MCQ on Viruses and Viroids with Answers Pdf
Virus MCQ with Answers Pdf for NEET :
Check your knowledge by solving MCQ on Viruses with answers Pdf. Below MCQs will help learners for preparing NEET examinations and will be able to score better as all the resources required to study of Viruses and Viroids are provided here. We tried to simplify the complexities of some of the topics in the form of Viruses multiple choice questions and answers so that preparation becomes easy for the NEET aspirants.
These MCQs are also useful for preparing for various competitive exams like KVPY, CET, NTSE, NET, SET. So, we are providing MCQ Questions on Viruses that will help you to understand the basic concepts of viruses and even help you get a good score with sufficient practice questions for each topic.
Read : NEET Biology Chapter wise Previous year Questions
Important Points to Remember about Viruses and Viroids :
- Virus is an ultra microscopic obligatory parasites which becomes active only inside a living cell or host cell.
- Viruses have either DNA or RNA as the genetic material. Viruses having RNA as the genetic material are known as retroviruses.
- Generally all viruses are made up of nucleoproteins (Nucleic acid + Protein). The nucleic acid may be DNA or RNA as genetic material. In a particular virus either DNA or RNA is the genetic material. Both are never present in a virus. Single stranded RNA or ss RNA – Tobacco mosaic virus (TMV)
- There is a protective covering of protein called capsid around the infective part. Capsid consists of small subunits called capsomeres and has antigenic property.
- All the viruses are obligate parasite i.e. they remain inert outside the host cell. They have ability to syntheize nucleic acids and proteins by using host cellular machinery (ribosomes, tRNAs, aminoacids, energy).
- Viroids, the smallest known pathogens, are naked, circular, single-stranded RNA molecules that do not encode protein but autonomously replicate when introduced into host plants. Viroids only infect plants; some cause economically important diseases of crop plants, while others appear to be benign.
Read : Biology MCQ Topic wise Pdf
Multiple Choice Questions on Viruses and Viroids :
1. Viroids differ from viruses in having_________
(1) DNA molecules without protein coat
(2) RNA molecules with protein coat
(3) RNA molecules without protein coat
(4) DNA molecules with protein coat
Answer: 3
2. Which of the following organisms does not have a cellular structure is_______
(1) fungus
(2) bacteria
(3) Virus
(4) amoeba
Answer: 3
3. Microorganisms that must be observed with an electron microscope are_____
(1) bacteria
(2) yeast
(3) mushroom
(4) Virus
Answer: 4
4. The shell and core of a bacteriophage are_______
(1) lipids, proteins
(2) Lipids, nucleic acids
(3) protein, nucleic acid
(4) nucleic acid, protein
Answer: 3
5. Bacteriophages are viruses that live in cells_______
(1) plant
(2) animal
(3) bacteria
(4) people
Answer: 3
6. Which of the following is not a type of virus______
(1) animal virus
(2) plant virus
(3) Prion
(4) Bacterial virus
Answer: 3
7. Which of the following virus types are the pathogens that can cause “bird flu” to chickens and ducks_________
(1) Microbial viruses
(2) plant virus
(3) Invertebrate viruses
(4) Vertebrate virus
Answer: 4
8. Which of the following statements about viruses, bacteria and fungi is correct______
(1) decomposers in the ecosystem
(2) Viruses are made up of cells
(3) Bacteria have a formed nucleus
(4) Fungi can only use readily available organic matter
Answer: 4
9. Viruses are divided into animal viruses, plant viruses and bacterial viruses, and they are classified in this way on the basis of_______
(1) According to their different structures
(2) Depending on their host
(3) According to their food
(4) According to their degree of harm to humans
Answer: 4
10. Which of the following statements is incorrect about viruses_______
(1) Viruses can’t live on their own
(2) virus camp parasitic life
(3) Viruses have cell walls
(4) Viruses can only be seen with an electron microscope
Answer: 3
11. AIDS is caused by the Human Immunodeficiency Virus (HIV), which of the following statements about the virus is correct_______
