MDCAT XI Biology Accelular Life / The Virus Online Test-2

587

Created on June 24, 2025 By

📚 Test Details

Subject: Biology
Class: 1st year / XI
Chapter Name: Accelular Life / The Virus
Test: 2
Book: Sindh Textbook
Total No. Of MCQs: 50 MCQs
Time Allowed: 50 Minutes

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1 / 50

1. Which of the following characteristics listed below does not support the classification of viruses as non-living entities, based on their behavior outside a host organism and structural features typically associated with inanimate particles?

a) Inactive for infinite time

b) They can crystallize and store

c) They interact genetically and physiologically with the host

d) None

2 / 50

2. In the early 20th century, efforts to isolate and identify disease-causing agents led to the crystallization of the Tobacco Mosaic Virus (TMV). Who among the following scientists is credited with this discovery, which provided significant evidence that viruses could behave like chemical substances?

a) Stanley

b) Martinus Beijerinck

c) Chamberlane

d) Pasteur

3 / 50

3. Match the virus classification criteria (Column A) with their corresponding descriptions or examples (Column B), and determine which set collectively reflects the most comprehensive basis for viral classification as obligate parasites.

Column A	Column B
A. Host range	1. DNA or RNA, single- or double-stranded
B. Genetic material	2. Plant, animal, or bacterial target cells
C. Capsid structure	3. Helical, icosahedral, or complex symmetry
D. Mode of replication	4. Lytic or lysogenic cycle dependency

a) A-2, B-1, C-3, D-4

b) A-1, B-2, C-3, D-4

c) A-2, B-3, C-1, D-4

d) A-3, B-4, C-2, D-1

4 / 50

4. RNA viruses are highly diverse in their genomic structure. Which group listed below is known to consist of more than 2000 different types of RNA genomes, making it particularly significant for the study of plant virology and host-pathogen interactions?

a) Phytophage

b) Zoophage

c) Bacteriophage

d) All

5 / 50

5. What is the shape of the capsid of adenovirus?

a) Helical

b) Polyhedron

c) Tadpole

d) Spherical

6 / 50

6. David Baltimore classified viruses into how many groups based on genomic constitution?

a) Six

b) Eight

c) Eleven

d) Seven

7 / 50

7. Which of the following is an example of an ssDNA virus?

a) Herpes

b) Corona

c) C virus

d) Parvovirus

8 / 50

8. Which of the following is not an example of a positive-sense ssRNA virus?

a) Corona

b) Dengue

c) C virus

d) Reo virus

9 / 50

9. Paramyxovirus is an example of:

a) Negative-sense ssRNA virus

b) Negative-sense dsRNA virus

c) Positive-sense ssDNA virus

d) Positive-sense dsDNA virus

10 / 50

10. How do viruses evade the host cell's immune system?

a) Degrading host cell genome

b) Deactivating the complement system

c) Blocking interferon response

d) Inactivation of MHC

e) All

11 / 50

11. Generally, temperatures __ and above are sufficient to inactivate most viruses, though some viruses find protection in their surroundings.

