Leaves
28 The most common symptom of Viral disease is




Ans:Degradation of chlorophyll
29 Study the following with respect to Viruses and choose the correct match





Ans:A - V, B - III, C - IV, D - II
30 In a virus infected plant, except along the veins the leaf becomes chloretic. The disease is described as




Ans:Vein Banding
31 This is Farmers friendly viral disease of Plants




Ans:Tulip Mosaic Break
32 Yellowing of leaf is neither limited to vein regions nor non-vein regions of the leaf in the following viral diseases.
I. Vein Banding
II. Ring spots
III. Mosaic
IV. Chlorosis





Ans:All except I
33 Choose the incorrect statement




Ans:A virus which is parasitic on a plant can not survive in animal body
34 These are vectors for soil borne viral diseases
I. Insects
II. Parasitic Phanerogams
III. Nematodes
IV. Fungi





Ans:III and IV
35 Match the following with respect to Viruses





Ans:A - IV, B - III, C - II, D - I
36 [A]: Quarantine is a prophylactic measure
[R]: Entry of viral vectors into a new area can not be prevented by Quarantine





Ans:A is true but R is false
37 Host spores are involved in transmission of the following virus from one plant to other plant host




Ans:Cherry ring spot Virus
38 Choose the non-virecidal substance.




Ans:Calcium sulphate
39 The best way of controlling viral diseases of Plants is




Ans:Breeding disease resistant varieties
40 Xephenema is the following type of virus vector




Ans:Nematode

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Asthra