any one could help answer these questions, please

Discussion in 'NBDE Exams & Licensure Exams' started by stickto, Jun 15, 2008.

  1. stickto

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    [FONT=Times New Roman, serif]any one could help answer these questions, please.



    [FONT=Times New Roman, serif]166. Which of the following proteins is involved with bacterial aggregation and subsequent elimination from the oral cavity?.
    1. [FONT=Times New Roman, serif]a.Gustin.
      [FONT=Times New Roman, serif]b. statherin.
      [FONT=Times New Roman, serif]c. lactoferrin.
      [FONT=Times New Roman, serif]d. Secretory IgA.
    [FONT=Times New Roman, serif]178. Which of the following describes a major effect of sickle cell anemia?.


    [FONT=Times New Roman, serif]a. Absence of biphosphoglycerate binding of hemoglobin.
    1. [FONT=Times New Roman, serif]b. Substitution of 2 proximal histidines.
    2. [FONT=Times New Roman, serif]Decreased solubility of the deoxy form of hemoglobin.
      [FONT=Times New Roman, serif]d. A P50 value for hemoglobin similar to that of myoglobin.
      [FONT=Times New Roman, serif]e. Decreased number of subunits in hemoglobin.
    Here are several more questions, Which I don't have clear answers. Someone please help

    [FONT=Times New Roman, serif]9 Each of the following viruses is potentially capable of causing cell transformation EXCEPT one. Which one is this EXCEPTION?.


    [FONT=Times New Roman, serif]A Retrovirus.
    [FONT=Times New Roman, serif]B Herpesvirus.
    [FONT=Times New Roman, serif]C Picornavirus.
    [FONT=Times New Roman, serif]D Hepatitis B virus.
    [FONT=Times New Roman, serif]E Human papillomavirus.


    [FONT=Times New Roman, serif]22 Integration of the F factor plasmid into the chromosome?.


    [FONT=Times New Roman, serif]A Is essential in order for the chromosome to be transferred during conjugation.
    [FONT=Times New Roman, serif]B Is essential in order for the F factor to be transferred during conjugation.
    [FONT=Times New Roman, serif]C leads to the formation of F pill.
    [FONT=Times New Roman, serif]D produces a mutation.


    [FONT=Times New Roman, serif]26 Each of the following conditions involves changes in numbers of cells in an organ or tissue EXCEPT one. Which one is the this EXCEPTION?.


    [FONT=Times New Roman, serif]A Aplasia.
    [FONT=Times New Roman, serif]B Hyperplasia.
    [FONT=Times New Roman, serif]C Hypoplasia.
    [FONT=Times New Roman, serif]D Metaplasia.


    [FONT=Times New Roman, serif]40 Neurofibromatosis Type I is characterized by which of the following conditions?.
    [FONT=Times New Roman, serif]A Multiple mucosal neuromas.
    [FONT=Times New Roman, serif]B Perioral melanotic freckles.
    [FONT=Times New Roman, serif]C Multiple schwannomas of the skin.
    [FONT=Times New Roman, serif]D Development of visceral carcinoma.
    [FONT=Times New Roman, serif]E Multiple pigmented macules of the skin.


    [FONT=Times New Roman, serif]73 The biologic effect of exotoxin A produced by Pseudomonas aeruginoses is to.
    [FONT=Times New Roman, serif]A induce shock.
    [FONT=Times New Roman, serif]B inactivate IgG.
    [FONT=Times New Roman, serif]C Inhibit protein synthesis.
    [FONT=Times New Roman, serif]D Increase levels of cAMP.
    [FONT=Times New Roman, serif]E inhibit neutrophil function.
     
    #1 stickto, Jun 15, 2008
    Last edited: Jun 15, 2008
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  3. impaction

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  4. stickto

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    hi, I confused about 166 ,because the lactoferrin (answer c) will aggregation and elimination the bacterior, but the SIgA only aggregate the bacterior.

    would you also please explain the 178 ?
     
  5. shuntyman

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    [FONT=Times New Roman, serif]166. Which of the following proteins is involved with bacterial aggregation and subsequent elimination from the oral cavity?.
    1. [FONT=Times New Roman, serif]a.Gustin.
      [FONT=Times New Roman, serif]b. statherin.
      [FONT=Times New Roman, serif]c. lactoferrin.
      [FONT=Times New Roman, serif]d. Secretory IgA.
    [FONT=Times New Roman, serif]178. Which of the following describes a major effect of sickle cell anemia?.


