some ?'s from my practice DAT today

Discussion in 'Pre-Dental' started by vixen, Aug 3, 2002.

  1. vixen

    vixen I like members

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    1) what's a planaria? It was mentioned in a question.

    2) also, lacteals absorb:
    A) carb's
    B) proteins
    C) fatty acids
    D) salts
    E)water

    answer is C. I put A...wasnt sure why.

    3) which selection most likely leads to speciation?
    A) directional selection
    B) disruptive selection
    C) sexual selection
    D) stabilizing selection

    answer is B....I thought it was B, what is "disruptive selection"?

    4) when empty, the mass of a beaker is 115g. when filled w/300mL of an unknown liquid, the combined mass is 427g. what volume (in mL) would 1kg of the liquid occupy?

    A) (300)(1000)/(427-115)
    B) (300)(1000)(427-115)
    C) 300/427
    D) 300/(427-115)

    answer is A....dont why youd multiply by 1000 first...

    5) which of the following is not a good conductor of electricity?
    A) Fe (s)
    B) NaCl (aq)
    C) NaCl (l)
    D) NaCl (s)
    E) Cu (s)

    Answer is D. I dont know why

    6) Which of the following compounds is not capable of hydrogen bonding?
    A) C4H11N
    B) C4H9NO
    C) C4H7F3
    D) C4H8O2
    E) C4H10O

    answer is C. I remembered that FON can hydrogen bond, so why can't C?

    7) Which of the following cmps may be classified as a protic solvent?
    A) diethyl ether
    B) n-hexane
    C) acetone
    D) ethanol
    E) nitrobenzene

    answer is D. is this just knowing which things are protic and which aren't....i can't remember for my life.
     
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  3. DesiDentist

    DesiDentist G. S. Khurana, DMD, MBA
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    Hope this helps. How did you do otherwise on the practice exam?

    DesiDentist
     
  4. vixen

    vixen I like members

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    yeah! thanks desi!!! :clap:
     
  5. Dentalstu02

    Dentalstu02 Member

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    For #4,
    Think of it as a ratio, 300ml per (427-115)g. Or 300ml/312g. This value gives the milliliters per gram (look at the units). SO for 1000 grams (1 kilogram) we just multiply by 1000g. SO we get (1000)(300)/(312)
    I hope this makes sense...
     
  6. DesiDentist

    DesiDentist G. S. Khurana, DMD, MBA
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    Seema,

    I just got it. Planaria is a flat worm.

    DesiDentist
     
  7. vixen

    vixen I like members

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    thanks guys. :)
     

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