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Melting Point of Acid; Structures of Compounds; Triglycerol; Bacteria; Membrane Lipids

1. Does trans-oleic acid have a higher or lower melting point than cis-oleic acid? Why? Explain in detail.

2. Draw the structure of 1-palmitoyl-2-oleoyl-3-phospatidylserine.

3. Why can't triglycerols (fats) be significant components of membranes?

4. When bacteria growing at 20 degree celsius are warmed to 30 degree celsius, are they more likely to synthesize membrane lipids with...
a. saturated or unsaturated fatty acids? Explain why.
b. short-chain or long chain fatty acids? Explain why.

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Solution Preview

1. Melting point is related to the crystal lattice structure of the substance under consideration. So, the question really is, "Which fatty acid packs together more tightly?" Trans-oleic acid is more straight. The trans-double bond doesn't put a kink into the tail as does a cis-double bond. (You might want to look up in your textbook or on the web for graphics of trans and cis fatty acids to see this phenomenon.) Cis-oleic acid is bent. It has a kink in it because of the cis double bond. Therefore, trans-oleic acid can pack together more tightly than cis-oleic ...

Solution Summary

Three questions are answered in paragraph form for a total of a 350 word response, while question two is answered in an attachment via a diagram.