(1) cellular structure
(2) Consists of a protein coat and the genetic material inside
(3) Able to live independently on culture medium
(4) to observe with an optical microscope
Answer: 2
12. Which of the following statements is wrong for viroids?
(1) They lack a protein coat
(2) They are smaller than viruses
(3) They cause infections
(4) Their RNA is of high molecular weight
Answer: 4
13. Which of the following shows coiled RNA strand and capsomeres?
(1) Polio virus
(2) Tobacco masaic virus
(3) Measles virus
(4) Retrovirus
Answer: 2
14. A virus is made up of_______
(1) Protein coat and nucleic acid
(2) Protein coat and mitochondria
(3) Nucleic acid and cell membrane
(4) Nucleic acid, cell wall and cell membrane
Answer: 1
15. The protein coat of viruses that enclose the genetic material is called _______
(1) Virion
(2) Capsid
(3) Peplomers
(4) Capsomers
Answer: 2
16. Viruses have:
(1) DNA enclosed in a protein coat
(2) Prokaryotic nucleus
(3) Single chromosome
(4) Both DNA and RNA
Answer: 1
17. Satellite RNAs are present in some _______
(1) Plant viruses
(2) Viroids
(3) Prions
(4) Bacteriophages
Answer: 1
18. Which statement is wrong for viruses?
(1) All are parasites
(2) All of them have helical symmetry
(3) They have ability to synthesize nucleic acids and proteins
(4) Antibiotics have no effect on them
Answer: 2
19. Which of the following is the genome of the virus?
(1) DNA
(2) RNA
(3) DNA or RNA
(4) DNA and RNA
Answer: 3
20. Which of the following is the largest virus?
(1) Megavirus chilensis
(2) Arbo virus
(3) Herpes virus
(4) Mumps virus
Answer: 1
21. Virus envelope is known as:
(1) Capsid
(2) Virion
(3) Nucleoprotein
(4) Core
Answer: 1
22. The causative agent of mad-cow disease is a_________
(1) Prion
(2) Worm
(3) Bacterium
(4) Virus
Answer: 1
23. Viruses are no more “alive” than isolated chromosomes because_______
(1) both require the environment of a cell to replicate
(2) they require both RNA and DNA
(3) they both need food molecules
(4) they both require oxygen for respiration
Answer: 1
24. Which one of the following statements about viruses is correct ?
(1) Nucleic acid of viruses is known as capsid
(2) Viruses possess their own metabolic system
(3) All viruses contain both RNA and DNA
(4) Viruses are obligate parasites
Answer: 4
25. A type of cell culture that can reproduce for an extended number of generations and is used to support viral replication is a_________
(1) Primary cell culture
(2) Continuous cell line
(3) Cell strain
(4) Diploid fibroblast cell
Answer: 2
26. Which of the following is not an RNA virus?
(1) Retrovirus
(2) Enterovirus
(3) Rhabadovirus
(4) Adenovirus
Answer: 4
27. Tobacco mosaic virus is a tubular filament of size______
(1) 700 × 30 nm
(2) 300 × 10 nm
(3) 300 × 5 nm
(4) 300 × 20 nm
Answer: 4
28. Cauliflower mosaic virus contains_________
(1) ss RNA
(2) ds RNA
(3) ds DNA
(4) ss DNA
Answer: 3
29. Enzymes are absent in_________
(1) Cyanobacteria
(2) Viruses
(3) Algae
(4) Fungi
Answer: 2
30. A virus can be considered a living organism because it_________
(1) responds to touch stimulus
(2) respires
(3) reproduces (inside the host)
(4) can cause disease
Answer: 3
31. A strain of virus is made with nucleic acid of TMV (Tobacco mosaic virus) and protein coat of HRV (Holmes rib-grass virus) and then the tobacco leaf is infected__________
(1) Symptoms of TMV will appear
(2) Symptoms of HRV will appear
(3) Symptoms of both TMV and HRV will appear
(4) Symptoms of none of these will appear
Answer : 1
32. Which one of the following statement about viruses is not correct
(1) Can multiply outside a living cell
(2) Can be cultured in a cell free medium
(3) Have an independent metabolism
(4) Viruses are facultative parasite
Answer: 4
33. Which of the following is true for viruses_________
(1) They invariably contain DNA
(2) They multiply only in host cell
(3) They occur only inside bacteria
(4) Their genetic material is RNA
Answer : 2
34. Which of the following method is used for the production of vaccines against yellow fever?
(1) tissue-culture method
(2) chick-embryo method
(3) through susceptible animals
(4) through appropriate media
Answer: 2
35. Viruses cannot multiply of their own because they_______
(1) Do not have sex organs
(2) Lack genetic material
(3) Lack cellular machinery to use its genetic material
(4) None of the above
Answer : 3
36. Which one of the following statements about viruses is correct?
(1) Viruses possess their own metabolic system
(2) Viruses contain either DNA or RNA
(3) Viruses are facultative parasites
(4) Viruses are readily killed by antibiotics
Answer: 2
37. Influenza virus has_______
(1) DNA
(2) RNA
(3) both DNA and RNA
(4) only proteins and no nucleic acids.
Answer: 2
38. Tobacco Mosaic Virus (TMV) genes are_________
(1) double stranded RNA
(2) single stranded RNA
(3) polyribonucleotides
(4) proteinaceous
Answer: 2
39. Virus was discovered by_________
(1) D. Ivanowsky
(2) Beijerinck
(3) Stanley
(4) Herelle
Answer : 1
40. The Tobacco mosaic virus was crystallized for first time by________
(1) W.M. Stanley
(2) Louis Pasteur
(3) Edward Jenner
(4) Andre Lwoff
Answer : 1
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