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Home Microbiology Viruses From Animal and Plants Comments

  • Question
  • Supercoiling refers to the extra turns in the structure of ds DNA due to the action of


  • Options
  • A. DNA gyrase
  • B. DNA pyrase
  • C. RNA gyrase
  • D. RNA pyrase

  • Correct Answer
  • DNA gyrase 


  • Viruses From Animal and Plants problems


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    • 1. Which of the following virus is transmitted by genital route?

    • Options
    • A. Papillomaviruses
    • B. Herpes simplex virus type 2
    • C. Hepatitis B virus
    • D. All of these
    • Discuss
    • 2. Negative strand ssRNA viruses need to have a preformed replicase when they invade a mammalian cell because they

    • Options
    • A. use it to terminate transcripts when they copy host cell mRNA
    • B. have to make a positive strand copy that can be translated
    • C. use it to modify host enzymes that are recruited for viral replication
    • D. none of the above
    • Discuss
    • 3. Icosahedral viruses are generally

    • Options
    • A. polio viruses
    • B. adeno viruses
    • C. both (a) and (b)
    • D. none of these
    • Discuss
    • 4. Plant viruses penetrate host cells through transient ores called

    • Options
    • A. ectodesmata
    • B. endodesmata
    • C. cytodesmata
    • D. protodesmata
    • Discuss
    • 5. Fluorescence microscopy can be used for the diagnosis of

    • Options
    • A. Subacute sclerosing panencephalitis
    • B. Herpes simplex encephalitis
    • C. Rabies
    • D. All of these
    • Discuss
    • 6. Which of the following virus is transmitted by the respiratory route?

    • Options
    • A. Rhinovirus
    • B. Coronavirus
    • C. Measles virus
    • D. All of these
    • Discuss
    • 7. Transfer of infection from cell to cell occurs mainly by direct transfer of virions via

    • Options
    • A. plasmodesmata
    • B. cytodesmata
    • C. protodesmata
    • D. none of these
    • Discuss
    • 8. The tissue structure deteriorates as the virus multiplies. This deterioration is called

    • Options
    • A. aneuploidy
    • B. protopathic effect
    • C. cytopathic effect
    • D. none of these
    • Discuss
    • 9. What does the positive strand in double stranded RNA viruses stands for?

    • Options
    • A. rRNA
    • B. tRNA
    • C. mRNA
    • D. None of these
    • Discuss
    • 10. The reovirus and influenza virus contain

    • Options
    • A. 10 different segments of dsRNA and 8 different segments of ssRNA respectively
    • B. 8 different segments of dsRNA and 10 different segments of ssRNA respectively
    • C. 5 different segments of dsRNA and 7 different segments of ssRNA respectively
    • D. 7 different segments of dsRNA and 5different segments of ssRNA respectively
    • Discuss


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