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.
Test Helpful For:	MDCAT Entry Test Biology Online Test Interview Questions about Biology All Universities Entrance Test Recruitments Tests

Acellular life Practice Test Online With Explanation

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1. Which of the following methods cannot destroy viruses?

Antibiotics

UV radiation

Disinfectants

High heat

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

Red blood cells

T-helper cells (CD4+)

Neutrophils

B-cells

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

Rabies

Measles

Influenza

Tuberculosis

4. How do viruses reproduce?

By budding

By binary fission

By mitosis

By using the host cell machinery

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

Capsid

Integrase

Reverse transcriptase

GP120

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

Converts viral RNA to DNA

Synthesizes viral proteins

Breaks down host DNA

Forms viral capsid

7. What is the shape of the influenza virus?

Tadpole

Icosahedral

Helical

Complex

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

Single-stranded RNA

Single-stranded DNA

Double-stranded DNA

Double-stranded RNA

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

By the capsid

By the cytoplasm

By the cell wall

By mitochondria

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

Strong immune response

Persistent fever

Sudden weight loss

Frequent infections

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

Mumps

Influenza

AIDS

Dengue

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

They are prokaryotes

They are too small

They do not contain DNA

They are not considered living organisms

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

Store energy

Aid in host cell recognition and entry

Replicate the genome

Protect the capsid

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

HCV

HIV

HPV

HSV

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

Nucleic acid

Capsid

DNA or RNA

Lipid envelope

16. Which statement about viruses is true?

They have both DNA and RNA

They reproduce on their own

They are cellular organisms

They require a host cell for replication

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

Immediate onset

1–2 days

Several months to years

1–2 weeks

18. 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

19. Which of the following is a DNA virus?

Influenza virus

HIV

Poliovirus

Hepatitis B virus

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

Vaginal fluid

Semen

Saliva

Blood

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

Capsid

Envelope

Capsule

Nucleoid

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

T-helper cells

Neurons

Red blood cells

Liver cells

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

GP120 glycoprotein

RNA polymerase

DNA ligase

Reverse transcriptase

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

Hepatitis B

Mumps

Polio

Rabies

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

Bacteria

Plants

Fungi only

Humans

Page 2 of 2

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

Ligase

Helicase

Integrase

RNA polymerase

27. What is the first step in viral infection?

Release of virions

DNA replication

Attachment to host cell

Translation

28. 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

29. The term "acellular" refers to:

Viruses lacking cellular structure

Cells with large nuclei

Viruses having many cells

Cells that divide quickly

30. Which type of virus infects bacteria?

Adenovirus

Bacteriophage

Oncovirus

Retrovirus

31. AIDS is characterized by:

Weak immune system and opportunistic infections

High white blood cell count

Enlarged red blood cells

Excessive energy production

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

HPV

Dengue virus

Rabies virus

Poliovirus

33. What is the shape of the T4 bacteriophage?

Spherical

Tadpole-shaped

Helical

Icosahedral

34. What makes viruses different from bacteria?

They require a host cell to reproduce

They have mitochondria

They reproduce independently

They are prokaryotes

35. Which disease is caused by a retrovirus?

Hepatitis A

Influenza

AIDS

Dengue

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

It weakens the immune system

It only affects the liver

It is caused by a bacterium

It is curable with antibiotics

37. Which enzyme is unique to retroviruses like HIV?

DNA polymerase

RNA polymerase

Ligase

Reverse transcriptase

38. Why are antibiotics ineffective against viruses?

Viruses grow too fast

Viruses are immune to drugs

Viruses are not living and lack targets like cell walls

Viruses live only in water

39. Viruses are considered non-living because:

They cause diseases

They reproduce quickly

They have RNA

They do not grow or carry out metabolism

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

Protein coat

Ribosomes

Nucleic acid

Capsid

41. Which of the following best describes viral replication?

Reproduction in the nucleus

Using host machinery to replicate

Independent binary fission

Mitosis in host cell

42. What makes a virus host-specific?

Length of capsid

Presence of ribosomes

Compatibility of surface receptors

Type of nucleic acid

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

Envelope

Membrane

Capsid

Cell wall

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

Type of nucleic acid

Ribosome content

Host organism

Shape and symmetry

45. Which virus has both DNA and an envelope?

Influenza virus

Poliovirus

Hepatitis B virus

Rabies virus

46. How is HIV transmitted?

Unprotected sexual contact

Casual contact

Coughing or sneezing

Mosquito bites

47. Why is HIV called a retrovirus?

It has a double capsid

It uses host ribosomes

It replicates backward from RNA to DNA

It uses a DNA genome

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

Protein coat

Nucleic acid

Cell membrane

Ribosomes

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

HIV/AIDS

Influenza

Hepatitis A

Measles

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

Double-stranded DNA

Single-stranded DNA

Double-stranded RNA

Single-stranded RNA

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Mustansar KhanLast Updated: October 14, 2025

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