Biology Acellular life Online Mcqs Test

Mustansar KhanLast Updated: October 14, 2025

Important Biology Acellular life Question and Answer

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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Acellular life Practice Test Online With Explanation

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Page 1 of 2

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

By the capsid

By the cytoplasm

By the cell wall

By mitochondria

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

Saliva

Semen

Blood

Vaginal fluid

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

HIV

HCV

HSV

HPV

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

Plants

Fungi only

Bacteria

Humans

5. Which enzyme is unique to retroviruses like HIV?

RNA polymerase

Ligase

DNA polymerase

Reverse transcriptase

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

Store energy

Replicate the genome

Aid in host cell recognition and entry

Protect the capsid

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

Tuberculosis

Influenza

Measles

Rabies

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

Hepatitis A

HIV/AIDS

Measles

Influenza

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

Host organism

Type of nucleic acid

Ribosome content

Shape and symmetry

10. Viruses are considered non-living because:

They reproduce quickly

They cause diseases

They do not grow or carry out metabolism

They have RNA

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

B-cells

Red blood cells

Neutrophils

T-helper cells (CD4+)

12. Which type of virus infects bacteria?

Oncovirus

Adenovirus

Retrovirus

Bacteriophage

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

Integrase

Capsid

Reverse transcriptase

GP120

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

Persistent fever

Frequent infections

Strong immune response

Sudden weight loss

15. What is the shape of the influenza virus?

Tadpole

Complex

Helical

Icosahedral

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

Single-stranded RNA

Double-stranded DNA

Single-stranded DNA

Double-stranded RNA

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

Capsid

Ribosomes

Nucleic acid

Protein coat

18. What makes viruses different from bacteria?

They have mitochondria

They require a host cell to reproduce

They reproduce independently

They are prokaryotes

19. What is the shape of the T4 bacteriophage?

Tadpole-shaped

Spherical

Helical

Icosahedral

20. How do viruses reproduce?

By budding

By binary fission

By mitosis

By using the host cell machinery

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

Capsid

Envelope

Nucleoid

Capsule

22. Why is HIV called a retrovirus?

It uses host ribosomes

It replicates backward from RNA to DNA

It has a double capsid

It uses a DNA genome

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

T-helper cells

Neurons

Liver cells

Red blood cells

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

Polio

Rabies

Mumps

Hepatitis B

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

They are not considered living organisms

They are too small

They do not contain DNA

They are prokaryotes

Page 2 of 2

26. Which of the following is a DNA virus?

Hepatitis B virus

HIV

Influenza virus

Poliovirus

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

Envelope

Cell wall

Membrane

Capsid

28. Which of the following best describes viral replication?

Reproduction in the nucleus

Mitosis in host cell

Independent binary fission

Using host machinery to replicate

29. Which disease is caused by a retrovirus?

AIDS

Hepatitis A

Dengue

Influenza

30. What is the first step in viral infection?

Translation

DNA replication

Release of virions

Attachment to host cell

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

Dengue virus

HPV

Rabies virus

Poliovirus

32. What is a provirus?

A plant virus

A non-infectious form of virus

A virus that infects only animals

Viral DNA integrated into host DNA

33. Which statement about viruses is true?

They reproduce on their own

They require a host cell for replication

They have both DNA and RNA

They are cellular organisms

34. What makes a virus host-specific?

Type of nucleic acid

Presence of ribosomes

Compatibility of surface receptors

Length of capsid

35. Which of the following methods cannot destroy viruses?

UV radiation

Disinfectants

High heat

Antibiotics

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

Lipid envelope

Capsid

DNA or RNA

Nucleic acid

37. Why are antibiotics ineffective against viruses?

Viruses are immune to drugs

Viruses are not living and lack targets like cell walls

Viruses live only in water

Viruses grow too fast

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

Always double-stranded DNA

Can be DNA or RNA, single or double-stranded

Only RNA in double-stranded form

Always circular DNA

39. How is HIV transmitted?

Unprotected sexual contact

Mosquito bites

Coughing or sneezing

Casual contact

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

DNA ligase

RNA polymerase

GP120 glycoprotein

Reverse transcriptase

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

Influenza

Dengue

Mumps

AIDS

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

RNA polymerase

Ligase

Integrase

Helicase

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

Double-stranded DNA

Double-stranded RNA

Single-stranded RNA

Single-stranded DNA

44. Which virus has both DNA and an envelope?

Hepatitis B virus

Poliovirus

Influenza virus

Rabies virus

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

Nucleic acid

Cell membrane

Protein coat

Ribosomes

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

It only affects the liver

It is curable with antibiotics

It weakens the immune system

It is caused by a bacterium

47. AIDS is characterized by:

Excessive energy production

Weak immune system and opportunistic infections

High white blood cell count

Enlarged red blood cells

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

1–2 days

Several months to years

1–2 weeks

Immediate onset

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

Synthesizes viral proteins

Forms viral capsid

Breaks down host DNA

Converts viral RNA to DNA

50. The term "acellular" refers to:

Cells that divide quickly

Viruses having many cells

Cells with large nuclei

Viruses lacking cellular structure

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Mustansar KhanLast Updated: October 14, 2025

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