Question 1

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

Accepted Answer

Saturated fatty acids have straight chains that allow tight packing, while unsaturated fatty acids have kinks due to double bonds, preventing tight packing.

Question 2

A patient is found to have a deficiency in the enzyme responsible for dehydrogenation during fatty acid metabolism. Which process would be most directly affected?

Accepted Answer

Beta-oxidation of fatty acids

Question 3

Which of the following statements about triglycerides is correct?

Accepted Answer

Triglycerides are composed of three fatty acids esterified to a glycerol molecule.

Question 4

A researcher is studying the effect of trans fats on human health. Which structural feature distinguishes trans fats from cis fats?

Accepted Answer

Trans fats have hydrogen atoms on opposite sides of the double bond, resulting in a straighter chain.

Question 5

Which of the following best describes the amphipathic nature of phospholipids?

Accepted Answer

They have both hydrophilic (polar) heads and hydrophobic (nonpolar) tails.

Question 6

During the synthesis of nucleic acids, which type of bond forms between the phosphate group of one nucleotide and the sugar of the next?

Accepted Answer

Phosphodiester bond

Question 7

A mutation causes a cell to produce a nonfunctional enzyme involved in the synthesis of pyrimidines. Which of the following processes would be most directly impaired?

Accepted Answer

DNA replication

Question 8

Which of the following equations correctly represents the hydrolysis of a triglyceride?

Accepted Answer

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

Question 9

Which of the following best explains why cholesterol is considered an important molecule in animal cell membranes?

Accepted Answer

Cholesterol modulates membrane fluidity by preventing tight packing of phospholipids at low temperatures and restricting movement at high temperatures.

Question 10

A scientist is analyzing a sample of fatty acids and finds that the majority are long, straight chains with no double bonds. Which type of fatty acid is most likely present?

Accepted Answer

Saturated fatty acids

Question 11

Which of the following is a correct statement about the structure of nucleotides in DNA?

Accepted Answer

Each nucleotide consists of a deoxyribose sugar, a phosphate group, and a nitrogenous base.

Question 12

Which of the following best describes the difference between a condensation (dehydration synthesis) and a hydrolysis reaction?

Accepted Answer

Condensation joins two molecules by removing water, while hydrolysis splits a molecule by adding water.

Question 13

A patient is diagnosed with a disorder that prevents the proper breakdown of lipids. Which of the following symptoms is most likely to occur as a direct result?

Accepted Answer

Accumulation of fat deposits in tissues

Question 14

Which of the following best explains why lipids are generally insoluble in water?

Accepted Answer

Lipids are nonpolar molecules and water is polar, so they do not mix.

Question 15

Which of the following is a correct representation of the general formula for a saturated fatty acid?

Accepted Answer

$$\mathrm{C_nH_{2n+1}COOH}$$

Question 16

A cell is exposed to a chemical that disrupts the formation of hydrogen bonds between complementary bases in DNA. Which process would be most directly affected?

Accepted Answer

Separation of DNA strands during replication

General Biology: Lipids, Nucleic Acids, and Related Biomolecules

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