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

AIDS

Mumps

Dengue

Influenza

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

GP120

Integrase

Reverse transcriptase

Capsid

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

It weakens the immune system

It is curable with antibiotics

It only affects the liver

It is caused by a bacterium

4. Why are antibiotics ineffective against viruses?

Viruses live only in water

Viruses grow too fast

Viruses are immune to drugs

Viruses are not living and lack targets like cell walls

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

Cell wall

Membrane

Envelope

Capsid

6. What makes viruses different from bacteria?

They have mitochondria

They require a host cell to reproduce

They are prokaryotes

They reproduce independently

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

Aid in host cell recognition and entry

Store energy

Protect the capsid

Replicate the genome

8. What is the shape of the influenza virus?

Complex

Icosahedral

Tadpole

Helical

9. How do viruses reproduce?

By budding

By binary fission

By using the host cell machinery

By mitosis

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

Capsid

Ribosomes

Protein coat

Nucleic acid

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

Forms viral capsid

Synthesizes viral proteins

Converts viral RNA to DNA

Breaks down host DNA

12. Which disease is caused by a retrovirus?

Influenza

Hepatitis A

Dengue

AIDS

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

Single-stranded RNA

Single-stranded DNA

Double-stranded RNA

Double-stranded DNA

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

HCV

HIV

HSV

HPV

15. Which of the following is a DNA virus?

Poliovirus

Influenza virus

HIV

Hepatitis B virus

16. Why is HIV called a retrovirus?

It uses host ribosomes

It has a double capsid

It replicates backward from RNA to DNA

It uses a DNA genome

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

Liver cells

Neurons

T-helper cells

Red blood cells

18. Which of the following methods cannot destroy viruses?

UV radiation

Antibiotics

Disinfectants

High heat

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

Protein coat

Cell membrane

Ribosomes

Nucleic acid

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

Several months to years

1–2 weeks

Immediate onset

1–2 days

21. Which enzyme is unique to retroviruses like HIV?

Ligase

DNA polymerase

Reverse transcriptase

RNA polymerase

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

Polio

Mumps

Rabies

Hepatitis B

23. The term "acellular" refers to:

Cells that divide quickly

Viruses lacking cellular structure

Viruses having many cells

Cells with large nuclei

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

By the cytoplasm

By the cell wall

By mitochondria

By the capsid

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

They are not considered living organisms

They are too small

They are prokaryotes

They do not contain DNA

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26. Which statement about viruses is true?

They are cellular organisms

They require a host cell for replication

They reproduce on their own

They have both DNA and RNA

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

Capsid

Capsule

Envelope

Nucleoid

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

Single-stranded DNA

Double-stranded RNA

Double-stranded DNA

Single-stranded RNA

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

HIV/AIDS

Hepatitis A

Influenza

Measles

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

Rabies virus

Poliovirus

Dengue virus

HPV

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

Fungi only

Bacteria

Humans

Plants

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

Ligase

RNA polymerase

Integrase

Helicase

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

Only RNA in double-stranded form

Always circular DNA

Can be DNA or RNA, single or double-stranded

Always double-stranded DNA

34. What is the first step in viral infection?

DNA replication

Release of virions

Attachment to host cell

Translation

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

Nucleic acid

DNA or RNA

Capsid

Lipid envelope

36. Which of the following best describes viral replication?

Mitosis in host cell

Using host machinery to replicate

Independent binary fission

Reproduction in the nucleus

37. AIDS is characterized by:

High white blood cell count

Enlarged red blood cells

Weak immune system and opportunistic infections

Excessive energy production

38. What is a provirus?

A non-infectious form of virus

A virus that infects only animals

A plant virus

Viral DNA integrated into host DNA

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

DNA ligase

Reverse transcriptase

GP120 glycoprotein

RNA polymerase

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

Strong immune response

Persistent fever

Frequent infections

Sudden weight loss

41. What is the shape of the T4 bacteriophage?

Icosahedral

Spherical

Tadpole-shaped

Helical

42. Which virus has both DNA and an envelope?

Poliovirus

Influenza virus

Hepatitis B virus

Rabies virus

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

Rabies

Influenza

Tuberculosis

Measles

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

Shape and symmetry

Ribosome content

Type of nucleic acid

Host organism

45. What makes a virus host-specific?

Presence of ribosomes

Length of capsid

Type of nucleic acid

Compatibility of surface receptors

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

Neutrophils

B-cells

Red blood cells

T-helper cells (CD4+)

47. Which type of virus infects bacteria?

Retrovirus

Adenovirus

Bacteriophage

Oncovirus

48. How is HIV transmitted?

Unprotected sexual contact

Casual contact

Mosquito bites

Coughing or sneezing

49. Viruses are considered non-living because:

They cause diseases

They reproduce quickly

They have RNA

They do not grow or carry out metabolism

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

Vaginal fluid

Blood

Saliva

Semen

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Mustansar KhanLast Updated: October 14, 2025

Biology Acellular life Online Mcqs Test

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