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 16 of 18
- A. Cytoplasm
- B. Nucleus
- C. Microtubules
- D. Golgi complex
Explanation: There is no outer covering in such viruses and so, their nucleocapsids are assembled in the cytoplasm.
Correct answer: Cytoplasm- A. Translation
- B. Duplication
- C. Replication
- D. Reverse Transcription
Explanation: Reverse transcription is a process by which the DNA molecule is formed from the RNA template and the process is catalyzed by the enzyme…
Correct answer: Reverse Transcription- A. Ligase
- B. Reverse Transcriptase
- C. RNA Polymerase
- D. DNA Polymerase
Explanation: HIV is a retrovirus. Its genome consists of RNA molecules, and it possesses a 'reverse transcriptase enzyme', which allows the virus to…
Correct answer: Reverse Transcriptase- A. HBV
- B. HAV
- C. HCV
- D. None of these
Explanation: Hepatitis C virus (HCV), is an enveloped single-stranded RNA virus which appears to be distantly related (possibly in its evolution) to…
Correct answer: HCV- A. Enveloped RNA.
- B. DNA Virus.
- C. RNA tumor.
- D. Both B and C.
Explanation: b) DNA Virus: This is the correct option. Herpes simplex is caused by herpes simplex virus (HSV), which is a DNA virus.
Correct answer: DNA Virus.- A. Influenza
- B. Herpes Simplex
- C. Polio
- D. Smallpox
Explanation: [A] Influenza is RNA based virus and enveloped also[B] Herpes is not caused by Enveloped RNA virus[C] Polio is caused by non-enveloped RNA…
Correct answer: Influenza- A. DNA virus
- B. RNA enveloped virus
- C. DNA enveloped virus
- D. RNA virus
Explanation: Influenza is caused by an enveloped RNA virus.
Correct answer: RNA enveloped virus- A. Hepatitis
- B. Cholera
- C. Influenza
- D. Candidiasis
Explanation: Hepatitis B and Hepatitis C are blood borne diseases, which can be transferred to other individuals by blood contact.
Correct answer: Hepatitis- A. Landing → Tail contraction → Penetration → DNA Injection
- B. Penetration → Landing → Tail contraction → DNA Injection
- C. Tail contraction → Landing → DNA Injection → Penetration
- D. Landing → Penetration → Tail contraction → DNA Injection
Explanation: The phage first attaches itself by its tail to the cell wall of bacterium at a point called receptor site.
Correct answer: Landing → Tail contraction → Penetration → DNA Injection- A. Ectoparasites
- B. Endoparasites
- C. Obligative Intracellular Parasites
- D. Facultative Intracellular Parasites
Explanation: Intracellular obligate parasites depend on the host not only for nutrition but also for reproduction.
Correct answer: Obligative Intracellular Parasites- A. Mycoplasma
- B. Escherichia coli
- C. Herpes virus
- D. Diplococcus
Explanation: Herpes virus is essentially a virus and since viruses do not fall under the category of cellular beings, herpes virus is a non-cellular…
Correct answer: Herpes virus- A. Without invading any cell.
- B. In bacterial cell.
- C. By Mitosis
- D. By Meiosis
Explanation: Viruses are incapable of reproducing on their own, so they hunt for a host cell for hijacking.
Correct answer: In bacterial cell.- A. Transduction
- B. Temperate phage cycle
- C. Lytic cycle
- D. Lysogenic phage cycle
Explanation: In the lytic cycle the phage infects a bacterium, hijacks the bacterium to make lots of phages, and then kills the cell by making it…
Correct answer: Lytic cycle- A. Nucleocapsid
- B. Prion
- C. Envelope
- D. Capsomeres
Explanation: The capsid and nucleic acid together are known as the nucleocapsid.A prion is a type of protein that can trigger normal proteins in the…
Correct answer: Nucleocapsid- A. Enveloped Phage
- B. Virulent Phage
- C. Temperate phages
- D. Bacteriophage
Explanation: Temperate phages are some bacteriophages which display a lysogenic life cycle.
Correct answer: Temperate phages- A. Capsid
- B. Cosmid
- C. Capsomere
- D. Chromophore
Explanation: The outer protein coat of a virus is known as 'the capsid'. It consists of several oligomeric structural subunits made of a protein called…
Correct answer: Capsid- A. Lymphocytes
- B. RBC
- C. T_Cell
- D. B_ cells
Explanation: While HIV can infect other types of cells, including monocytes, macrophages, and dendritic cells, it has a particular affinity for…
Correct answer: T_Cell- A. 50 molecules per virion
- B. 40 molecules per virion
- C. 30 molecules per virion
- D. 20 molecules per virion
Explanation: In summary, the specific number of reverse transcriptase molecules per HIV virion can vary due to factors like viral strain and infection…
Correct answer: 50 molecules per virion319. H.I.V contains
- A. two RNAs
- B. a single R.N.A
- C. D.N.A and R.N.A
- D. D.N.A
Explanation: HIV contains two identical RNAs enclosed within capsid
Correct answer: two RNAs- A. One million
- B. Two million
- C. Three million
- D. Five million
Explanation: AIDS is a major global health concern, with mortality rates exceeding three million per year worldwide.
Correct answer: Three million