    [FONT=Times New Roman, serif]a. Absence of biphosphoglycerate binding of hemoglobin.
    1. [FONT=Times New Roman, serif]b. Substitution of 2 proximal histidines.
    2. [FONT=Times New Roman, serif]Decreased solubility of the deoxy form of hemoglobin.
      [FONT=Times New Roman, serif]d. A P50 value for hemoglobin similar to that of myoglobin.
      [FONT=Times New Roman, serif]e. Decreased number of subunits in hemoglobin.
    Here are several more questions, Which I don't have clear answers. Someone please help

    [FONT=Times New Roman, serif]9 Each of the following viruses is potentially capable of causing cell transformation EXCEPT one. Which one is this EXCEPTION?.


    [FONT=Times New Roman, serif]A Retrovirus.
    [FONT=Times New Roman, serif]B Herpesvirus.
    [FONT=Times New Roman, serif]C Picornavirus.
    [FONT=Times New Roman, serif]D Hepatitis B virus.
    [FONT=Times New Roman, serif]E Human papillomavirus.


    [FONT=Times New Roman, serif]22 Integration of the F factor plasmid into the chromosome?.


    [FONT=Times New Roman, serif]A Is essential in order for the chromosome to be transferred during conjugation.
    [FONT=Times New Roman, serif]B Is essential in order for the F factor to be transferred during conjugation.
    [FONT=Times New Roman, serif]C leads to the formation of F pill.
    [FONT=Times New Roman, serif]D produces a mutation.


    [FONT=Times New Roman, serif]26 Each of the following conditions involves changes in numbers of cells in an organ or tissue EXCEPT one. Which one is the this EXCEPTION?.


    [FONT=Times New Roman, serif]A Aplasia.
    [FONT=Times New Roman, serif]B Hyperplasia.
    [FONT=Times New Roman, serif]C Hypoplasia.
    [FONT=Times New Roman, serif]D Metaplasia.


    [FONT=Times New Roman, serif]40 Neurofibromatosis Type I is characterized by which of the following conditions?.
    [FONT=Times New Roman, serif]A Multiple mucosal neuromas.
    [FONT=Times New Roman, serif]B Perioral melanotic freckles.
    [FONT=Times New Roman, serif]C Multiple schwannomas of the skin.
    [FONT=Times New Roman, serif]D Development of visceral carcinoma.
    [FONT=Times New Roman, serif]E Multiple pigmented macules of the skin.


    [FONT=Times New Roman, serif]73 The biologic effect of exotoxin A produced by Pseudomonas aeruginoses is to.
    [FONT=Times New Roman, serif]A induce shock.
    [FONT=Times New Roman, serif]B inactivate IgG.
    [FONT=Times New Roman, serif]C Inhibit protein synthesis.
    [FONT=Times New Roman, serif]D Increase levels of cAMP.
    [FONT=Times New Roman, serif]E inhibit neutrophil function.
     
  6. impaction

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    :smuggrin:
     
  7. shuntyman

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    [FONT=Times New Roman, serif]73 The biologic effect of exotoxin A produced by Pseudomonas aeruginoses is to.
    A induce shock
    [FONT=Times New Roman, serif]B inactivate IgG.
    [FONT=Times New Roman, serif]C Inhibit protein synthesis.
    [FONT=Times New Roman, serif]D Increase levels of cAMP.
    [FONT=Times New Roman, serif]E inhibit neutrophil function

    endotoxins produces shock and exotoxin A inhibits protein synthesis.
    .
     
  8. quest_life

    quest_life Member

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    22 Integration of the F factor plasmid into the chromosome?


    A Is essential in order for the chromosome to be transferred during conjugation
    B Is essential in order for the F factor to be transferred during conjugation (ANS)
    C leads to the formation of F pill
    D produces a mutation
     
  9. stickto

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    166. Which of the following proteins is involved with bacterial aggregation and subsequent elimination from the oral cavity?
    1. [FONT=Times New Roman, serif]a.Gustin.
      [FONT=Times New Roman, serif]b. statherin.
      [FONT=Times New Roman, serif]c. lactoferrin.
      [FONT=Times New Roman, serif]d. Secretory IgA.
    lactoferrin prevent aggregation and kill bacteria
    . Secretory IgA only prevent aggregation.
    according to the question,the answer is c. anybody can agree with me?

