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few problems to be solved? can you do it?

Discussion in 'DAT Discussions' started by Dencology, Jun 16, 2008.

  1. Dencology

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    Guys please explain your answers as you try to answer each of these questions.
    1. What is the stroke vol. of a patient exhibiting a systolic of 320ml and diastolic of 40ml?

    • 10L
    • 280mL
    • 1.4L
    • 40mL
    Is the ans: Cardiac output= Heart rate × stroke volume
    I am not sure of the answer.
    2. father is color blind(rg+) and mother is unknown. They had two children, one boy who was coloreblind and one girl who was normal. What are the parents genotypes?



    • Xrg+ Y; Xrg+ Xrg
    • Xrg Y; Xrg+ Xrg
    • Xrg+ Y; Xrg+Xrg+
    • Xrg+ Y; Xrg Xrg
    3. what is located in the stomach and is associated with the mucus lining of the stomach?

    4. What is the role of plasmids in recombinant DNA?

    5. At what embryonic stage does embryo implant into the uterus?
    a. zygote
    b. 16 cell stage (this is probably the same as choice d)

    c. fertilization
    d. morula
    e. blastula

    6. Mesenchymal tooth cell from a dunkey were extracted and injected into a bird embryos, and the bird grew teeth. What is the situation described representing?
    I think it would be artificial insemination. What you guys think?

    7. what is the difference b/w an animal cell and a bacterial cell?

    8. if a disease exhibits autosomal recessive characteristics, which of the following situations will not occur?
    a. 2 homozygous dominant parents have a boy who inherits the disease
    b. 2 heterozygote parents have a boy who inherits the disease.

    9. which one measures volume the best accurate?
    a. burret
    b. graduated cylinder
    c. flask

    10. if you have a benzene ring with a carboxylic acid attached to it in a mixture with CH3CH2CH2NH2. what solvent can you use to separate?
    a. NaCl
    b. HCl
    c. NaOH

    11. what is the rate constant dependent on?
    a. temp
    b. [reactant]
    c. [product]
    d. density

    12.also, how do we know when to use permutation and combination?
    13.is AlCl3 a polar or a nonpolar? Also does it have a net dipole moment or not? what about HCCl3 does it have a net dipole moment?

    14. in which tow compounds does sulfur have the same oxidation state?
    a. H2SO4 and SOCl2
    b. H2SO3 and SOCl2
    in the a. S is +6 and what? in b. S is +4 and what?
     
    #1 Dencology, Jun 16, 2008
    Last edited: Jun 16, 2008
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  3. ADentalHopeful

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    11.[reactant]
    12. Permutation=order matters.. ex. comittee 8 ppl, person is leader, another must be the coffee buyer, another is such and such...

    13. AlCl3 polar, no net dipole.
    HCCl3 polar with net dipole?
     
  4. osimsDDS

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    hope that helps
     
    #3 osimsDDS, Jun 16, 2008
    Last edited: Jun 16, 2008
  5. Dencology

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    can yo explain your answers please?
     
  6. baedero1

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    9. which one measures volume the best accurate?
    a. burret
    b. graduated cylinder
    c. flask

    10. if you have a benzene ring with a carboxylic acid attached to it in a mixture with CH3CH2CH2NH2. what solvent can you use to separate?
    a. NaCl
    b. HCl
    c. NaOH
     
  7. wkawk2416

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    1. What is the stroke vol. of a patient exhibiting a systolic of 320ml and diastolic of 40ml?

    • 10L
    • 280mL
    • 1.4L
    • 40mL
    simply 320 - 40 = 280

    the differences b/w systolic and diastolic describe amount of blood that heart can hold b/w the phase.

    which make sense to me, but i don't know I just made things up. so please correct me if i am wrong

    4. What is the role of plasmids in recombinant DNA?

    plasmids are used as vectors which can be modified by using restriction enzymes.

    think about what rDNA is. rDNA forms when a gene of interest (could be product of PCR) is inserted and relygated with the same restriction enzyme into the vector which in this case is plasmid from e.coli and both (gene of interest and plasmid have to be present to be called rDNA). This process is examined thru not conjugation, but transformation. You reinsert rDNA into the e.coli and let them grow on the plate that was treated with ampicillin to see if the insertion was successful or not.(you can figure out by the color of colonies). and then you can do whatever you want (ex cloning).
     
    #6 wkawk2416, Jun 16, 2008
    Last edited: Jun 16, 2008
  8. osimsDDS

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    are you going to post the answers??? thanks
     
  9. doc toothache

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    a. +6, +4
    b. +4, +4
     
  10. Dencology

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    i don't have the answers. but it seems that not a lot of people can answer these questions. what is going on?
     
  11. smile101

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    answers in blue
     
    #10 smile101, Jun 17, 2008
    Last edited: Jun 17, 2008
  12. doc toothache

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    The question is poorly worded since neither NaCl nor NaOH are solvents.

    NaOH
    Benzoic (carboxylic) acid(s) will react with NaOH to give sodium benzoate, a salt which is soluble in water. Propylamine is only very slightly soluble in water. A classic separation technique using the difference in the solubility characteristics between acids, bases and their salts either in a single or double phase system.
     
  13. osimsDDS

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    I believe after the sodium benzoate is soluble in water and you use separatory funnel to extract the water + the salt you can use filtration to extract the salt from the water...

    All I know is that when you are trying to separate two compounds, 1 being acidic you would use a base because its like a neutralization reaction where it produces a salt which is soluble in water...it will be in water and then you use filtration to take the salt out from the water...tis in kaplan blue book orgo section...
     
  14. smile101

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    Why can't you use HCl??
    HCl can react with propylamine and separate the two...ain't it???
     
  15. sl2obel2ts

    sl2obel2ts i like tomatoes
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    i think it is NaOH I read it somewhere in kaplan.
     
  16. doc toothache

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    Good question. You can use HCl as a separation technique for amines, which react with HCl to give quarternary ammonium salts, which are water soluble. In fact, some alkaloids when used as medicinal products are made soluble by making the chloride salt.
     
    #15 doc toothache, Jun 17, 2008
    Last edited: Jun 20, 2008
  17. DRHOYA

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    I'm not sure how complicated it is, but what I always thought was a basic rule is if you have an acid and want to separate, use a base and vice-versa. Since NaOH was the only base, I'm guessing thats the correct one??? Idk
     

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