Biology Acellular life Online Mcqs Test

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Question 1

1. Which of the following best describes viral replication?

Answer

Reproduction in the nucleus

Answer

Using host machinery to replicate

Answer

Independent binary fission

Answer

Mitosis in host cell

Question 2

2. Which component allows HIV to attach to host cells?

Answer

GP120 glycoprotein

Answer

RNA polymerase

Answer

Reverse transcriptase

Answer

DNA ligase

Question 3

3. Which part of the HIV virus binds to CD4 receptors on host cells?

Answer

Reverse transcriptase

Question 4

4. Which of the following correctly describes the genetic material in HIV?

Answer

Double-stranded RNA

Answer

Single-stranded RNA

Answer

Single-stranded DNA

Answer

Double-stranded DNA

Question 5

5. Which disease is caused by a virus with helical symmetry?

Answer

Hepatitis B

Question 6

6. Which of the following is a DNA virus?

Answer

Influenza virus

Answer

Hepatitis B virus

Answer

Poliovirus

Question 7

7. The protein shell that protects the viral genome is known as:

Question 8

8. Which of the following diseases is not caused by a virus?

Answer

Tuberculosis

Question 9

9. Which of the following methods cannot destroy viruses?

Answer

Disinfectants

Answer

UV radiation

Answer

Antibiotics

Question 10

10. Which enzyme helps HIV integrate its DNA into the host genome?

Answer

RNA polymerase

Question 11

11. Which disease is caused by a retrovirus?

Answer

Hepatitis A

Question 12

12. Which of the following cells does HIV primarily destroy?

Answer

Red blood cells

Answer

Neutrophils

Answer

T-helper cells (CD4+)

