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Home Microbiology Viruses See What Others Are Saying!
  • Question
  • In the simplest capsid, there is a capsomere at each of the 12 vertices; this capsomere, which is surrounded by five other capsomeres, is termed a


  • Options
  • A. penton
  • B. polyhedra
  • C. icosahedral
  • D. helical

  • Correct Answer
  • penton 


  • More questions

    • 1. Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

    • Options
    • A. actin
    • B. interleukin
    • C. HLA
    • D. CD8
    • Discuss
    • 2. Which of the following disease is caused by DNA viruses?

    • Options
    • A. Poliomyelitis
    • B. Yellow fever
    • C. Measles
    • D. Small pox
    • Discuss
    • 3. Gassiness resulting from the liberation of carbon dioxide by hetero fermentative lactics is called

    • Options
    • A. pousse
    • B. amertume
    • C. mannitic
    • D. none of these
    • Discuss
    • 4. Which of the following statements is false regarding B cells?

    • Options
    • A. B cells can undergo class switching and produce a different antibody type
    • B. B one marrow stem cells migrate to the thymus and develop into B cells
    • C. B cells synthesize antibodies and put them on their cell surface
    • D. B cells that recognize high concentrations of antigens (self) in the absence of other signals undergo apoptosis in the bone marrow
    • Discuss
    • 5. What is common in catheters and ventilators?

    • Options
    • A. They bypass important defenses of the body
    • B. Bacteria responsible for associated infections are usually susceptible to antibiotics
    • C. They predispose patients to viral rather than bacterial infections
    • D. They are used primarily in neonatal intensive care units
    • Discuss
    • 6. Pseudomembraneous colitis is

    • Options
    • A. precipitated by the use of certain antibiotics
    • B. caused by a gram-positive bacterium
    • C. caused by a spore-forming bacterium
    • D. all of the above
    • Discuss
    • 7. Which of the following toxin resembles cholera toxin?

    • Options
    • A. Stable toxin of E. coli
    • B. Diphtheria toxin
    • C. Labile toxin of Escherichia coli
    • D. Tetanus toxin
    • Discuss
    • 8. Catalase production is negative in which of the following?

    • Options
    • A. Streptococcus
    • B. Salmonella
    • C. Proteus
    • D. Staphylococcus
    • Discuss
    • 9. The "A" subunit of diphtheria toxin

    • Options
    • A. binds host cell receptors found on heart cells
    • B. cause ADP ribosylation of a factor involved in protein synthesis
    • C. forms cAMP that leads to fluid accumulation
    • D. lysis macrophages with the release of cytokines
    • Discuss
    • 10. The process of Gram staining is based on the ability of bacterial cell wall

    • Options
    • A. to retain the safranin dye
    • B. to retain the crystal violet dye during solvent treatment.
    • C. to retain part of both dyes
    • D. none of above
    • Discuss


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