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PSTV RNA and Prions Quiz
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PSTV RNA and Prions Quiz

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@ThumbsUpPixie

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Questions and Answers

Which bacterial strain was responsible for transforming the live R-type bacteria into a virulent form?

  • S-type
  • Dead S-type (correct)
  • R-type
  • Mixed infection

    • What can be concluded about the genetic material of bacteria based on the process of bacterial transformation described?

  • RNA is the genetic material
  • DNA is the genetic material (correct)
  • Lipids are the genetic material
  • Proteins are the genetic material

    • What did phage transfection experiments demonstrate about viruses?

  • DNA is the genetic material of viruses (correct)
  • Proteins are the genetic material of viruses
  • Carbohydrates are the genetic material of viruses
  • RNA is the genetic material of viruses

    • How was the transforming principle defined in the context of bacterial transformation?

    <p>DNA transferred between bacterial strains</p> Signup and view all the answers

    In phage infection experiments, what was observed when DNA and protein components of bacteriophages were labeled with different radioactive isotopes?

    <p>Only DNA was transmitted to progeny phages</p> Signup and view all the answers

    What property was exhibited by the virulent bacteria recovered from mixed infections?

    <p>Smooth coat</p> Signup and view all the answers

    What is the term used to describe the situation when a mutation in a second gene bypasses the effect of a mutation in the first gene?

    <p>Suppression</p> Signup and view all the answers

    What is the common cause of hotspots in genes?

    <p>Deamination of 5-methylcytosine</p> Signup and view all the answers

    Which type of hereditary agent is characterized as a small infectious nucleic acid without a protein coat?

    <p>Viroid</p> Signup and view all the answers

    What type of mutation increases the virulence of the viroid PSTV (potato spindle tuber viroid)?

    <p>Substitution</p> Signup and view all the answers

    Which of the following statements is true regarding deamination of cytosine and 5-methylcytosine?

    <p>Deamination of cytosine produces uracil, while deamination of 5-methylcytosine produces thymine.</p> Signup and view all the answers

    What term describes some very small hereditary agents that do not encode polypeptides but consist of RNA or protein with heritable properties?

    <p>Viroid</p> Signup and view all the answers

    What is the function of a gene?

    <p>To encode RNAs or polypeptides</p> Signup and view all the answers

    In what form is the PrP protein found in normal brain cells?

    <p>PrPc and completely degraded by proteases</p> Signup and view all the answers

    Which disease is similar to scrapie in sheep and goats?

    <p>Creutzfeldt-Jakob disease</p> Signup and view all the answers

    What is the relationship between genes and alleles?

    <p>Alleles are alternative forms of genes at specific locations</p> Signup and view all the answers

    What is the abnormal three-dimensional structure of PrPsc suspected of causing?

    <p>Infectious properties</p> Signup and view all the answers

    What was Mendel's recognition of a gene nearly 150 years ago?

    <p>'Particulate factor' that passes largely unchanged from parent to progeny</p> Signup and view all the answers

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