AP Biology 1.1 Biological System Interactions
AP Biology: Biological System Interactions Drill 1, Problem 1. Complete the sentence about a saturated fatty acid.
|AP Biology||Biological System Interactions|
|Test Prep||AP Biology|
Yeah, okay...we should probably be referring to these things as "slightly overweight acids"
or "big-boned acids."
Hopefully we don't get a bunch of angry letters. But we'll take our chances.
Okay, so aside from the fact that saturated fats are usually derived from animals, such
as meat and dairy...
...and unsaturated fats come from vegetables and plants...
...the more important distinction between them is their chemical composition.
Saturated fatty acids have single carbon-hydrogen bonds...whereas unsaturated fatty acids have double bonds.
So B is true.
And if we look at the diagram, both fatty acids also consist primarily of carbon and
hydrogen atoms, so C is also true.
Just from knowing that those two facts are true, we know answer choice D, all of the
above, must be our answer.
Ah, good old logic.
But... let's take a look at answer choice A just to make sure we understand it.
Hydro means water and phobic means fear, so...looks like hydrophobic means "scared of water."
And yes, saturated fatty acids are "scared" of water. Answer's D!
Incidentally, that fear of water can probably be traced back to that unfortunate cannonball
episode last summer...