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 5 of 18
- A. Prophage
- B. Capsid
- C. Viron
- D. Retrovirus
Explanation: A temperate phage can integrate its DNA into the bacterial chromosome, where it is called a prophage.
Correct answer: Prophage- A. Joins the bacterial chromosomes
- B. Attaches to the inner surface of the host membrane
- C. Is immediately degraded when enters the host
- D. Goes directly to host ribosomes for translation
Explanation: In the lysogenic cycle, bacteriophage DNA becomes integrated into the bacterial chromosome and is replicated with the host DNA as a…
Correct answer: Joins the bacterial chromosomes- A. Spherical
- B. Rod Shaped
- C. Tadpole like
- D. Hexagonal
Explanation: Tobacco mosaic virus has a rigid helical capsid that gives the virion a characteristic rod-shaped form.
Correct answer: Rod Shaped- A. Absorption
- B. Multiplication
- C. Lysogeny
- D. Penetration
Explanation: After a phage attaches, or adsorbs, to receptors on the bacterial cell wall, it injects its nucleic acid into the host during penetration.
Correct answer: Penetration- A. Measles
- B. Herpes simplex
- C. Hepatitis
- D. Polio
Explanation: Poliovirus attacks motor neurons in the central nervous system and can cause paralysis.
Correct answer: Polio- A. Lysis
- B. Lysogeny
- C. Induction
- D. Adsorption
Explanation: Induction is the excision of prophage DNA from the bacterial chromosome followed by entry into the lytic cycle, often after environmental…
Correct answer: Induction- A. DNAase
- B. RNAase
- C. DNA polymerase
- D. Reverse Transcriptase
Explanation: Reverse transcriptase uses an RNA template to synthesize complementary DNA and can ultimately produce double-stranded viral DNA.
Correct answer: Reverse Transcriptase- A. Phage when gets incorporated with the bacterial chromosome is called prophage
- B. The bacterium continues to live and reproduce normally
- C. Lysogenic bacteria may get infected by the related phage
- D. The cycle may convert into lytic type resulting from environmental exposure
Explanation: A lysogenic bacterium containing a prophage is generally immune to superinfection by the same or a closely related phage because prophage…
Correct answer: Lysogenic bacteria may get infected by the related phage- A. Hepatitis virus
- B. Retrovirus
- C. Polio virus
- D. Pox virus
Explanation: Retroviruses have a strong association with tumour formation because some carry oncogenes or can activate host genes after integrating…
Correct answer: Retrovirus- A. Bacteria
- B. Cowpox Virus
- C. Adenovirus
- D. Prion
Explanation: Mad cow disease, or bovine spongiform encephalopathy, is caused by a prion, an infectious misfolded protein lacking a conventional…
Correct answer: Prion- A. Hepatitis virus
- B. Retrovirus
- C. Polio virus
- D. Pox virus
Explanation: Among these options, poliovirus is the smallest, with a compact, non-enveloped capsid and a genome of roughly 7.5 kilobases.
Correct answer: Polio virus- A. Separates in to two inner parts
- B. Can not metabolize
- C. Rapidly looses its Genome chemical inert
- D. Is coated with an air tight shield
Explanation: An isolated virus cannot perform independent metabolism because it lacks cellular machinery such as ribosomes and metabolic enzymes.
Correct answer: Can not metabolize- A. M type
- B. N type
- C. T type
- D. S type
Explanation: The bacteriophages that infect Escherichia coli are classically called T phages, including T1 through T7.
Correct answer: T type- A. Strong covalent bond between virion and the receptor site.
- B. Week chemical unior between them
- C. Both A and B depending upon the phage
- D. None of these
Explanation: Phage attachment to a bacterial receptor is a specific, reversible interaction involving weak non-covalent forces rather than a strong…
Correct answer: Week chemical unior between them- A. Serum
- B. Faeco-oral
- C. Sexual contact
- D. All of these
Explanation: Hepatitis A virus is mainly transmitted by the faeco-oral route, when contaminated food or water carries the virus from faeces into…
Correct answer: Faeco-oral- A. Surrounded by genome
- B. Surrounding genome
- C. Surrounding the envelope
- D. Both B and C
Explanation: The capsid is the protein shell that encloses and protects the viral genome.
Correct answer: Surrounding genome- A. HAV
- B. HBV
- C. HCV
- D. HEV
Explanation: No routinely available preventive vaccine exists for hepatitis C because HCV has extensive genetic variation and changes its surface…
Correct answer: HCV- A. Virus
- B. Viral protein
- C. Viral lysozyme
- D. Viral gene
Explanation: A virion is a complete, mature virus particle outside a host cell, consisting of viral nucleic acid enclosed by a capsid and sometimes an…
Correct answer: Virus- A. We can not grow them in laboratories on artificial medias
- B. They are obligate intracellular parasite.
- C. They can synthesize their nucleic acid
- D. They are resistant to most of antibiotic treatment
Explanation: Viruses do not independently synthesize their nucleic acids because they lack the complete metabolic and protein-synthesis machinery of…
Correct answer: They can synthesize their nucleic acid- A. 100
- B. 152
- C. 162
- D. 172Preparing For College Admissions Tests
Explanation: The herpesvirus capsid is an icosahedral structure made of 162 capsomeres.
Correct answer: 162