Question 1

Which of the following best describes the primary function of lipids in biological systems?

Accepted Answer

Long-term energy storage and insulation

Question 2

A triglyceride is formed by the dehydration synthesis of which molecules?

Accepted Answer

Three fatty acids and one glycerol

Question 3

Which structural feature distinguishes a saturated fatty acid from an unsaturated fatty acid?

Accepted Answer

Presence of double bonds between carbon atoms

Question 4

Which of the following statements about phospholipids is correct?

Accepted Answer

They have both hydrophilic and hydrophobic regions

Question 5

What is the main reason that phospholipids form bilayers in aqueous environments?

Accepted Answer

Their amphiphilic nature causes hydrophobic tails to avoid water and hydrophilic heads to interact with water

Question 6

Which of the following is a correct chemical formula for glucose, a common carbohydrate?

Accepted Answer

$$C_6H_{12}O_6$

Question 7

A patient is diagnosed with lactose intolerance. Which enzyme is most likely deficient in this individual, and what is the consequence at the molecular level?

Accepted Answer

Lactase; inability to hydrolyze lactose into glucose and galactose

Question 8

Which of the following best explains why unsaturated fats tend to be liquid at room temperature?

Accepted Answer

Their double bonds create kinks, preventing tight packing of molecules

Question 9

Which of the following is a function of cholesterol in animal cell membranes?

Accepted Answer

Providing structural support and fluidity to the membrane

Question 10

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose and is double-stranded; RNA contains ribose and is usually single-stranded

Question 11

A scientist is studying a molecule with the formula $$(CH_2O)_n. $$Which class of biological macromolecule does this formula most likely represent?

Accepted Answer

Carbohydrate

Question 12

Which of the following best explains why cells are small in size?

Accepted Answer

Smaller cells have a higher surface area to volume ratio, promoting efficient exchange of materials

Question 13

Which of the following is NOT a component of a nucleotide?

Accepted Answer

A fatty acid

Question 14

Which of the following statements about the structure of DNA is correct?

Accepted Answer

The strands are antiparallel and form a double helix

Question 15

Which of the following best describes the role of ribosomes in the cell?

Accepted Answer

They are responsible for protein synthesis

Question 16

A phospholipid differs from a triglyceride in which of the following ways?

Accepted Answer

A phospholipid has a phosphate group and two fatty acids, while a triglyceride has three fatty acids and no phosphate group

Question 17

Which of the following best explains the amphiphilic nature of phospholipids?

Accepted Answer

They have both a hydrophilic head and hydrophobic tails

Question 18

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Cytosine and guanine

Question 19

Which of the following best describes the process of hydrolysis in biological molecules?

Accepted Answer

It breaks a molecule apart by adding a water molecule

Question 20

A patient is prescribed penicillin to treat a bacterial infection. Which cellular structure does penicillin primarily target?

Accepted Answer

The cell wall

The Chemistry of Life: Lipids and Fats

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