a) 70°

b) 60°

c) 100°

d) 0°

12 / 50

12. Virus growth and survival can be influenced by various environmental factors such as:

a) Temperature

b) Moisture

c) Mucous

d) All

13 / 50

13. Which of the following statements is correct?

a) Non-lipid enveloped viruses are more vulnerable than lipid-enveloped

b) Non-enveloped viruses survive at 20–30% humidity

c) Enveloped viruses can tolerate and survive longer at 70–90% humidity

d) All

e) None

14 / 50

14. The favorable pH for virus survival is approximately:

a) 8

b) 5.5

c) 6.5

d) 7.2

15 / 50

15. Each capsomere of TMV contains approximately:

a) 150 amino acids

b) 158 amino acids

c) 168 amino acids

d) 130 amino acids

16 / 50

16. Lysosomes break the bacterial wall and release approximately how many phages?

a) 100–200

b) 200–300

c) 100–300

d) Hundreds to thousands

17 / 50

17. Which of the following regarding bacteriophages is correct?

a) Used in genetic engineering

b) Used to treat bacterial infections

c) Used to present antigens

d) All

18 / 50

18. The size of HIV is approximately:

a) 60 times greater than RBC

b) 60 times greater than WBC

c) 60 times smaller than RBC

d) 50 times smaller than RBC

19 / 50

19. Which of the following drugs are found effective against HIV?

a) Rukobia

b) Descovy

c) Truvada

d) All

20 / 50

20. Vaccination in AIDS aims to prevent:

a) HIV

b) Opportunistic infections

c) Bacterial diseases

d) Fungal diseases

21 / 50

21. The virus transmitted through the whitefly pest is:

a) Polio

b) Herpes

c) Hepatitis

d) begomovirus

22 / 50

22. Prion molecules are composed of 29 amino acids and contain a single:

a) Hydrogen bond

b) Ionic bond

c) Disulphide bond

d) Sulphide bond

23 / 50

23. Prions cause:

a) Trisomy 21

b) Alzheimer's disease

c) Insomnia

d) All

24 / 50

24. How many tail fibers are attached to the end plate of a bacteriophage?

a) 4

b) 8

c) 6

d) 3

25 / 50

25. The adhesion properties of viruses are determined by:

a) Proteins that make up their coat and envelope

b) Genomes that they contain

c) RNA genome that they contain

d) DNA genome that they contain

26 / 50

26. Measles and mumps in humans are caused by:

a) Paramyxovirus

b) Herpes virus

c) Parvovirus

d) Rhinovirus

27 / 50

27. Chemically, viruses are composed of:

a) Nucleic acid only

b) Protein only

c) Both nucleic acid and protein

d) Carbohydrates and protein

28 / 50

28. The third step in the lytic cycle is:

a) Phage attachment

b) Genome penetration

c) Biosynthesis

d) Maturation

29 / 50

29. The subunits of a capsid are called:

a) Capsomeres

b) Centromere

c) Peptone

d) Amino acids

30 / 50

30. There is no genetic vaccine available for:

a) HAV

b) HBV

c) HCV

d) HIV

31 / 50

31. Rhinovirus is responsible for:

a) Cough

b) Allergy

c) Flu

d) Measles

32 / 50

32. The major target of HIV is which of the following cells?

a) B cells

b) T lymphocytes

c) WBC

d) All

33 / 50

33. A virion is a:

a) Complete virus

b) Have capsid

c) Contains Genome

d) All are correct

34 / 50

34. Virus replication may not occur in:

a) Blood plasma

b) Animal cell

c) Plant cell

d) Fungal cell

35 / 50

35. A virus is an:

a) Endoparasite

b) Obligate parasite

c) Ectoparasite

d) Facultative parasite

36 / 50

36. The two RNA molecules of HIV are somewhat coiled and coded with how many genes?

a) Thousands

b) Hundreds

c) Nine

d) Two

37 / 50

37. What is the genetic material of a virus?

a) DNA

b) RNA

c) Either DNA or RNA

d) Both DNA and RNA

38 / 50

38. What is the function of the viral capsid?

a) To replicate viral genetic material

b) To protect the viral genome

c) To synthesize viral proteins

d) To release viral particles

39 / 50

39. Consider the following virological observations:

i. The virus evades immune detection by incorporating host-derived glycoproteins into its envelope.

ii. It uses membrane fusion to enter host cells.

iii. It is vulnerable to detergents, desiccation, and heat due to its structural composition.

Based on these characteristics, which type of virus is being described?

a) Enveloped virus

b) Non-enveloped virus

c) Icosahedral virus

d) Naked DNA virus

40 / 50

40. Hepatitis B is an example of:

a) DNA virus

b) ssDNA virus

c) dsRNA virus

d) dsDNA virus

41 / 50

41. Which viral structure is composed of lipids and proteins?

a) Capsid

b) Envelope

c) Nucleocapsid

d) Genome

42 / 50

42. In which condition is the major symptom is paralysis of the lower limbs, accompanied by fever and sore throat.

a) Poliomyelitis

b) AIDS

c) Hepatitis

d) Influenza

43 / 50

43. Which of the following is an enveloped virus?

a) Poliovirus

b) Rhinovirus

c) Ebola virus

d) Adenovirus

44 / 50

44. Viroids:

a) Are enveloped

b) Transmitted by pollen and seeds

c) Synthesize new RNA from host genome

d) All of these

45 / 50

45. Which of the following is a living characteristic of viruses?

a) Mutation

b) Respiration

c) Excretion

d) Movement

46 / 50

46. The word "virus" is derived from the __ word meaning __.

a) Latin ,colloid

b) Greek, poison

c) Latin, poison or slimy liquid

d) Greek, slimy liquid

47 / 50

47.

Which of the following is a key characteristic that distinguishes viruses from bacteria?

a) Viruses are always larger than bacteria.

b) Viruses can reproduce independently outside a host.

c) Viruses lack cellular structure and require a host to replicate.

d) Viruses contain DNA or RNA as their genetic material.

48 / 50

48. Which of the following components is not found in all viruses?

a) Genetic material

b) Capsid

c) Envelope

d) Protein

49 / 50

49. Which of these processes is not carried out by viruses?

a) Replication of genetic material

b) Protein synthesis

c) Mutation

d) ATP production

50 / 50

50.

The protein coat of a virus is called:

a) Envelope

b) Capsid

c) Core

d) Matrix

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MDCAT XI Biology Accelular Life / The Virus Online Test-2

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