    [FONT=Times New Roman, serif]178. Which of the following describes a major effect of sickle cell anemia?.

    [FONT=Times New Roman, serif]a. Absence of biphosphoglycerate binding of hemoglobin.
    [FONT=Times New Roman, serif]b. Substitution of 2 proximal histidines.
    [FONT=Times New Roman, serif]c.Decreased solubility of the deoxy form of hemoglobin.
    [FONT=Times New Roman, serif]d. A P50 value for hemoglobin similar to that of myoglobin.
    [FONT=Times New Roman, serif]e. Decreased number of subunits in hemoglobin.

    still confusing about 178.
    in sickle cell anemia,valine replaces glutamate but not histidines why answer c is right?
     
  10. econservative

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    to impaction

    73 The biologic effect of exotoxin A produced by Pseudomonas aeruginoses is to
    A induce shock

    [FONT=Times New Roman, serif]B inactivate IgG.
    [FONT=Times New Roman, serif]C Inhibit protein synthesis.
    [FONT=Times New Roman, serif]D Increase levels of cAMP.
    [FONT=Times New Roman, serif]E inhibit neutrophil function.

    the answer should be inhibit protien synthesis, As the virulence factor exotoxin A act on ADP-ribosylate eukaryotic elongation factor 2 in the host cell.Without elongation factor 2, eukaryotic cells cannot synthesize proteins and necrose. So it leads to inhibition of protien synthesis ..:)
     
  11. econservative

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    plzz correct me if i am wrong ..
     
  12. dentinodent

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    well in the sickle cell anemia, the abnormal type of hemoglobin S contains faulty beta chains which when exposed to low concentratiom ofoxygen, it precipetates into long crystals inside the RBC these crystals elongate the cell and give it the appearance of a sickle rather than a biconcave disc. the precipitated hemoglobin also damages the cell membrane, so that the cells become highly fragile, leading to serious anemia. such patients frequently experience a vicious circle of events called a sickle cell disease crisis in which low oxygen tension in the tissue causes sickling , which leads to ruptured RBC , which causesa further decrease in Oxygen tensionand still more sickling and RBC distruction .
    '' ref. Gyton and Hall medical physiology 11th ed ... '' :)
     
  13. sleepyone

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    they are commonly known as cafe-au-lait spots and you need 6 or more that are 5 mm in kids or 15 in adults.

    check out ctf.org (childrens tumor foundation)
     
  14. njsmahal

    njsmahal DDS here i come

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  15. armorshell

    armorshell One Man Freak Show
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    F-plasmids only encode for F-pili. You guys such watch out for bandwagoning onto clearly wrong answers and possibly try actually researching things for yourself. It's much, much easier to type "F-plasmid" into google than it is to ask about it on here, and clearly the results are more accurate...

    http://en.wikipedia.org/wiki/F-plasmid
     
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  17. armorshell

    armorshell One Man Freak Show
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  18. drmcard

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    22 Integration of the F factor plasmid into the chromosome?


    A Is essential in order for the chromosome to be transferred during conjugation
    B Is essential in order for the F factor to be transferred during conjugation
    C leads to the formation of F pill
    D produces a mutation
    So whats the answer because some ppl say its B others say its E...
    Certain donor strains of bacteria transfer genes with high efficiency. In this case, the F factor acts as an episome and integrates itself into the bacterial chromosome. Under these conditions, chromosomal genes are transferred to the recipient cell, and the donor is called a high frequency of recombination (Hfr) donor. During normal conjugation, the donor cell can become a recipient cell if the F factor is transferred during the conjugation. However, during Hfr conjugation, the F factor is rarely transmitted, and the recipient cell does not become a donor cell. The exception occurs if the complete chromosome is transferred, a process requiring about 100 minutes in E. coli. In this case, the F factor is transferred and the recipient becomes a donor cell.
    Im comfused??? If a plasmid is integrated into a chromosome then wouldnt it cause a mutation???
     

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