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 12 of 18
- A. 1935
- B. 1930
- C. 1932
- D. 1920
Explanation: Tobacco mosaic virus was the first virus to be crystallized. It was achieved by Wendell Meredith Stanley in 1935 who also showed that TMV…
Correct answer: 1935- A. Lytic phage
- B. Lysogenic phage
- C. The viral capsid
- D. An infectious and fully forward viral particle
Explanation: A complete mature,infectious particle having inner nucleic acid and capsid around it is called a virion.
Correct answer: An infectious and fully forward viral particle- A. Adenovirus
- B. Pox virus
- C. Influenza virus
- D. Paramyxoviruses
Explanation: Mumps, like measles, is a disease caused by an RNA virus classified in the "Paramyxoviridae" family.
Correct answer: Paramyxoviruses- A. DNA enveloped virus
- B. RNA enveloped virus
- C. DNA virus
- D. RNA naked virus
Explanation: HBV (Hepadna virus) virus is a DNA-enveloped virus it is the cause of hepatitis B. So, option A is accurate.
Correct answer: DNA enveloped virus- A. They are too small
- B. They have no cell wall
- C. They lack metabolic machinery
- D. All of the options are correct
Explanation: Viruses lack metabolic machinery thus they can not replicate themselves. So, option C is accurate.
Correct answer: They lack metabolic machinery- A. DNA and RNA
- B. DNA
- C. RNA
- D. DNA or RNA
Explanation: Option D is correct. Viruses can have either DNA or RNA as their genetic material.
Correct answer: DNA or RNA- A. Lytic phages
- B. Virulent phages
- C. Temprate phages
- D. None of these options is correct
Explanation: Option A; virulent bacteriophages, which immediately produce progeny and lyse the host cell.Option B: lytic phage is virulent phageOption…
Correct answer: Temprate phages- A. DNA enveloped virus
- B. RNA enveloped virus
- C. DNA virus
- D. Naked virus
Explanation: Option B is orrect. Option B is correct. a family of single-stranded RNA viruses.
Correct answer: RNA enveloped virus- A. Influenza
- B. Smallpox
- C. Mumps and measles
- D. AIDS
Explanation: Paramyxoviruses are a group of viruses that cause diseases such as mumps and measles. All the other options are incorrect.
Correct answer: Mumps and measles- A. Herpes virus
- B. Reovirus
- C. Polio virus
- D. Papillomavirus
Explanation: Among all of the above options, only herpes is an enveloped virus. All the rest are non-enveloped.
Correct answer: Herpes virus- A. genome and capsid
- B. capsid and spikes
- C. envelope and capsid
- D. capsomeres and genome
Explanation: FACTUAL RECALLThe virions are composed of a central core of nucleic acid, either DNA or RNA, which is also known as the genome and is…
Correct answer: genome and capsid- A. Icosahedral virus
- B. Naked virus
- C. Enveloped virus
- D. Bilayer virus
Explanation: a. Icosahedral virus: Icosahedral viruses have a symmetrical structure that resembles a 20-sided polyhedron.
Correct answer: Naked virus- 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: Capsomeres are tiny subunits that make up the protein coat, referred to as the capsid.
Correct answer: It is an individual unit of the capsid234. In what year did the World Health Organization declare that smallpox was completely eradicated?
- A. 1990
- B. 1980
- C. 2001
- D. 1995
Explanation: Almost two centuries after Jenner hoped that vaccination could annihilate smallpox, the 33rd World Health Assembly declared the world free…
Correct answer: 1980- A. Bacteriophages
- B. Animal viruses
- C. Plant viruses
- D. Fungal viruses
Explanation: Bacteriophages are viruses that infect bacteria. They produce the enzyme lysozyme, which causes the host bacterial cell to burst and die…
Correct answer: Bacteriophages- A. 100mm to 150mm
- B. 20nm to 250nm
- C. 300nm to 3000nm
- D. 3nm to 30nm
Explanation: Viruses are pathogens, which cause diseases in animals and plants.The size of a virus ranges between 20nm-250nm in length.Hence, B is the…
Correct answer: 20nm to 250nm- A. Hexagonal capsomeres
- B. Pentagonal capsomeres
- C. Triangular Capsomeres
- D. Both options A and B are correct
Explanation: Capsid: The coat is the outer covering of a viral particle which consists of a capsid and envelope.
Correct answer: Both options A and B are correct- A. HSV-2
- B. Varicella-zosster virus
- C. Oncovirus
- D. Picornavirus
Explanation: An oncovirus or oncogenic virus is a virus that can cause cancer. Hence, C is the correct option.
Correct answer: Oncovirus- A. 250
- B. 200
- C. 150
- D. 100
Explanation: Option B is correct as there is are 200 bacteriophages produced after 25 minutes of initial infection.
Correct answer: 200- A. The mitochondrion of the cell
- B. Cell membrane of host cell
- C. Endoplasmic reticulum of the cell
- D. None of these
Explanation: Correct option is B. The outermost layer of a virus is the envelope. A large number of viruses do not have envelopes.
Correct answer: Cell membrane of host cell