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  1. #1
    Banned BlazinBCbud's Avatar
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    Guys good at Biology / Science, HALP!

    Any biologists in the house? What's the answer (serious)

    10. Triacylglycerols cannot form lipid bilayers because they
    a) have hydrophobic tails
    b) lack polar head groups
    c) cannot engage in hydrophobic interactions
    d) may contain unsaturated fatty acids

    thx misc.
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    Pretentious Music Guru InnocentThought's Avatar
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    I believe its B.

    Phospholipid bilayers have hydrophobic tails facing inside and polar heads facing outside.
    BU SMG '11
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    Registered User Fenex's Avatar
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    It's B. Triglycerides have three fatty acid tails and thus no polar headgroup to stabilize the outside of the bilayer with (compared to say phosphoglycerides).
    Last edited by Fenex; 12-03-2008 at 03:28 PM.
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    Banned BlazinBCbud's Avatar
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    Originally Posted by InnocentThought View Post
    I believe its B.

    Phospholipid bilayers have hydrophobic tails facing inside and polar heads facing outside.
    Seems to make sense thanks. Any good at chemistry?

    13. Which molecule or ion below is amphipathic?
    a) H2NCH2COOH
    b) H2O
    c) CH3(CH2)14COO
    d) CH3CH2CH2CH2CH3
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    Registered User Fenex's Avatar
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    Originally Posted by BlazinBCbud View Post
    Seems to make sense thanks. Any good at chemistry?

    13. Which molecule or ion below is amphipathic?
    a) H2NCH2COOH
    b) H2O
    c) CH3(CH2)14COO
    d) CH3CH2CH2CH2CH3
    C. The COO is hydrophilic while the CH3 is hydrophobic.
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    Hey im polish too Deathstriker666's Avatar
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    amphipathic = both polar and non polar sections.

    So its C, as it is carboxylic ion with a non-polar tail and a polar head which can ion di-pole bond with water.

    a is an amino acid, b is water and d is a hydrocarbon.
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    Wink

    Originally Posted by Fenex View Post
    C. The COO is hydrophilic while the CH3 is hydrophobic.
    Thank you very much good sir.

    one more chemistry?

    At the isoelectric pH of a neutral amino acid with two pKa values, the net charge will be
    a) 2
    b) 0.5
    c) 0
    d) Not enough information to determine
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