Free Viruses MCQs with Answers
247 Viruses MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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- A. Viruses
- B. Ingestion
- C. Binary fission
- D. Physical contact
Explanation: Transduction is a process of genetic recombination in bacteria where DNA is transferred from one bacterium to another through a…
Correct answer: Viruses- A. Virus
- B. Bacillus
- C. Viroid
- D. Prion
Explanation: Hepatitis D, also known as delta hepatitis, is indeed caused by the hepatitis D virus (HDV).HDV is a small, circular RNA virus that…
Correct answer: Virus- A. The protein of T2 and DNA of T4
- B. The protein of T4 and DNA of T2
- C. The protein and DNA of T2
- D. The protein and DNA of T4
Explanation: The phages produced in the host cell would have the protein coat of phage T2 and the DNA of phage T4.
Correct answer: The protein of T2 and DNA of T4- A. Rodents
- B. Fowls
- C. Cats
- D. All of these
Explanation: d) All of these:The correct answer is d) All of these. Retroviruses have been identified to cause diseases in rodents, fowls, and cats.
Correct answer: All of these- A. Rhabdo Virus
- B. Reo Virus
- C. Parvo Virus
- D. Rhino Virus
- E. Herpes Virus
Explanation: Explanation for this question will be added soon.
Correct answer: Rhino Virus- A. DNA and RNA
- B. DNA
- C. RNA
- D. DNA or RNA
Explanation: Option D is correct since viruses can store decoded information ( genetic information ) to a limited extent.
Correct answer: DNA or RNA- A. Adenovirus
- B. Pox virus
- C. Influenza virus
- D. Herpes virus
Explanation: Infection with herpes simplex virus (HSV), known as herpes, is common globally.
Correct answer: Herpes virus- A. Envelope
- B. DNA
- C. Capsid
- D. Tail Fibers
Explanation: All viruses contain nucleic acid, either DNA or RNA, and a protein coat, which encases the nucleic acid i.e. a capsid.
Correct answer: Capsid- A. DNA
- B. RNA
- C. Both a and b
- D. Proteins
Explanation: The genetic material of plant viruses mostly consists of option B: RNA.Explanation:A) DNA: While some viruses, such as certain…
Correct answer: RNA- A. They are cuboidal in shape
- B. They are enveloped by host plasma membrane
- C. They do have enzyme reverse transcriptase
- D. All of them are not specific
Explanation: The first option is correct: Retroviruses are not cuboidal in shape. Retroviruses are actually spherical or roughly spherical in shape.
Correct answer: They are cuboidal in shape- A. HIV
- B. Hepatitis
- C. Measles
- D. Influenza
Explanation: FACT: Influenza is a viral disease and is caused by RNA enveloped virus, called the influenza virus.
Correct answer: Influenza- A. Spring shape
- B. Rod shape
- C. Comma shape
- D. Spherical shape
Explanation: This is factual recall from the chapter of acellular life which states that TMV is a helical virus that appears rod shaped so option B is…
Correct answer: Rod shape- A. Entry
- B. Assembly
- C. Uncoating
- D. Adsorption or Attachment
Explanation: Viral infections follow similar steps in the virus replication cycle: attachment or adsorption, penetration, uncoating, replication…
Correct answer: Adsorption or Attachment- A. Viruses have their own ribosomes for protein formation.
- B. New viral ribosomes are formed after viral DNA enters the cell.
- C. Viruses do not need ribosomes for protein formation.
- D. Viruses use the host ribosomes for their own requirements.
Explanation: Viruses are nonliving outside the host cell. When they enter the host cell they use the machinery of the host cell for their replication.
Correct answer: Viruses use the host ribosomes for their own requirements.- A. Bacteria
- B. Fungi
- C. Virus
- D. Malaria
Explanation: Option A: Bacteria are single-celled organisms that can cause disease. They are not derived from the Latin word venemus.
Correct answer: Virus- A. Bacterial disease
- B. Viral disease
- C. Protozoan disease
- D. Viroid disease
Explanation: a. Bacterial disease: Bacterial diseases were among the first for which effective prevention methods were developed.
Correct answer: Viral disease- A. Hepatitis B
- B. Hepatitis A
- C. Hepatitis D
- D. Hepatitis C
Explanation: The combination of alpha interferon and ribavirin has been used in the treatment of hepatitis, particularly in the context of hepatitis C.
Correct answer: Hepatitis C- A. Envelope
- B. DNA
- C. Capsid
- D. Protein Coat
Explanation: A virus' protein coat contains receptors. The virus recognizes and binds to a host cell via a receptor.
Correct answer: Protein Coat- A. Spikes
- B. Envelope
- C. Capsid
- D. DNA
Explanation: The viral envelope is often covered with glycoprotein spikes that help them to recognize the host cell.
Correct answer: Spikes- A. Can be crystallized
- B. No cellular respiration
- C. Mutate their genetic malerial
- D. Lack biosynthetic machinery
Explanation: Living characteristics of viruses include the ability to reproduce - but only in living host cells - and the ability to mutate.
Correct answer: Mutate their genetic malerial