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(4) (10 points total) Note ? there are multiple correct responses for this quest

ID: 807823 • Letter: #

Question

(4) (10 points total) Note ? there are multiple correct responses for this question. Just be sure to explicitly defend whatever response you decide to go with in an organized and brief manner. Remember: Use complete sentences! The structure of dipalmitoylphosphatidylcholine (DPPC), a phospholipid, is shown (note the positive charge on the N atom of the choline group and the negative charge on the O atom of the phosphate group): DPPC is an important molecule in biology and is a major component in the lining of your lungs. (a) Predict the structure of a mixture of DPPC in water and briefly explain your answer in terms of the intermolecular forces involved (you may use a picture to aid in your response).

Explanation / Answer

Answer

Water being a polar molecule will facilitate the packing of DPPC molecules through H-bonding and ionic interactions. The arrangement of DPPC chains may look something like shown in the figure - a zig-zag type arrangement N+ ion of one chain interacting with P-O- of neighbouring chain.