VIRUSES-ASSIGNMENT

1	The following field of biology is mainly based on the discoveries in Virology Molecular Biology Biochemistry Genetic Engineering Microbiology Ans:Genetic Engineering
2	The incorrect statement with respect to viruses is Viruses reproduce independently Viruses undergo mutations Viruses show simplicity in structure Viruses do not respond to external stimuli Ans:Viruses reproduce independently
3	[A]: Viruses live as obligate parasites [R]: They do not have ribosomes and stable cytoplasmic environment in them Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:Both A and R are true and R is the correct explanation of A
4	Match the following A - IV, B - V, C - II, D - I A - IV, B - III, C - V, D - I A - V, B - IV, C - I, D - II A - IV, B - III, C - V, D - II 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 All All except II III and I I and IV Ans:All except II
6	First crystallized Virus was Bacteriophage Phytophage Zymophage Mycophage Ans:Phytophage
7	The smallest virus is Rod shaped Tadpole shaped Polyhedral Bullet shaped Ans:Tadpole shaped
8	Match the following A - V, B - IV, C - II, D - I A - IV, B - V, C - I, D - II A - V, B - IV, C - II, D - III A - V, B - III, C - IV, D - I Ans:A - V, B - IV, C - II, D - I
9	Presence of Peplos is usual feature of Zoophages Phytophages Zymophages Mycophages Ans:Zoophages
10	Lipids, Proteins, Carbohydrates and RNA are present in TMV Bacteriophage 6 Influenza virus Adeno virus Ans:Influenza virus
11	Match the following A - IV, B - V, C - II, D - III A - V, B - IV, C - III, D - I A - IV, B - V, C - II, D - I A - IV, B - III, C - I, D - II Ans:A - IV, B - V, C - II, D - I
12	Study the following table and choose the correct combination I and II I and III All except IV III and IV Ans:I and III
13	If the capsomers are arranged in icasohedron symmetry, the virus attains the following shape Rod Bullet Polyhedral Spherical Ans:Polyhedral
14	[A]: First crystallized Virus was TMV [R]: TMV was first crystallized by Franklin. Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true Ans:Both A and R are true but R is not the correct explanation of A
15	The molecular weight of TMV particle is 39 X 106 36 X 106 36 X 109 39 X 109 Ans:39 X 106
16	Match the following with respect to TMV particle A- IV, B - V, C - II, D - III A- V, B - IV, C - I, D - II A- IV, B - I, C - V, D - II A- IV, B - I, C - V, D - III Ans:A- IV, B - I, C - V, D - III
17	The diameter of central hole of TMV particle is 40 nm 4 Ao 40 Ao 4μ Ans:40 Ao
18	Bacteriophages were first discovered by Fraenkel Schramm Twort Felix d’ Herelle Ans:Twort
19	Hexagonal structures of Bacteriophage I. Cap of Head II. Head in cross section III. End plate IV. Collar I and IV only II and III All except IV All except I 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 II, IV, I, III II, I, IV, III I, II, IV, III II, IV, III, I Ans:II, I, IV, III
21	Ghost formation is seen in the following stage of Lytic cycle of Bacteriophage Adsorption Penetration Eclipse Period Maturation period Ans:Penetration
22	Eclipse period is 1st half of latent period 2nd half of Penetration period 2nd half of latent period 1st half of Penetration stage Ans:1st half of latent period
23	Match the following A - III, B - IV, C - V, D - II A - III, B - V, C - IV, D - II A - IV, B - III, C - I, D - V A - III, B - IV, C - V, D - I Ans:A - III, B - IV, C - V, D - II
24	Study the following table with respect to T4 Bacteriophage and choose the correct combination All All except III All except II I, II, III 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 Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true 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 I and II II, III I, II, III I, III Ans:I, II, III
27	The organs of the plant that usually show the symptoms of viral diseases are Stem Buds Flowers Leaves Ans:Leaves
28	The most common symptom of Viral disease is Abnormal growth Subnormal growth Degradation of chlorophyll Necrosis Ans:Degradation of chlorophyll
29	Study the following with respect to Viruses and choose the correct match A - V, B - III, C - IV, D - II A - III, B - IV, C - V, D - II A - IV, B - V, C - II, D - III A - V, B - IV, C - III, D - I 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 Chlorosis Mosaic Vein clearing Vein Banding Ans:Vein Banding
31	This is Farmers friendly viral disease of Plants Tomato spotted wilt Rice Stunting Tulip Mosaic Break Citrus vein banding 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 II and III III and IV All except II All except I Ans:All except I
33	Choose the incorrect statement Most of the viruses are transmitted through Insects Transmission of a particular virus differs from plant to plant Transmission of plant virus varies from virus to virus A virus which is parasitic on a plant can not survive in animal body 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 I and III II and I III and IV II and IV Ans:III and IV
35	Match the following with respect to Viruses A - IV, B - III, C - I, D - II A - V, B - IV, C - II, D - I A - IV, B - III, C - II, D - I A - IV, B - III, C - V, D - II 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 Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A A is true but R is false A is false but R is true 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 Tobacco Necrosis Virus Cherry ring spot Virus Bean Mosaic Virus Potato Virus Ans:Cherry ring spot Virus
38	Choose the non-virecidal substance. Cytovirin - 2 Thiouracil Malachite Green Calcium sulphate Ans:Calcium sulphate
39	The best way of controlling viral diseases of Plants is Prophylaxis Chemotherapy Usage of Insecticides Breeding disease resistant varieties Ans:Breeding disease resistant varieties
40	Xephenema is the following type of virus vector Insect Fungus Angiosperm Nematode Ans:Nematode