My Notes
Match the names of the scientists with contribution and choose your answer from the codes given below:
|
Scientists |
Contribution |
||
|
I. |
Beijerinck |
1. |
Gave the name ‘virus’ |
|
II. |
Luc Montagnier |
2. |
Gave the term ‘conragium vivum fluidum’ |
|
III. |
Pasteur |
3. |
Discovered bacteriophages |
|
IV. |
Twort |
4. |
Crystallized TMV |
|
V. |
Stanley |
5. |
Isolated HIV |
Codes:
|
I |
II |
III |
IV |
V |
|
|
(1) |
2 |
5 |
1 |
3 |
4 |
|
(2) |
2 |
3 |
1 |
5 |
4 |
|
(3) |
4 |
5 |
1 |
3 |
2 |
|
(4) |
4 |
3 |
1 |
5 |
2 |
Identify the incorrect statement:
| 1. | Virus has a protein coat called capsid made of small subunits called capsomeres. |
| 2. | The core has the genetic material - either RNA or DNA or both. |
| 3. | The capsomeres are arranged in helical or icosahedral forms. |
| 4. | Viruses can infect any type of organism. |
Match the 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:
| Column I | Column II | ||
| A. | Ivanowsky | a. | Recognized tobacco mosaic is caused by microbes smaller than bacteria |
| B. | Beijerinck | b. | Demonstrated extract of infected tobacco plants could cause infection in healthy plants |
| C. | 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. | b | a | d |
Viroids differ from viruses in having
(1) DNA molecules with protein coat
(2) DNA molecules without protein coat
(3) RNA molecules with protein coat
(4) RNA molecules without protein coat
Which of the following statements is wrong for viroids?
(1) They are smaller than viruses
(2) They cause infections
(3) Their RNA is of high molecular weight
(4) They lack a protein coat
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