1- Viruses can be classified to DNA and RNA viruses according to their …………..
a- Morphology.
b- Physical properties.
c- Biological properties.
d- Genome.

2- The affinity of certain virus to certain tissue is referred as to …………………….
a- Attraction.
b- Tropism.
c- Specialty.
d- None of the above.

3- Asymptomatic viral infections are known as ……………….
a- Latent infection.
b- Chronic infection.
c- Acute infection.
d- None of the above.

4- …………… is the yield (numbers) of new viruses from a viral infected cell.
a- Productivity.
b- Infectivity.
c- Burst size.
d- Release size.

5- During viral replication cycle the step of macromolecular synthesis includes ……..
a- Synthesis of regulatory enzymes.
b- Viral genome replication.
c- Synthesis of structural proteins.
d- All the above.

6- During viral replication cycle the release of naked viruses takes place through ………….
a- Cell lysis.
b- Budding.
c- Translocation.
d- Fusion.

7- The first step of viral replication cycle is ……………….
a- Release.
b- Maturation.
c- Recognition.
d- Penetration.

8- …………. take place when the initial site of viral infection is the main site of viral replication.
a- Systemic infection.
b- Localized infection.
c- Central infection.
d- Partial infection.

9- Incubation period of viral localized infection is ………. than (to) its of systemic one.
a- Longer.
b- Shorter.
c- Similar.
d- Slightly longer.
10- Viral latent infection usually takes place in ……………..
a- Actively dividing cells.
b- Non-dividing cells.
c- Neurons.
d- B and C.

11- During viral replication cycle there is (are) ………… translation process(es).
a- 1.
b- 2.
c- 3.
d- 4.

12- According to viral genomes the abbreviation ssRNA is stands for ………………
a- Straight Strip of Replicated Nucleic Acid.
b- Short Strand of Ribonucleic Acid.
c- Single Strand of Ribonucleic Acid.
d- Safe Strip of Replicated Nucleic acid.

13- Viral particles without envelope are known as …………………
a- Covered viruses.
b- Naked Viruses.
c- Coated Viruses.
d- Embedded Viruses.

14- Viral target cell is known as ………………
a- Parent cell.
b- Host cell.
c- Accepted cell.
d- Incubating cell.

15- Baltimore system classified viruses into ……………… groups.
a- 5.
b- 6.
c- 7.
d- 12.

16. Gene expresion means :
a. information flow from gene to protein
b. polymer of RNA
c. agremation of proten
d. substution of gene

17. Virus pathogenesis is :
a. ability of virus to produce a disease
b. virus replication
c. virus metabolic
d. virus shape

18. Molcular identification include
a. polymerase chain reaction ( PCR )
b. DNA polymerase
c. DNA fingerprinting
d. all above true




19. Indirect diagnosis of virus include
a. Enzyme immuno assay (ELISA )
b. shadow technique astaining
c. Microscopically
d. no correct answer

20. The names of viruses may reflect the follwing
a. size
b. place of discover
c. disease cause
d. all above true

21. General character of viruses is
a. contain only DNA or RNA
b. contain a nuclei
c. see with nicked eye
d. contain flagella

22. Detection of viruses size can be by the follwing methods
a. electronic microscopy
b. ultra-filtration
c. Gram stain
d. A and B are true

23. RNA viruses are …
a. single strand
b. double strand
c. triple strand
d. no correct answer.

24. Functions of viruses nucleic acid are..
a. carries the genetic information
b. control all the virus characters
c. carries the genetic codes for proteins
d. all above true.

25. The viruses mode of transmission ..
a. injection
b. Inhalation
c. by mosquito
d. a & b are true.

26. Factor which control virus pathogenesis are
a. virus virulence virus factor
b. virus M.W
c. metabolic and nutrational status
d. A and C are true

27. These are different uses of DNA probe except
a. diagnostic of infections disease
b. use use in differentiall diagnosis
c. classification factor
d. used for expharation of genetic structure


28. In PCR ……………specific primers must be used:
a. Two.
b. Three.
c. Four.
d. Non of the above.

29. All the followings are post amplification (Detection) methods except:
a. Dot Blot Hybridization.
b. Agar gel electrophoresis.
c. ELIZA.
d. Southern Blot Hybridization.

30. Primers typically consist of:
a. 10-20 bases.
b. 20-30 bases.
c. 50-70 bases.
d. 100-200 bases.