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 14 of 18
- A. Adenovirus
- B. Herpes virus
- C. Poliovirus
- D. None of these
Explanation: The correct option is B as out of all the above-mentioned viruses, only herpes virus is an enveloped virus as it has a lipid envelope…
Correct answer: Herpes virus- A. 1
- B. 20
- C. 3
- D. 4
Explanation: In icosahedral viruses, the capsomeres are arranged in equilateral triangles.
Correct answer: 20- A. Picornavirus
- B. Parvoviruses
- C. Herpes virus
- D. Rotavirus
Explanation: Option B is correct since parvoviruses are the smallest icosahedral particles about 18-26 nm in diameter.
Correct answer: Parvoviruses- A. 100 to 160 nm
- B. 20 to 250 nm
- C. 100 nm to 360 nm
- D. Always below than 100 nm
Explanation: The average diameter of viruses is generally considered to be between 20-250 nanometers (nm), although some viruses can be smaller or…
Correct answer: 20 to 250 nm- A. Rod
- B. Spherical
- C. Tadpole
- D. Helical
Explanation: The shape of TMV virus is rod-shaped or filamentous. TMV stands for Tobacco Mosaic Virus, and it is a type of virus that infects plants…
Correct answer: Rod- A. Yes
- B. No
- C. Provided by cell usually
- D. Provided by virus machinery
Explanation: The attachment of a virus to a host cell does not require energy. The process of virus attachment is typically mediated by specific viral…
Correct answer: No- 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. All of the above.
Explanation: .The surface of capsid protein is responsible for binding to a specific cell receptor in naked virions.
Correct answer: All of the above.- A. TMV
- B. T4 Phage
- C. Poxvirus
- D. Herpes virus
Explanation: Tobacco mosaic virus (TMV) is a well-studied plant virus that belongs to the Tobamovirus genus.
Correct answer: TMV- A. Induction
- B. Penetration
- C. Lytic
- D. Lysogenic
Explanation: The process in which a phage (bacteriophage) integrates its genetic material into the host bacterium's chromosome and becomes a part of it…
Correct answer: Lysogenic- A. Lysogenic cycle
- B. Lytic cycle
- C. Both
- D. None
Explanation: Maturation is when the nucleic material of the bacteriophage has been replicated and now new bacteriophages are being assembled for…
Correct answer: Lytic cycle- A. T-phages
- B. P-phages
- C. Both
- D. None
Explanation: Bacteriophages, or simply phages, are viruses that infect and replicate within bacteria.
Correct answer: T-phages- A. self-replication in host cell
- B. duplication
- C. self-duplication
- D. multiplicate in host cell
Explanation: Bacteriophages are used to insert genes inside host cells as they are small enough to enter and replicate inside the host cells as they…
Correct answer: multiplicate in host cell- A. DNA enveloped virus
- B. RNA enveloped virus
- C. DNA virus
- D. RNA non-enveloped virus
Explanation: Like other OPXVs, VARV and MPXV produce large brick-shaped particles that are approximately 140-260 nm in diameter and 220-450 nm long…
Correct answer: DNA enveloped virus- A. Vector
- B. Capsid
- C. Plasmid
- D. Genome
Explanation: Option B is correct since the 'capsid' is the protein shell that encloses the nucleic acid.
Correct answer: Capsid- A. Animals
- B. Bacteria
- C. Plants
- D. All of the above
Explanation: Viruses cannot replicate on their own, but rather depend on their host cell's protein synthesis pathways to reproduce.
Correct answer: All of the above- A. Tail
- B. Sheath
- C. Collar
- D. Head
Explanation: Option D is correct since the double-stranded DNA molecule is present within the head. The upper hexagonal-shaped part is the head.
Correct answer: Head- A. AIDS
- B. Malaria
- C. Influenza
- D. Chickenpox
- E. Rabies
Explanation: Malaria is not a viral disease and is caused by protozoa plasmodium. All other options are viral infections that include: AIDS caused by…
Correct answer: Malaria- A. Rough endoplasmic reticulum
- B. Golgi complex
- C. Nuclear envelope
- D. All of these options are correct
Explanation: Viruses can bud at every stage in the ER-Golgi-cell membrane pathway.
Correct answer: All of these options are correct- A. Fungus
- B. Prokaryote
- C. Living organism
- D. Obligate intracellular parasite
Explanation: Bacteriophages are actually obligate intracellular viruses. This means that they can only replicate and complete their life cycle by…
Correct answer: Obligate intracellular parasite- A. It is an individual unit of the capsid
- B. It is a viral protein for replication
- C. It is a unit of nucleic acid in viruses
- D. All of the above
Explanation: Correct option: A Capsomeres are subunits of capsids.
Correct answer: It is an individual unit of the capsid