Biology Acellular life Online Mcqs Test

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Question 1

1. Viruses are considered non-living because:

Answer

They have RNA

Answer

They cause diseases

Answer

They do not grow or carry out metabolism

Answer

They reproduce quickly

Question 2

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

Answer

Cell membrane

Answer

Protein coat

Answer

Nucleic acid

Question 3

3. What makes a virus host-specific?

Answer

Compatibility of surface receptors

Answer

Length of capsid

Answer

Presence of ribosomes

Answer

Type of nucleic acid

Question 4

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

Answer

Lipid envelope

Answer

DNA or RNA

Answer

Nucleic acid

Question 5

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

Answer

Reverse transcriptase

Answer

DNA ligase

Answer

GP120 glycoprotein

Answer

RNA polymerase

Question 6

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

Answer

Fungi only

Question 7

7. How is HIV transmitted?

Answer

Coughing or sneezing

Answer

Casual contact

Answer

Unprotected sexual contact

Answer

Mosquito bites

Question 8

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

Answer

They do not contain DNA

Answer

They are not considered living organisms

Answer

They are too small

Answer

They are prokaryotes

Question 9

9. Which statement about viruses is true?

Answer

They have both DNA and RNA

Answer

They are cellular organisms

Answer

They reproduce on their own

Answer

They require a host cell for replication

Question 10

10. Why are antibiotics ineffective against viruses?

Answer

Viruses are not living and lack targets like cell walls

Answer

Viruses grow too fast

Answer

Viruses are immune to drugs

Answer

Viruses live only in water

Question 11

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

Answer

Vaginal fluid

Question 12

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

Question 13

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

Answer

Sudden weight loss

Answer

Frequent infections

Answer

Strong immune response

Answer

Persistent fever

Question 14

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

Answer

Neutrophils

Answer

T-helper cells (CD4+)

Answer

Red blood cells

Question 15

15. How do viruses reproduce?

Answer

By binary fission

Answer

By mitosis

Answer

By using the host cell machinery

Answer

By budding

Question 16

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

Answer

Tuberculosis

Question 17

17. What is a provirus?

Answer

Viral DNA integrated into host DNA

Answer

A non-infectious form of virus

Answer

A virus that infects only animals

Answer

A plant virus

Question 18

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

Answer

Rabies virus

Answer

Poliovirus

Answer

Dengue virus

Question 19

19. What makes viruses different from bacteria?

Answer

They are prokaryotes

Answer

They have mitochondria

Answer

They require a host cell to reproduce

Answer

They reproduce independently

Question 20

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

Answer

Single-stranded DNA

Answer

Single-stranded RNA

Answer

Double-stranded DNA

Answer

Double-stranded RNA

Question 21

21. Which virus has both DNA and an envelope?

Answer

Poliovirus

Answer

Influenza virus

Answer

Hepatitis B virus

Answer

Rabies virus

Question 22

22. Which of the following best describes viral replication?

Answer

Independent binary fission

Answer

Mitosis in host cell

Answer

Using host machinery to replicate

Answer

Reproduction in the nucleus

Question 23

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

Answer

By the cytoplasm

Answer

By the cell wall

Answer

By the capsid

Answer

By mitochondria

Question 24

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

Question 25

25. What is the shape of the T4 bacteriophage?

Answer

Icosahedral

Answer

Tadpole-shaped

Question 26

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

Answer

Replicate the genome

Answer

Protect the capsid

Answer

Aid in host cell recognition and entry

Answer

Store energy

Question 27

27. What is the shape of the influenza virus?

Answer

Icosahedral

Question 28

28. Which disease is caused by a retrovirus?

Answer

Hepatitis A

Question 29

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

Answer

Hepatitis B

Question 30

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

Question 31

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

Answer

RNA polymerase

Question 32

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

Answer

Protein coat

Answer

Nucleic acid

Question 33

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

Question 34

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

Answer

Hepatitis A

Question 35

35. Which enzyme is unique to retroviruses like HIV?

Answer

RNA polymerase

Answer

Reverse transcriptase

Answer

DNA polymerase

Question 36

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

Answer

Reverse transcriptase

Question 37

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

Answer

Always double-stranded DNA

Answer

Always circular DNA

Answer

Can be DNA or RNA, single or double-stranded

Answer

Only RNA in double-stranded form

Question 38

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

Answer

T-helper cells

Answer

Liver cells

Answer

Red blood cells

Question 39

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

Answer

It only affects the liver

Answer

It is curable with antibiotics

Answer

It is caused by a bacterium

Answer

It weakens the immune system

Question 40

40. Which of the following is a DNA virus?

Answer

Hepatitis B virus

Answer

Influenza virus

Answer

Poliovirus

Question 41

41. AIDS is characterized by:

Answer

Weak immune system and opportunistic infections

Answer

Excessive energy production

Answer

Enlarged red blood cells

Answer

High white blood cell count

Question 42

42. Which of the following methods cannot destroy viruses?

Answer

UV radiation

Answer

Disinfectants

Answer

Antibiotics

Question 43

43. The term "acellular" refers to:

Answer

Cells that divide quickly

Answer

Cells with large nuclei

Answer

Viruses having many cells

Answer

Viruses lacking cellular structure

Question 44

44. 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 45

45. Which type of virus infects bacteria?

Answer

Bacteriophage

Answer

Adenovirus

Answer

Retrovirus

Question 46

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

Answer

1–2 days

Answer

Immediate onset

Answer

Several months to years

Answer

1–2 weeks

Question 47

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

Answer

Shape and symmetry

Answer

Ribosome content

Answer

Type of nucleic acid

Answer

Host organism

Question 48

48. What is the first step in viral infection?

Answer

Attachment to host cell

Answer

DNA replication

Answer

Translation

Answer

Release of virions

Question 49

49. Why is HIV called a retrovirus?

Answer

It has a double capsid

Answer

It uses a DNA genome

Answer

It uses host ribosomes

Answer

It replicates backward from RNA to DNA

Question 50

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

Answer

Single-stranded RNA

Answer

Double-stranded DNA

Answer

Single-stranded DNA

Answer

Double-stranded RNA

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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