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 7 of 18
- A. Hepatitis A virus
- B. Varicella zoster virus
- C. Influenza virus
- D. HIV
Explanation: Chickenpox (varicella) is an infectious disease caused by the vancella zoster virus (VZV), a member of the herpesvirus family.
Correct answer: Varicella zoster virus- A. HAV
- B. HBV
- C. HCV
- D. HDV
Explanation: Genetically Engineered vaccines are not available for "HCV" (Hepatitis C- Virus).
Correct answer: HCV- A. Prion
- B. Virus
- C. Bacteria
- D. Both a and b
Explanation: Mad Cow Disease (Bovine Spongiform Encephalopathy, BSE) is a fatal neurodegenerative disorder in cattle caused by prions-misfolded…
Correct answer: Prion- A. TMV
- B. Smallpox
- C. Poliovirus
- D. Adenovirus
Explanation: TMV (tobacco mosaic virus) is the first virus to be successfully crystallized.The filterable agents were first purified in 1935, when…
Correct answer: TMV- A. Largest in size
- B. DNA genome
- C. Envelope
- D. None of these
Explanation: Poxviruses are the largest viruses known to science. They can be up to 200 nanometers in diameter, which is much larger than most other…
Correct answer: Largest in size- A. It can affect the testes and ovaries.
- B. Passive immunisation is the only treatment.
- C. The vaccine is not available
- D. Widely spread
Explanation: Mumps was more widespread in the past, but due to widespread vaccination efforts, the incidence of mumps has significantly decreased in…
Correct answer: Widely spread- A. Tuberculosis
- B. AIDS
- C. Dengue fever
- D. Cholera
Explanation: Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus…
Correct answer: AIDS- A. Acute infection➝ Chronic infection➝ AIDS
- B. AIDS ➝ Acute infection ➝ Chronic infection
- C. Chronic infection ➝ AIDS ➝ Acute infection
- D. Acute infection ➝ AIDS ➝ Chronic infection
Explanation: HIV infection progresses through three main stages. The first stage is acute HIV infection, which usually occurs 2-4 weeks after exposure.
Correct answer: Acute infection➝ Chronic infection➝ AIDS- A. Human immunodeficiency virus
- B. Retroviruses
- C. Influenza virus
- D. Paramyxoviruses
Explanation: Option: A AIDS is caused by the human immunodeficiency virus (HIV). AIDS is the name used to describe potentially life-threatening…
Correct answer: Human immunodeficiency virus- A. 100
- B. 200
- C. 1000
- D. None of these
Explanation: The correct option is D (None of the above), as the capsomeres are arranged in 20 equilateral triangles in icosahedral viruses.
Correct answer: None of these- A. Cytoplasmic RNA polymerase
- B. None of these
- C. Host RNA polymerase
- D. Viral RNA polymerase
Explanation: The synthesis of HIV mRNA does not occur through a cytoplasmic RNA polymerase or a viral RNA polymerase.
Correct answer: Host RNA polymerase- A. SIV
- B. CIV
- C. HBV
- D. HIV-2
Explanation: Chimpanzees have SIV, or simian immunodeficiency virus, instead of HIV. SIV is a closely related virus to HIV, and it can infect humans.
Correct answer: SIV- A. 100 to 160nm
- B. 100 to 200nm
- C. 100 to 360nm
- D. Always below than 100nm
Explanation: Most viruses vary in diameter from 20 nanometers (nm; 0.0000008 inch) to 250-400 nm; the largest, however, measure about 500 nm in…
Correct answer: 100 to 200nm- A. Spring shape
- B. Rod shape or helical shape
- C. Comma shape
- D. Spherical shape
Explanation: This is factual recall from the chapter of acellular life which states that TMV is a helical virus that appears rod shaped so option B is…
Correct answer: Rod shape or helical shape- A. Nucleoproteins
- B. Nucleocapsid
- C. Tail of virus
- D. Capsid
Explanation: a. Nucleoproteins-Proteins bound to nucleic acids; important for genome function but not for environmental stability.b.
Correct answer: Capsid136. Viroids lack:
- A. RNA
- B. Enzyme
- C. Protective protein coat
- D. All of these
Explanation: The correct option is C. Viroids lack a protein coat. Viroids are the smallest known infectious agents.
Correct answer: Protective protein coat- A. 162
- B. 200
- C. 252
- D. 155
Explanation: The adenovirus particle consists of an icosahedral protein shell surrounding a protein core that contains the linear, double-stranded DNA…
Correct answer: 252- A. Small pox
- B. Mumps
- C. Measles
- D. Chicken pox
Explanation: The correct option, A, is that Edward Jenner prepared a vaccine against smallpox in 1796.
Correct answer: Small pox- A. Severe and novel disease
- B. Non mutated
- C. Novel disease
- D. None of these
Explanation: When a virus encounters an unfamiliar organism, it may undergo several mutations during replication.
Correct answer: Severe and novel disease- A. All are parasites.
- B. All of them have helical symmetry.
- C. They don't have the ability to synthesise nucleic acids and proteins.
- D. Antibiotics have no effect on them.
Explanation: This statement is incorrect. Viruses can have different symmetries, including helical, icosahedral. or complex. structures.
Correct answer: All of them have helical symmetry.