XI Biology Acellular Life Or Virus Test Mdcat-2024

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Test Details:

Subject: Biology
Class: 1st year or 11
Chapter name: Acellular Life or Virus
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 50 Minutes
Price : Free

574

Created on June 03, 2024 By

medicoengineer.com

XI Biology Acellular life or Virus Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. What distinguishes viruses from living organisms?

a) They rely on host cells for replication

b) They undergo mutations that alter their functionality

c) Their genome has structural importance

d) All of the above

2 / 50

2. What is the basis of David Baltimore's classification of viruses?

a) Morphology

b) Genome constitution

c) Pathogenicity

d) Host range

3 / 50

3. Which type of virus has deoxyribonucleic acid (DNA) as their genome?

a) Single-stranded RNA viruses

b) Double-stranded RNA viruses

c) DNA viruses

d) B and C

4 / 50

4. Which of the following is an example of a double-stranded DNA virus?

a) Parvoviruses

b) Reoviruses

c) Corona virusCorona virus

d) Herpes virus

5 / 50

5. Which virus is classified as a single-stranded RNA virus with a DNA intermediate?

a) Corona virus

b) HIV

c) Herpes virus

d) Hepatitis B virus

6 / 50

6. What process do reverse transcribing viruses use to form DNA from RNA?

a) Translation

b) Transcription

c) Reverse transcription

d) Replication

7 / 50

7. Which virus is an example of a Positive sense single-stranded RNA virus?

a) HIV

b) Dengue virus

c) Hepatitis B virus

d) Parvovirus

8 / 50

8. Match the Column:

A) Parvovirus	i) Infect bacteria
B) Bacteriophage	ii) infect plants
C) Hepititis-B	iii) Double-stranded DNA virus with RNA Intermediate
D) Phytopages	iv) Single-stranded DNA virus

a) A=i , B=iv , C=iii , D=ii

b) A=ii , B=I , C=iii , D=i

c) A=iv , B=i , C=iii D=ii

d) A=iv , B=iii, C=i D=ii

9 / 50

9. Function of Reverse Transcriptase enzyme is:

a) Convert Single stranded RNA into Double Stranded RNA

b) Convert Double Stranded DNA into Single Stranded

c) Convert RNA into DNA

d) Convert DNA into RNA

10 / 50

10. Tick the incorrect statement :

a) Virus is an acellular

b) Virus can contain both RNA and DNA

c) Virus needs a Host cell to complete its life cycle

d) Viruses are intracellular obligate parasite

11 / 50

11. Which of the following accurately describes the genome type and typical capsid shape of phytophages?

a) DNA genome; spherical capsid

b) RNA genome; rod-shaped capsid

c) DNA or RNA genome; spherical capsid

d) RNA genome; head and tail structure

12 / 50

12. Which type of virus is characterized by having double-stranded DNA as its genome and a head and tail structure?

a) Phytophage

b) Zoophage

c) Bacteriophage

d) Plant virus

13 / 50

13. Considering the host specificity, which type of virus includes the examples TMW and CaMV, and what are their typical genomic and structural characteristics?

a) Phytophage; RNA genome; rod-shaped capsid

b) Zoophage; DNA genome; spherical shape

c) Bacteriophage; DNA genome; head and tail

d) Phytophage; DNA genome; spherical shape

14 / 50

14. Tick the correct statement regarding the structure of viruses:

a) The outer coat, also known as the capsid, is made up of lipid molecules arranged in a helical structure.

b) The inner core of the virus typically contains the genome, which can be either DNA or RNA, single-stranded or double-stranded

c) The glycolipids layer that sometimes covers the capsid is derived from the viral genome itself and lacks any host cell components.

d) Capsomeres, which form the capsid, are identical lipid units specific to a particular kind of virus.

15 / 50

15. Match the following components of a virus with their correct description:

1.Capsid

2.Capsomeres

3.Envelope

4.Genome

a. Identical protein units specific to a virus type

b. Outer covering made of protein

c. Genetic material that may be DNA or RNA

d. Lipoprotein layer which helps to recognize host cell

a) 1-b, 2-a, 3-d, 4-c

b) 1-a, 2-b, 3-d, 4-c

c) 1-b, 2-a, 3-c, 4-d

d) 1-a, 2-b, 3-c, 4-d

16 / 50

16. Which of the following statements correctly describes the structural arrangement of capsomeres?

a) In icosahedral viruses, capsomeres are arranged in a hollow coil, forming a rod shape.

b) Helical viruses have capsomeres arranged in 20 triangles to form a polyhedron or spherical shape

c) In helical viruses, capsomeres are arranged in a hollow coil, which gives the virus a rod shape.

d) Icosahedral viruses have capsomeres randomly distributed over the surface of the capsid.

