Question 1

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

Accepted Answer

Saturated fatty acids have straight chains that allow tight packing, increasing van der Waals forces and melting point.

Question 2

A patient is prescribed an NSAID to reduce inflammation. Which mechanism best describes how NSAIDs work?

Accepted Answer

NSAIDs inhibit the cyclooxygenase (COX) enzymes, reducing the production of prostaglandins.

Question 3

Which of the following lipoproteins is primarily responsible for transporting cholesterol from the liver to peripheral tissues?

Accepted Answer

Low-density lipoprotein (LDL)

Question 4

Which equation correctly represents the hydrolysis of a triglyceride in the presence of water?

Accepted Answer

$$\mathrm{Triglyceride} + 3\ \mathrm{H_2O} \rightarrow 3\ \mathrm{Fatty\ Acid} + \mathrm{Glycerol}$$

Question 5

Which of the following statements about the solubility of fatty acids in water is correct?

Accepted Answer

Short-chain fatty acids are more soluble in water because their hydrophilic carboxyl group dominates.

Question 6

Which of the following is a correct classification for the amine in the molecule $$\mathrm{CH_3NHCH_2CH_3}$$?

Accepted Answer

Secondary amine

Question 7

A sample contains both amines and amides. Which test would best distinguish between them?

Accepted Answer

Test for basicity: Amines are basic and will turn red litmus paper blue, while amides are neutral.

Question 8

Which of the following correctly describes the structure of a steroid molecule?

Accepted Answer

Steroids are composed of four fused rings: three cyclohexane and one cyclopentane.

Question 9

Which of the following reactions best represents the formation of an amide from a carboxylic acid and an amine?

Accepted Answer

$$\mathrm{Carboxylic\ Acid} + \mathrm{Amine} \rightarrow \mathrm{Amide} + \mathrm{H_2O}$$

Question 10

Which property of amines makes them useful in pharmaceutical applications?

Accepted Answer

Amines are basic and can form salts with acids, improving drug solubility and absorption.

Question 11

Which of the following statements about cholesterol is correct?

Accepted Answer

Cholesterol is a steroid that is a precursor for hormones such as estrogen and testosterone.

Question 12

A triglyceride undergoes hydrolysis in the presence of a strong base. What is the name of this reaction and what are the products?

Accepted Answer

Saponification; fatty acid salts and glycerol

Question 13

Which of the following best describes the difference between LDL and HDL cholesterol?

Accepted Answer

HDL removes cholesterol from tissues and transports it to the liver for excretion, while LDL delivers cholesterol to tissues.

Question 14

Which of the following amines is a tertiary amine?

Accepted Answer

$$\mathrm{(CH_3$)_3N}$$

Question 15

Which factor most strongly affects the boiling point of amines?

Accepted Answer

Presence of hydrogen bonding between amine molecules

Question 16

Which of the following is a correct IUPAC name for a secondary amine with the formula $$\mathrm{CH_3NHCH_2CH_3}$$?

Accepted Answer

N-methylethanamine

Question 17

Which of the following statements about the structure of fatty acids is correct?

Accepted Answer

Fatty acids consist of a long hydrocarbon chain with a terminal carboxyl group.

Question 18

Which of the following reactions occurs when an amine reacts with an acid?

Accepted Answer

$$\mathrm{Amine} + \mathrm{Acid} \rightarrow \mathrm{Ammonium\ Salt}$$

Question 19

Which of the following is a correct statement about the function of lipids in biological systems?

Accepted Answer

Lipids serve as energy storage, insulation, and components of cell membranes.

General Chemistry Study Guide: Lipids, Fatty Acids, and Amines/Amides

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