1. Viruses are considered acellular because they:
Answer: B. are not made of cells and have no cell machinery
Biology Class 11 Unit 5: Acellular Life MCQs
170 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 1 of 4.
Tap an option to check your answer.
2. The word "virus" is derived from a Latin word meaning:
Answer: C. poison (venom)
3. In 1884, who found that the causative agent of rabies could pass through a porcelain filter?
Answer: B. Charles Chamberland
4. Tobacco mosaic disease was shown to be caused by a filterable agent in 1892 by:
Answer: C. Iwanowsky
5. Who crystallized the tobacco mosaic virus in 1935?
Answer: D. W. M. Stanley
6. The study of viruses is called:
Answer: C. virology
7. Which of the following is a living characteristic of viruses?
Answer: C. They have genetic material (DNA or RNA) that can mutate
8. Which of the following is a non-living characteristic of viruses?
Answer: C. They can be crystallized and stored in bottles
9. Viruses are described as:
Answer: B. intracellular obligate parasites
10. A complete viral particle is called a:
Answer: C. virion
11. The core of a virion consists of:
Answer: B. viral genome and enzymes
12. The protective protein coat of a virus is the:
Answer: C. capsid
13. The capsid is made up of identical subunits called:
Answer: B. capsomeres
14. Herpes virus has how many capsomeres?
Answer: B. 162
15. The adenovirus capsid has how many capsomeres?
Answer: B. 252
16. A capsid with capsomeres arranged in 20 triangles is:
Answer: B. icosahedral
17. Tobacco mosaic virus has a:
Answer: B. helical (rod-shaped) capsid
18. Reverse transcriptase is found in:
Answer: C. retroviruses and hepatitis B virus
19. The enzyme reverse transcriptase converts:
Answer: C. RNA to DNA
20. The viral envelope is derived from the:
Answer: C. host cell membrane
21. Glycoprotein spikes on the viral envelope help the virus to:
Answer: B. recognize the host cell
22. The Baltimore classification places viruses into how many groups?
Answer: D. Seven
23. The Baltimore classification is based on:
Answer: C. mode of replication and genome type
24. A virus that attacks bacteria is a:
Answer: C. bacteriophage
25. Potato yellow dwarf virus is an example of:
Answer: B. plant virus
26. Rous sarcoma virus causes:
Answer: C. cancer in animals
27. Papovirus causes:
Answer: B. warts
28. Poxvirus causes:
Answer: C. smallpox
29. Picornavirus causes:
Answer: B. polio and hepatitis A
30. Paramyxovirus causes:
Answer: B. measles and mumps
31. Influenza virus is an example of:
Answer: C. enveloped virus
32. Adenoviruses have:
Answer: B. polyhedral capsid
33. A bacteriophage has a:
Answer: D. complex capsid
34. HIV is classified as:
Answer: D. ssRNA virus with template for DNA synthesis
35. Smallpox virus is a:
Answer: A. dsDNA virus
36. Viruses show host specificity because their surface proteins attach to specific:
Answer: B. receptors on the host cells
37. The polio virus can enter the cells of:
Answer: B. humans and other primates
38. Rabies virus can enter:
Answer: C. all mammalian cells
39. Hepatitis viruses infect:
Answer: C. liver cells
40. Poliovirus reproduces in:
Answer: C. spinal nerve cells
41. A virus must have a host cell because it lacks:
Answer: C. metabolic enzymes and ribosomes
42. The capsid protects the viral genome from:
Answer: B. nucleases of the host cell
43. Viruses survive outside the host as:
Answer: C. dormant or inactive particles
44. Outside the host, viruses are mainly threatened by changes in:
Answer: C. pH and temperature
45. Enveloped viruses survive outside the host for:
Answer: B. a shorter time than non-enveloped viruses
46. A bacteriophage is generally:
Answer: C. tadpole shaped
47. The head of a bacteriophage is:
Answer: B. icosahedral
48. The bacteriophage head contains:
Answer: B. a DNA genome
49. The tail of a bacteriophage is:
Answer: B. a hollow tube surrounded by a contractile sheath
50. The enzyme at the bottom of the phage tail core tube is:
Answer: C. lysozyme
About Biology Class 11 Unit 5 MCQs (Federal Board)
These 170 Biology MCQs cover Class 11 Unit 5: Acellular Life of the Federal Board (FBISE) HSSC-I (1st Year / Class 11) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 4 pages of 50. Use the Print button to save this chapter as a PDF.