17 / 50

17. Viruses can be classified on the basis of:

a) Host

b) Genome

c) shape

d) All of these

18 / 50

18. Function of Endonuclease is :

a) repair entire DNA molecules

b) Cleave phosphodiester bonds at internal sites in a nucleotide sequence hence degrade the DNA or RNA

c) Add nucleotides to the 3' end of a growing DNA strand.

d) Remove RNA primers and replace them with DNA during replication

19 / 50

19. Complement System is:

a) Is part of Adaptive Immunity

b) It comprises of Plasma Proteins

c) Activated upon Detection of Pathogens

d) Viruses Blocks the Complement Proteins

e) All are correct except A

20 / 50

20. Drugs and vaccines becomes less effective for Viruses because:

a) Because viruses destroy the drugs

b) Because viruses leave the host cell

c) Drugs can only affect bacteria can never affect viruses

d) Viruses can mutate and change their genomic constitution

21 / 50

21. Tick the correct statement:

I. Coronavirus and influenza are examples of Enveloped Viruses

II. Coronavirus and influenza are examples of non-enveloped viruses and

III. Enveloped virus can survive at higher levels of Humidity than non-enveloped

IV. non-enveloped virus can survive at higher levels of Humidity than Enveloped

a) II and IV

b) I and IV

c) II, III and IV

d) I, III and IV

22 / 50

22. Label the Diagram:

ghj

a) Head=A ; Sheath=B; Collar=C

b) Head=A ; Collar=B ; Sheath=C

c) Collar=A; Head=B ; Sheath=C

d) Sheath=A; Head=B; Collar=C

23 / 50

23. In bacteriophage tail fibers usually are _____ in number.

a) 6

b) 5

c) 3

d) 9

24 / 50

24. What does the acronym AIDS stand for?

a) Auto Immune Deficiency Syndrome

b) Acquired Immune Deficiency Syndrome

c) Acute Immune Deficiency Syndrome

d) Acquired Infection Deficiency Syndrome

25 / 50

25. In bacteriophage Adsorption apparatus located _______and functions as________.

a) Distal end and recognizes host cell receptors

b) Proximal End and recognizes host cell receptors

c) It is not present in Bacteriophage

d) Both A and B

26 / 50

26. Which of the following pairs correctly matches a virus to its capsid shape?

a) CaMV - Polyhedral

b) HIV – circular

c) TMV - Enveloped

d) Bacteriophage – circular

27 / 50

27. During the penetration stage of bacteriophage, what remains outside the bacterium and is referred to as the "ghost"?

a) Phage DNA

b) Contractile tail sheath

c) Hollow tube

d) Phage head and remaining components

28 / 50

28. In the maturation stage, what begins to form as a result of the assembly of synthesized components?

a) New bacterial cells

b) New phages

c) Lytic enzymes

d) Phage ghosts

29 / 50

29. What enzyme is released by newly formed bacteriophages to cause lysis of the bacterial wall?

a) DNA polymerase

b) Lysozyme

c) Protease

d) RNAase

30 / 50

30. How many phage progeny are typically released into the surrounding environment after the lysis of a bacterial cell?

a) 10-20

b) 20-50

c) 50-100

d) 100-200

31 / 50

31. Which statement accurately describes the maturation stage of the bacteriophage lytic cycle?

a) Phage DNA is injected into the bacterial cell.

b) Phage heads, tails, and tail fibers are assembled

c) The bacterial wall is lysed.

d) Phage proteins are synthesized.

32 / 50

32. What does the bacteriophage virus form when its genome joins with the host bacterial nucleic acid in the lysogenic cycle?

a) Prophage

b) Virion

c) Capsid

d) Lysozyme

33 / 50

33. In the lysogenic cycle, what is the fate of the bacterial cell while the prophage is integrated into its genome?

a) The bacterial cell is lysed

b) The bacterial cell multiplies normally

c) The bacterial cell stops dividing.

d) The bacterial cell produces new phages.

34 / 50

34. Which of the following statements accurately describe the differences between the lytic and lysogenic cycles of bacteriophages?

