1. Which scientist demonstrated that viruses could be crystallized?
a. Dmitri Ivanowsky
b. M.W. Beijerinek
c. W.M. Stanley
d. T.O. Diener
2. What type of genetic material is found in viroids?
a. DNA
b. RNA
c. Protein
d. Lipids
3. What is the protein coat of a virus called?
a. Capsomere
b. Capsid
c. Mycobiont
d. Phycobiont
4. Which component of a lichen is autotrophic?
a. Mycobiont
b. Phycobiont
c. Capsid
d. Viroid
5. Who recognized certain microbes as the cause of mosaic disease in tobacco?
a. M.W. Beijerinek
b. W.M. Stanley
c. Dmitri Ivanowsky
d. T.O. Diener
6. What type of viruses typically infect bacteria?
a. Single-stranded RNA viruses
b. Double-stranded RNA viruses
c. Single-stranded DNA viruses
d. Double-stranded DNA viruses
7. Which disease is caused by a prion?
a. AIDS
b. Mad cow disease
c. Influenza
d. Smallpox
8. What characteristic is not associated with viruses?
a. Presence of a cell wall
b. Inert crystalline structure outside the host cell
c. Obligate parasites
d. Contains either RNA or DNA
9. What is the algal component of a lichen called?
a. Mycobiont
b. Capsid
c. Phycobiont
d. Viroid
10. Which scientist discovered viroids?
a. Dmitri Ivanowsky
b. M.W. Beijerinek
c. W.M. Stanley
d. T.O. Diener
11. Assertion (A): Viruses are considered non-cellular organisms.
Reason (R): They have an inert crystalline structure outside the living cell.
a. Both A and R are true, and R is the correct explanation of A.
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
12. Assertion (A): Lichens are good pollution indicators.
Reason (R): Lichens do not grow in polluted areas.
a. Both A and R are true, and R is the correct explanation of A.
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
13. Assertion (A): Prions are similar in size to viruses.
Reason (R): Prions consist of abnormally folded proteins.
a. Both A and R are true, and R is the correct explanation of A.
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
14. Assertion (A): Viroids have a protein coat.
Reason (R): Viroids are smaller than viruses.
a. Both A and R are true, and R is the correct explanation of A.
b. Both A and R are true, but R is not the correct explanation of A.
c. A is true, but R is false.
d. A is false, but R is true.
15. Match the following scientists with their discoveries:
|
Scientist |
Discovery
|
| a. Dmitri Iwanwosky
|
1. Viroids
|
|
b. T.O. Diener |
2. Mosaic disease in tobacco |
|
c. W.M. Stanley |
3. Crystallization of viruses |
|
d. M.W. Beijerinek |
4. Infectious living fluid (virus) |
a. a-2, b-1, c-3, d-4
b. a-3, b-4, c-2, d-1
c. a-4, b-3, c-1, d-2
d. a-2, b-1, c-4, d-3
Answers:
1. c. W.M. Stanley
2. b. RNA
3. b. Capsid
4. b. Phycobiont
5. c. Dmitri Ivanowsky
6. d. Double-stranded DNA viruses
7. b. Mad cow disease
8. a. Presence of a cell wall
9. c. Phycobiont
10. d. T.O. Diener
11. a. Both A and R are true, and R is the correct explanation of A.
12. a. Both A and R are true, and R is the correct explanation of A.
13. a. Both A and R are true, and R is the correct explanation of A.
14. d. A is false, but R is true.
15. a (a-2, b-1, c-3, d-4)
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