Q. No.Yeast is unique amongst the members of Kingdom Fungi because it:
1. reproduces by ascospores
2. is unicellular
3. does not have a chitinous cell wall
4. does not have a sexual mode of reproduction
Subtopic: Kingdom Fungi: Ascomycetes | Kingdom Fungi: Basidomycetes | Mycorrhiza | Virus, Viroids & Prions |
88%
From NCERT
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A fungus used extensively in biochemical and genetic work is:
| 1. | Neurospora | 2. | Trichoderma |
| 3. | Paecilomyces | 4. | Streptomyces |
Subtopic: Kingdom Fungi: Ascomycetes | Kingdom Fungi: Basidomycetes | Mycorrhiza | Virus, Viroids & Prions |
93%
From NCERT
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Viruses are not considered truly ‘living’, if we understand living as those organisms that:
| 1. | have an inert crystalline structure outside the living cell. |
| 2. | once infect a cell, take over the machinery of the host cell to replicate themselves. |
| 3. | have a cell structure. |
| 4. | have double stranded DNA as their genetic material. |
Subtopic: Virus, Viroids & Prions |
58%
From NCERT
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Which of the following would best describe a virus?
| 1. | Non cellular organization, crystalline inert structure in a living cell |
| 2. | Non cellular organization, crystalline inert structure outside a living cell |
| 3. | Cellular organization, crystalline inert structure in a living cell |
| 4. | Cellular organization, crystalline inert structure outside a living cell |
Subtopic: Virus, Viroids & Prions |
82%
From NCERT
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Consider the two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | Viruses are obligate cellular endoparasites. |
| Statement II: | Once they infect a cell they take over the machinery of the host cell to replicate themselves, killing the host. |
2. Statement I is correct; Statement II is incorrect
3. Statement I is incorrect; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Virus, Viroids & Prions |
65%
From NCERT
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Contagium vivum fluidum was proposed by
| 1. | D. J. Ivanowsky | 2. | M. W. Beijerinek |
| 3. | Stanley | 4. | Robert Hooke |
Subtopic: Virus, Viroids & Prions |
79%
From NCERT
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Name the scientist:
| I. | He studied the tobacco mosaic virus. |
| II. | He succeeded in extracting the virus in the form of pure crystals in 1935. |
| III. | He was able to show that the tobacco mosaic virus is composed of protein and RNA. |
| 1. | D. J. Ivanovsky | 2. | W. M. Stanley |
| 3. | M. W. Beijerinck | 4. | Louis Pasteur |
Subtopic: Virus, Viroids & Prions |
66%
From NCERT
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Match Scientists in Column I with their contribution in the field of virology given in Column II and select your answer from the codes given below:
Codes:
| Column I | Column II | ||
| A | D. J. Ivanowsky | a | Recognized tobacco mosaic is caused by microbes smaller than bacteria |
| B | M. W. Beijerinck | b | Demonstrated extract of infected tobacco plants could cause infection in healthy plants |
| C | W. M. Stanley | c | Showed that viruses could be crystallized |
Codes:
| A | B | C | |
| 1. | a | b | c |
| 2. | a | c | b |
| 3. | b | a | c |
| 4. | c | b | a |
Subtopic: Virus, Viroids & Prions |
72%
From NCERT
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How many of the given statements regarding viruses are correct?
| I: | No virus contains both RNA and DNA. |
| II: | A virus is a nucleoprotein and the genetic material is infectious. |
| III: | In general, viruses that infect plants have single stranded RNA. |
| IV: | Bacterial viruses or bacteriophages (viruses that infect the bacteria) are usually double stranded DNA viruses. |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Virus, Viroids & Prions |
78%
From NCERT
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In general, the viruses that infect plants have:
| 1. | Single stranded RNA | 2. | Single stranded DNA |
| 3. | Double stranded RNA | 4. | Double stranded DNA |
Subtopic: Virus, Viroids & Prions |
83%
From NCERT
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