The lytic cycle results in the immediate destruction of the host cell, whereas the lysogenic cycle allows the host cell to continue living and dividing.
In the lysogenic cycle, the viral DNA integrates into the host genome as a prophage, but in the lytic cycle, the viral DNA remains separate and does not integrate.
The lysogenic cycle produces new phage particles immediately, leading to host cell lysis, whereas the lytic cycle delays phage production until environmental triggers activate the prophage.
The lytic cycle is characterized by the dormant state of the phage within the host genome, while the lysogenic cycle actively uses the host cell's machinery to produce new phages.

a) 1 and 2

b) 1 and 3

c) 2 and 4

d) 3 and 4

35 / 50

35. Correct statements about HIV:

Its 60 times greater than a RBC
It Belongs to Group of Retroviruses
Helical in shape
Total 9 genes

a) 1, 2 and 4

b) 1 and 3

c) 2 and 4

d) 2,3 and 4

36 / 50

36. Tick the incorrect statement:

a) Enzyme Reverse transcriptase makes DNA from RNA

b) HIV is an enveloped virus

c) Enzyme Integrase helps HIV to destroy its DNA

d) HIV stands for Human Immuno-deficiency Virus

37 / 50

37. What is a provirus?

a) A type of bacteriophage that infects bacteria

b) A viral genome that is integrated into the DNA of a host cell

c) A viral particle outside of a host cell

d) A virus that causes immediate cell lysis

38 / 50

38. Tick the correct statements :

HIV targets the Helper T-cells
Helper T-cells are part of innate immunity
Helper T-cells helps to activate Cytotxic cells, B-lymphocytes (B-cells) and macrophages
Helper T-cells act as activator of immune response

a) 1,2 and 3

b) 1,3 and 4

c) 2 ,3 and 4

d) All are correct

39 / 50

39. HIV targets T-cells because:

a) T-cells can easily be destroyed

b) T-cells have chemotaxis material that attracts HIV

c) T-cells have specific receptors which are recognized and identified by HIV

d) T-cells have similar structure to HIV

40 / 50

40. Which is incorrect about AIDS:

a) Antiretroviral Therapy (ART) is used to treat AIDS

b) AIDS can be detected by Blood/saliva sample

c) AIDS can’t spread from placenta of mother to child

d) Sexual contact can transmit virus

41 / 50

41. What is correct about AIDS:

a) There is no vaccine but it is a curable disease

b) There is a vaccine but it is not a curable disease

c) There is a vaccine and also it is a curable disease

d) There is no vaccine and it is not a curable disease

42 / 50

42. Tick the correct statement about the Dengue Virus:

The Aedes Mosquito is a Vector of the Dengue Virus
It is a positive sense Single stranded Virus
It can be transmitted by Blood

a) 1 and 2

b) 2 and 3

c) 1,2 and 3

d) 1 and 3

43 / 50

43. . Tick the correct virus according to below information:

Vector: Bats
Type: RNA virus
Transmission: Airborne Droplets
It affects: The pulmonary system

a) HIV

b) Corona Virus

c) Dengue Virus

d) Hepatitis-C

44 / 50

44. Favorable pH for viral survival is:

a) 5.0 to 5.5

b) around 6.5

c) 7.2 to 8

d) pH have no effect on viral survival

45 / 50

45. Which Statement describes the Temperature and viral survival relationship:

a) At high temperature Proteins becomes more stable

b) In High temp: RNA viruses have more endurance than DNA virus up-to certain limits

c) Generally Temperature greater than 60° C can stable the virus

d) None of Above is correct

46 / 50

46. The major symptom/s in Poliomyelitis are/is:

a) Paralysis of upper limbs

b) Paralysis of lower limbs

c) Fever and sore throat

d) None of these

47 / 50

47. Which Of the following is not a viral disease?

a) Herpes

b) Poliomyelitis

c) Hepatitis

d) HIV

48 / 50

48. Tick the correct sequence of steps involved in Lytic cycle of Bacteriophage.

a) Phage attachment→Genome penetration→ Replication Phage DNA→Maturation→Lysis and release of Phage viruses

b) Phage attachment→ Replication Phage DNA→Maturation → Genome penetration→Lysis and release of Phage viruses

c) Phage attachment → Replication Phage DNA→Genome penetration →Maturation→Lysis and release of Phage viruses

d) Phage attachment→ Maturation→Genome penetration→ Replication Phage DNA→ Lysis and release of Phage viruses

49 / 50

49. Regarding Prions and Viroids, tick the correct Statement/s:

These both are called Subviral particles
Prions are infectious proteins comprised of 29 Amino acids and 29 Disulfide bonds
Prions may cause Mad Cow disease in cattle while viroids can cause plant diseases
There is no evidence of human disease caused by viroids

a) 1 and 4

b) 1, 3 ,and 4

c) 1 and 2

d) 1 , 2 and 4

50 / 50

50. Hepatitis is________and____________are types of Hepatitis.

a) Inflammation of Liver ; Hep-A , Hep-C , Hep-K and Hep-E

b) Inflammation of Kidney ; Hep-A , Hep-C , Hep-K and Hep-E

c) Inflammation of Liver ; Hep-A , Hep-B , Hep-C , Hep-D and Hep-E

d) Inflammation of Kidney ; Hep-A , Hep-B , Hep-C , Hep-D and Hep-E

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