Fats, Steroids & Waxes Quiz and Flashcards

Questions and Answers

What do fats, steroids, and waxes have in common?

Both (a) and (c).

They occur in membranes.

Both (b) and (c).

Low solubility in water. (correct)

Moderate polarity.

What would a good student say to Dr. Haxton's statement about fats and phospholipids?

Nonpolar molecules aren't compatible with water.

The presence of many C-C and C-H bonds causes fats to be...

Insoluble in water.

Low in energy.

Both (b) and (c).

Rich in energy.

Both (a) and (b). (correct)

In fat synthesis, and fatty acids combine to make fats plus .

glycerol; water Signup and view all the answers

In the reaction that builds a fat, groups react with groups.

hydroxyl; carboxyl Signup and view all the answers

Triglycerides vary with respect to the number of...

Both (b) and (c). Signup and view all the answers

A food company hydrogenated a barrel of fat. The treatment...

Made the fat less fluid. Signup and view all the answers

The most unsaturated fats have...

the most double bonds. Signup and view all the answers

What do DNA, proteins, and fats have in common?

They contain carbonyl groups. Signup and view all the answers

Which of these is NOT a lipid?

RNA Signup and view all the answers

Which of these is rich in unsaturated fats?

Olive oil Signup and view all the answers

A function of cholesterol that does not harm health is its role _____.

as a component of animal cell membranes. Signup and view all the answers

Study Notes

Properties of Fats

Fats, steroids, and waxes are characterized by low solubility in water.
Nonpolar molecules like fats require phospholipids for transport in the bloodstream due to incompatibility with water.

Fat Structure and Synthesis

The structure of fats is rich in energy due to the high number of C-C and C-H bonds, making them insoluble in water.
Fats are synthesized from glycerol and fatty acids, producing fats and water during the reaction.
In fat synthesis, hydroxyl groups react with carboxyl groups.

Triglycerides and Unsaturation

Triglycerides vary in the number of carbon atoms and double bonds in their hydrocarbon tails.
Hydrogenation of fats results in reduced fluidity and potential increases in saturation, leading to fewer kinks in fatty acid tails.
The most unsaturated fats possess the highest number of double bonds.

Comparison with Other Biomolecules

DNA, proteins, and fats share the characteristic of containing carbonyl groups.
RNA is not classified as a lipid, unlike cholesterol, steroids, phospholipids, and waxes.

Dietary Fats

Olive oil is rich in unsaturated fats compared to butter, lard, and beef fat, which are primarily saturated fats.
Cholesterol plays a beneficial role as a component of animal cell membranes, despite common associations with health risks.

Description

This quiz focuses on the properties and functions of fats, steroids, and waxes in biological systems as covered in BIO 150. Test your understanding of lipid solubility and interactions with phospholipids. Suitable for students preparing for exams or reviewing key concepts in biology.