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Introduction to Lipids

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Questions and Answers

What is the primary functional property of the covalent bond between oxygen and hydrogen in acetic acid?

The bond is so nonpolar that hydrogen ions (H+) tend to dissociate reversibly.

The bond is so polar that hydrogen ions (H+) tend to dissociate reversibly. (correct)

The bond is so polar that hydrogen ions (H+) tend to dissociate irreversibly.

The bond is so nonpolar that hydrogen ions (H+) tend to dissociate irreversibly.

In cells, where is acetic acid found in its ionic form?

In the cytoplasm.

In the carboxylate group. (correct)

In the nucleus.

In the mitochondria.

What is the name of the class of compounds that acetic acid belongs to?

Carboxylic acids. (correct)

Alcohols.

Ketones.

Alkanes.

What property of acetic acid is responsible for the sour taste of vinegar?

Its high concentration of hydrogen ions. (D) Signup and view all the answers

What type of reaction is involved in the synthesis of a fat molecule (triacylglycerol) from glycerol and fatty acids?

Dehydration. (D) Signup and view all the answers

How can triglycerides be formed from a mix of different fatty acids?

By adding different fatty acids to the glycerol backbone. (B) Signup and view all the answers

What is the unifying feature of lipids?

Having little or no affinity for water (C) Signup and view all the answers

Which of the following is NOT one of the most biologically important lipids?

Carbohydrates (B) Signup and view all the answers

What are the components of a triacylglyceride molecule?

One molecule of glycerol and three molecules of fatty acids (C) Signup and view all the answers

What is the functional property of alcohol groups (-OH) in biological molecules?

They are polar and attract water molecules, helping dissolve organic compounds (B) Signup and view all the answers

Which of the following molecules contains a carboxylic acid group?

Serine (A) Signup and view all the answers

Which of the following statements about the solubility of n-alkanes in water is true?

The solubility of n-alkanes in water decreases with increasing chain length (C) Signup and view all the answers