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 4 of 18
- A. Cellular
- B. Prokaryotes
- C. Non-cellular
- D. Eukaryotes
Explanation: Viruses are non-cellular because they lack cytoplasm, ribosomes and independent cellular metabolism.
Correct answer: Non-cellular- A. RNA
- B. Protein
- C. DNA
- D. None of these
Explanation: Nearly all known bacteriophages have DNA as their genetic material, although a small number of phages possess RNA genomes.
Correct answer: DNA- A. Cowpox
- B. Mumps
- C. Tetanus
- D. Small pox
Explanation: Tetanus is caused by the bacterium Clostridium tetani, whereas cowpox, mumps, and smallpox are viral diseases.
Correct answer: Tetanus- A. Measles
- B. Polio
- C. Small pox
- D. Hepatitis
Explanation: Smallpox was eradicated worldwide through an effective coordinated vaccination programme, and the World Health Organization declared…
Correct answer: Small pox- A. Measles
- B. Cancer
- C. Diabetes
- D. Heart attack
Explanation: Measles is caused by a virus and can be effectively prevented through vaccination, which prepares immune memory before infection occurs.
Correct answer: Measles- A. virion
- B. mycoplasma
- C. viroids
- D. prions
Explanation: Viroids are the smallest known infectious agents of plants and consist only of short, circular strands of RNA without a protein coat.
Correct answer: viroids- A. bacteria
- B. fungi
- C. virus
- D. none of these
Explanation: Bacteria cause many diseases that can be treated with antibiotics because antibiotics target bacterial structures or processes, such as…
Correct answer: bacteria- A. It is a non-cellular entity
- B. Obligate parasite
- C. Ultramicroscopic in size
- D. All of these
Explanation: Viruses are non-cellular particles made of genetic material surrounded by a protein coat, and they are usually ultramicroscopic.
Correct answer: All of these- A. Ligase
- B. Endonuclease
- C. Exonuclease
- D. Gyrase
Explanation: Restriction endonucleases protect bacteria by cutting invading viral DNA at specific internal recognition sequences, thereby disabling the…
Correct answer: Endonuclease- A. Bacteria
- B. Virus
- C. Cyanobacteria
- D. Plants
Explanation: Viruses are considered a link between living and non-living matter because they show living activity only inside host cells, while outside…
Correct answer: Virus- A. Rubella
- B. Common cold
- C. Influenza
- D. None of the above
Explanation: Rubella, the common cold and influenza can all spread through infectious respiratory droplets, so none of the listed diseases is excluded.
Correct answer: None of the above- A. Obligate parasite
- B. Autotrophs
- C. Heterotrophs
- D. Absorptive heterotrophs
Explanation: Viruses are obligate parasites because they lack the cellular machinery needed for independent metabolism and reproduction, so they must…
Correct answer: Obligate parasite- A. MERS
- B. SARS-CoV-2
- C. OC43
- D. HKUt
Explanation: SARS-CoV-2 is an emergent coronavirus that caused the COVID-19 pandemic and millions of deaths worldwide.
Correct answer: SARS-CoV-2- A. Rest period
- B. Incubation period
- C. Sleeping period
- D. Inclubation time
Explanation: The incubation period is the time between entry of a pathogen into the body and the appearance of disease symptoms.
Correct answer: Incubation period- A. Liver of man
- B. RBC of man
- C. Stomach wall of mosquito
- D. Salivary glands of mosquito
Explanation: Sporogony is the sexual stage of Plasmodium and occurs in the female Anopheles mosquito, mainly in its stomach wall after fertilisation.
Correct answer: Stomach wall of mosquito- A. Pasteur
- B. Chamberland
- C. Stanely
- D. Ivanowski
Explanation: Wendell M. Stanley crystallized tobacco mosaic virus in 1935, demonstrating that viruses could behave like chemical substances outside…
Correct answer: Stanely- A. sporozoites
- B. merozoites
- C. zygote
- D. none of these
Explanation: The female Anopheles mosquito injects Plasmodium sporozoites into human blood during a bite, and these first travel to liver cells.
Correct answer: sporozoites- A. bacteria
- B. protist
- C. virus
- D. fungi
Explanation: Influenza is caused by influenza viruses, which are enveloped RNA viruses that infect the respiratory tract.
Correct answer: virus- A. Replicated
- B. Turn off by the protein coat.
- C. Digested into its nucleotides
- D. Turned on by the removal of the protein coat
Explanation: During the lytic cycle, bacteriophage nucleases break the host bacterial DNA into nucleotides, which can then be reused for making viral…
Correct answer: Digested into its nucleotides- A. Influenza virus
- B. Herpes virus
- C. HBV
- D. Pox virus
Explanation: Influenza virus contains RNA as its genetic material, specifically segmented single-stranded RNA.
Correct answer: Influenza virus