Question 13

13. Which enzyme is unique to retroviruses like HIV?

Answer

DNA polymerase

Answer

Reverse transcriptase

Answer

RNA polymerase

Question 14

14. Which feature is found only in viruses and not in bacteria?

Answer

Nucleic acid

Answer

Cell membrane

Answer

Protein coat

Question 15

15. Which of the following viruses is responsible for causing AIDS?

Question 16

16. How is HIV transmitted?

Answer

Mosquito bites

Answer

Coughing or sneezing

Answer

Unprotected sexual contact

Answer

Casual contact

Question 17

17. Viruses can be classified based on all of the following except:

Answer

Type of nucleic acid

Answer

Host organism

Answer

Shape and symmetry

Answer

Ribosome content

Question 18

18. What is the main function of a viral envelope?

Answer

Store energy

Answer

Aid in host cell recognition and entry

Answer

Replicate the genome

Answer

Protect the capsid

Question 19

19. What is the outer protein coat of a virus called?

Question 20

20. What is the shape of the influenza virus?

Answer

Icosahedral

Question 21

21. AIDS is characterized by:

Answer

High white blood cell count

Answer

Excessive energy production

Answer

Weak immune system and opportunistic infections

Answer

Enlarged red blood cells

Question 22

22. Which statement about viruses is true?

Answer

They have both DNA and RNA

Answer

They require a host cell for replication

Answer

They are cellular organisms

Answer

They reproduce on their own

Question 23

23. HIV primarily infects which cells of the human body?

Answer

Red blood cells

Answer

Liver cells

Answer

T-helper cells

Question 24

24. Which virus causes cancer-like conditions and is classified as an oncovirus?

Answer

Rabies virus

Answer

Poliovirus

Answer

Dengue virus

Question 25

25. Which virus has both DNA and an envelope?

Answer

Rabies virus

Answer

Hepatitis B virus

Answer

Influenza virus

Answer

Poliovirus

Question 26

26. Which of the following is not a host for viruses?

Answer

Fungi only

Question 27

27. Why are antibiotics ineffective against viruses?

Answer

Viruses live only in water

Answer

Viruses grow too fast

Answer

Viruses are not living and lack targets like cell walls

Answer

Viruses are immune to drugs

Question 28

28. Which of the following is NOT a symptom of AIDS?

Answer

Persistent fever

Answer

Sudden weight loss

Answer

Strong immune response

Answer

Frequent infections

Question 29

29. What type of nucleic acid is found in the Influenza virus?

Answer

Single-stranded RNA

Answer

Double-stranded RNA

Answer

Single-stranded DNA

Answer

Double-stranded DNA

Question 30

30. Which of the following structures is found in enveloped viruses but not in non-enveloped viruses?

Answer

DNA or RNA

Answer

Nucleic acid

Answer

Lipid envelope

Question 31

31. What is the first step in viral infection?

Answer

Translation

Answer

Attachment to host cell

Answer

DNA replication

Answer

Release of virions

Question 32

32. What is a provirus?

Answer

Viral DNA integrated into host DNA

Answer

A virus that infects only animals

Answer

A plant virus

Answer

A non-infectious form of virus

Question 33

33. Why can’t viruses be classified in the five-kingdom system?

Answer

They are prokaryotes

Answer

They do not contain DNA

Answer

They are not considered living organisms

Answer

They are too small

Question 34

34. What is the role of reverse transcriptase in HIV?

Answer

Breaks down host DNA

Answer

Synthesizes viral proteins

Answer

Forms viral capsid

Answer

Converts viral RNA to DNA

Question 35

35. Which of the following best describes the genome of a typical virus?

Answer

Only RNA in double-stranded form

Answer

Always circular DNA

Answer

Always double-stranded DNA

Answer

Can be DNA or RNA, single or double-stranded

Question 36

36. What is the shape of the T4 bacteriophage?

Answer

Tadpole-shaped

Answer

Icosahedral

Question 37

37. The term "acellular" refers to:

Answer

Viruses having many cells

Answer

Cells that divide quickly

Answer

Viruses lacking cellular structure

Answer

Cells with large nuclei

Question 38

38. Why is HIV called a retrovirus?

Answer

It uses host ribosomes

Answer

It uses a DNA genome

Answer

It replicates backward from RNA to DNA

Answer

It has a double capsid

Question 39

39. Which of the following structures is absent in all viruses?

Answer

Protein coat

Answer

Nucleic acid

Question 40

40. What is the incubation period of HIV before AIDS symptoms appear?

Answer

Immediate onset

Answer

Several months to years

Answer

1–2 days

Answer

1–2 weeks

Question 41

41. How is the genetic material of a virus protected?

Answer

By the capsid

Answer

By the cell wall

Answer

By the cytoplasm

Answer

By mitochondria

Question 42

42. Which of the following diseases is associated with a long latent period?

Question 43

43. Which of the following body fluids does not transmit HIV?

Answer

Vaginal fluid

Question 44

44. Which of the following viral diseases is sexually transmitted?

Answer

Hepatitis A

Question 45

45. Which of the following statements is correct about AIDS?

Answer

It is caused by a bacterium

Answer

It only affects the liver

Answer

It weakens the immune system

Answer

It is curable with antibiotics

Question 46

46. What makes a virus host-specific?

Answer

Type of nucleic acid

Answer

Compatibility of surface receptors

Answer

Presence of ribosomes

Answer

Length of capsid

Question 47

47. How do viruses reproduce?

Answer

By binary fission

Answer

By using the host cell machinery

Answer

By mitosis

Answer

By budding

Question 48

48. Which type of virus infects bacteria?

Answer

Adenovirus

Answer

Bacteriophage

Answer

Retrovirus

Question 49

49. What makes viruses different from bacteria?

Answer

They reproduce independently

Answer

They require a host cell to reproduce

Answer

They are prokaryotes

Answer

They have mitochondria

Question 50

50. Viruses are considered non-living because:

Answer

They do not grow or carry out metabolism

Answer

They have RNA

Answer

They reproduce quickly

Answer

They cause diseases

Question 51

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Total Questions:	50
Time Allowed:	25 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Important Biology Acellular life Question and Answer

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