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AP Biology 1.1 Biological System Interactions
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AP Biology: Biological System Interactions Drill 1, Problem 1. Complete the sentence about a saturated fatty acid.

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AP Biology: Biological System Interactions Drill 1, Problem 1. Complete the sentence about a saturated fatty acid.

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Transcript

00:03

Here's your shmoop du jour, brought to you by fatty acids.

00:07

But rest assured...their diet starts tomorrow.

00:12

Complete the following:

00:13

A saturated fatty acid...?

00:17

And here are the potential answers...

00:25

Yeah, okay...we should probably be referring to these things as "slightly overweight acids"

00:30

or "big-boned acids."

00:36

Hopefully we don't get a bunch of angry letters. But we'll take our chances.

00:40

Okay, so aside from the fact that saturated fats are usually derived from animals, such

00:44

as meat and dairy...

00:45

...and unsaturated fats come from vegetables and plants...

00:50

...the more important distinction between them is their chemical composition.

00:57

Saturated fatty acids have single carbon-hydrogen bonds...whereas unsaturated fatty acids have double bonds.

01:08

So B is true.

01:09

And if we look at the diagram, both fatty acids also consist primarily of carbon and

01:14

hydrogen atoms, so C is also true.

01:18

Just from knowing that those two facts are true, we know answer choice D, all of the

01:24

above, must be our answer.

01:25

Ah, good old logic.

01:26

But... let's take a look at answer choice A just to make sure we understand it.

01:31

Hydro means water and phobic means fear, so...looks like hydrophobic means "scared of water."

01:39

And yes, saturated fatty acids are "scared" of water. Answer's D!

01:47

Incidentally, that fear of water can probably be traced back to that unfortunate cannonball

01:52

episode last summer...

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