The cell membrane is comprised of a class of these molecules with a phosphate head group and two fatty acid tails. For 10 points each:
[10e] Name these organic macromolecules that include waxes, sterols, and fats.
ANSWER: lipids [accept phospholipids]
[10m] Fatty acids are broken down by beta-oxidation—two carbons at a time—to produce this molecule. Oxaloacetate condenses with this molecule in the first step of the citric acid cycle.
ANSWER: acetyl-CoA [or acetyl-coenzyme A]
[10h] The final step of beta oxidation forms one of these functional groups between an acyl group and Coenzyme A. Fatty acids are activated by joining them to a CoA molecule via one of these high-energy groups.
ANSWER: thioester [reject "thiol" or “ester”]
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