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Another Bio problem

Discussion in 'DAT Discussions' started by Lonely Sol, Apr 6, 2007.

  1. Lonely Sol

    Lonely Sol cowgoesmoo fan! 10+ Year Member

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    Dec 13, 2005
    Atlanta, GA
    alright, I got one bio question that seems tricky ....here is the question

    which of the following molecules is capable of generating the greatest osmotic pressure?
    1) 300 mM glucose
    2)300 mM urea
    3) 300 mM NaCl




    2. A drug blocks electron transfer in cytochrome oxidase (Complex IV). If intact mitochondria were incubated with excess NADJ and O2 in the presence of the drug, which of the following would be found only in the oxidized state?
    a. Coenzyme Q
    b. Cytochrome a3
    c. Cytochrome b
    d. cytomchrome C1
    e. Fe-S centers in succinate dehydrogenase


    Also, Is it true that Bacteria have both DNA and RNA? (thats was schaums book said).

    i don't have any answer to that....If you could help me out with this Question that would be great.
    thanks in advance
     
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  3. poc91nc

    poc91nc Banned Banned 7+ Year Member

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    Nov 5, 2006
    Why shouldn't Bacteria have RNA? What are ribosomes composed of? Do bacteria have ribosomes?

    Can't offer any suggestions for the ETC question...look in voet and voet for the answer

    hmmm....what is the equation for osmotic pressure? What is it about that equation that many people always always seem to forget? (van't hoff???) At least that is how I would approach the problem
     
  4. poc91nc

    poc91nc Banned Banned 7+ Year Member

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    Nov 5, 2006
    NaCl will have an effective concentration double that of the other two solutes.
     
  5. Lonely Sol

    Lonely Sol cowgoesmoo fan! 10+ Year Member

    684
    0
    Dec 13, 2005
    Atlanta, GA
    yea, i guess thats probably the common mistake I would make, forget about van't hoff. Yea, if you look at it that way then only NaCl will give you the higher osmotic pressure!! Thanks, poc!
     

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