Question 1

Which of the following best explains why unsaturated fatty acids are typically liquid at room temperature, while saturated fatty acids are solid?

Accepted Answer

Unsaturated fatty acids have bent chains due to double bonds, preventing tight packing.

Question 2

Which of the following foods is highest in monounsaturated fats, based on the images provided?

Accepted Answer

Avocado

Question 3

A triglyceride is formed by the esterification of which two types of molecules?

Accepted Answer

Glycerol and three fatty acids

Question 4

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a hydrophilic head and two hydrophobic tails.

Question 5

Which of the following is a polyunsaturated fatty acid?

Accepted Answer

Linolenic acid

Question 6

What is the general formula for a saturated fatty acid?

Accepted Answer

$$\mathrm{CH_3$(CH_2$)_nCOOH}$$, where $$n is $$even

Question 7

Which process is used to convert unsaturated fats into saturated fats, making them more solid at room temperature?

Accepted Answer

Hydrogenation

Question 8

Which of the following is a major health risk associated with excessive intake of saturated fats?

Accepted Answer

Atherosclerosis

Question 9

Which of the following best describes the structure of a soap molecule?

Accepted Answer

A long non-polar tail and a polar head

Question 10

Which of the following statements about omega-3 and omega-6 fatty acids is correct?

Accepted Answer

Omega-3 fatty acids have their first double bond at the third carbon from the tail.

Question 11

Which of the following is a function of cholesterol in the body?

Accepted Answer

It is a precursor for sex hormones and vitamin D.

Question 12

Which of the following best explains why animal fats are generally solid at room temperature while plant oils are liquid?

Accepted Answer

Animal fats are mostly saturated, while plant oils are mostly unsaturated.

Question 13

Which reaction describes the breakdown of a triglyceride into glycerol and fatty acids in the presence of a strong base?

Accepted Answer

Saponification

Question 14

Which of the following is a correct statement about the melting point of lipids?

Accepted Answer

Saturated fatty acids have higher melting points than unsaturated fatty acids.

Question 15

Which of the following is a real-life application of the amphipathic nature of phospholipids?

Accepted Answer

Formation of cell membranes

Question 16

A patient is advised to increase their intake of omega-3 fatty acids. Which food would be most beneficial?

Accepted Answer

Cold water fish

Question 17

Which of the following best describes the chemical reaction that occurs when bromine ($$\mathrm{Br_2$}) is $$added to an unsaturated fatty acid?

Accepted Answer

An addition reaction occurs at the double bond.

Question 18

Which of the following is a consequence of lipid accumulation in the liver and muscle, as shown in the diagram?

Accepted Answer

Insulin resistance and inflammation

Question 19

Which of the following best explains why trans fats are considered unhealthy?

Accepted Answer

They are more difficult for the body to break down and increase the risk of heart disease.

Question 20

Which of the following is a correct description of the structure of stearic acid?

Accepted Answer

A saturated fatty acid with 18 carbon atoms and no double bonds

Lipids: Structure, Types, and Biological Roles

Study Guide - Practice Questions