Free Acellular Life MCQs with Answers
342 Acellular Life 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 whose capsid, nucleic acid and host-dependent replication distinguish them from living cells. HIV infection covers transmission, replication, effects on helper T cells, progression to AIDS, symptoms, prevention and treatment, while AIDS is the disease state caused by advanced immune-system damage rather than a separate virus.
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Read the Acellular Life notesFree MDCAT chapter notes with key terms342 questions · page 13 of 18
- A. Lytic phage
- B. Lysogenic phage
- C. Prophage
- D. Bacteriophage
Explanation: Option A : The phage which causes lysis of host cells is known as lytic or virulent phage.
Correct answer: Lysogenic phage- A. Self replication in host cell
- B. Duplication
- C. Self duplication
- D. Multiplication in host cell
Explanation: Option: A Bacteriophages have been widely used in genetic research because they can easily replicate inside host cells.
Correct answer: Self replication in host cell- A. Bacteria
- B. Viruses
- C. Fungi
- D. Both A and B
Explanation: According to Ivanovski, the term "soluble living germs" refers to the infectious agent responsible for causing the disease tobacco mosaic…
Correct answer: Viruses- A. Injecting DNA
- B. Replication
- C. Dissolve bacterial cell wall
- D. All of these
Explanation: The lysozyme enzyme is a digestive enzyme that 'digests the bacterial cell wall'.
Correct answer: Dissolve bacterial cell wall- A. HIV
- B. Poxviruses
- C. Covid-19
- D. HBV
Explanation: The poxviruses are the largest known DNA viruses and are distinguished from other viruses by their ability to replicate entirely in the…
Correct answer: Poxviruses- A. Virulent phage
- B. Lytic phage
- C. Temperate phage
- D. Both A and B
Explanation: The correct statement is that the phage causing the lysogenic cycle is a "Temperate Phage." Temperate phages can enter the lysogenic…
Correct answer: Temperate phage- A. Rough endoplasmic reticulum
- B. Golgi complex
- C. Nuclear envelope
- D. All of these
Explanation: The membrane stalk connecting the virion to the host membrane is constricted and severed to release the enveloped particle.
Correct answer: All of these- A. HIV
- B. Poxvirus
- C. Covid-19
- D. HBV
Explanation: Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus.
Correct answer: Poxvirus- A. Vector
- B. Capsid
- C. Plasmid
- D. Genome
Explanation: Viral capsids are the protein cage derived from the protein shell of a virus and can have different shapes, sizes, and protein subunits…
Correct answer: Capsid- A. DNA polymerase
- B. RNA polymerase
- C. Cell enzymes
- D. Viral proteins
Explanation: "DNA polymerase" is the enzyme responsible for converting the single-stranded DNA (ssDNA) virus genome into double-stranded DNA (dsDNA) in…
Correct answer: DNA polymerase- A. Take over the host machinery
- B. Synthesize nucleic acids
- C. To remove the coat of the virus
- D. Both A and B
Explanation: The main purpose of the early viral genes that are expressed is to take over the host machinery and synthesize nucleic acids.
Correct answer: Both A and B- A. Pentagon
- B. Cube
- C. Icosahedron
- D. Pyramid
Explanation: Polyhedral viruses consist of nucleic acid surrounded by a polyhedral (many-sided) shell or capsid, usually in the form of an…
Correct answer: Icosahedron- A. Lytic phage
- B. Lysogenic phage
- C. Prophage
- D. Bacteriophage
Explanation: With lytic phages, bacterial cells are broken open (lysed) and destroyed after immediate replication of the virion.
Correct answer: Lytic phage- A. Louis Pasteur
- B. Edward Jenner
- C. Charles Chamberland
- D. None of the above
Explanation: Charles Chamberland discovered that bacteria cannot pass through porcelain filters.
Correct answer: Charles Chamberland- A. TMV
- B. Smallpox
- C. Poliovirus
- D. Adenovirus
Explanation: Tobacco mosaic virus was the first virus to be crystallized. It was achieved by Wendell Meredith Stanley in 1935.
Correct answer: TMV- A. Penicillin
- B. Streptomycin
- C. Both A and B
- D. None
Explanation: Antibiotics are not effective against viral infections like colds, influenza (flu), most sore throats, bronchitis, and many sinus and ear…
Correct answer: Both A and B- A. Satellite virus
- B. HAV
- C. HCV
- D. HIV
Explanation: Option A is correct as a "satellite virus" is a subviral agent that depends on the co-infection of a host cell with a helper virus for its…
Correct answer: Satellite virus- A. For naked virions, the surface capsid proteins are responsible for binding to a specific cell receptor
- B. For enveloped viruses, the spikes are responsible for binding to a specific cell receptor
- C. Cell lacking a receptor for a specific virus is not infected by that virus
- D. None of the above
Explanation: The virus attachment protein is the viral protein that facilitates the docking of the virus to the plasma membrane of the host cell, the…
Correct answer: None of the above- A. Virophage
- B. Lysophage
- C. Bacteriophage
- D. None of these
Explanation: A bacteriophage is a type of virus that infects bacteria. In fact, the word "bacteriophage" literally means "bacteria eater," because…
Correct answer: Bacteriophage- A. Satellite virus
- B. HAV
- C. HCV
- D. HIV
Explanation: Satellite viruses are a polyphyletic group of viruses encoding structural components of their virions, but incapable of completing the…
Correct answer: Satellite virus