Question 1

Which process is depicted in the first image, and what is its biological significance?

Accepted Answer

Dehydration synthesis; it is used to build macromolecules from smaller subunits by removing water.

Question 2

Refer to the second image. Which chemical reaction is illustrated, and what is the main outcome of this process?

Accepted Answer

Hydrolysis; breakdown of polysaccharides into monosaccharides, releasing energy.

Question 3

The third image shows the formation of a triglyceride. Which type of reaction is responsible for this process, and what are the reactants?

Accepted Answer

Dehydration synthesis; glycerol and three fatty acids.

Question 4

Which type of fat is depicted in the fourth image, and what is a key characteristic of its structure?

Accepted Answer

Saturated fat; contains only single bonds, resulting in straight tails.

Question 5

The fifth image shows a triglyceride with kinked tails. What causes these kinks, and what is the physical state of this fat at room temperature?

Accepted Answer

Presence of double bonds; liquid at room temperature.

Question 6

In the sixth image, which macromolecule is illustrated, and what is its primary function in cells?

Accepted Answer

Phospholipid; forms the primary structure of cell membranes.

Question 7

Which of the following best describes the difference between saturated and unsaturated fatty acids, as shown in the images?

Accepted Answer

Saturated fatty acids have only single bonds and are straight, while unsaturated fatty acids have at least one double bond and are kinked.

Question 8

Which process requires the input of energy and results in the formation of water as a byproduct?

Accepted Answer

Dehydration synthesis

Question 9

A patient is unable to digest lactose due to a deficiency in the enzyme lactase. Which type of reaction is impaired in this patient?

Accepted Answer

Hydrolysis of lactose

Question 10

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a polar head and two nonpolar tails, making them essential for cell membrane structure.

Question 11

Which macromolecule is primarily responsible for storing genetic information in cells?

Accepted Answer

Nucleic acids

Question 12

Which of the following is a correct example of a disaccharide and its monosaccharide components?

Accepted Answer

Sucrose; glucose + fructose

Question 13

Which polysaccharide is used for energy storage in animals, and what is its structural characteristic?

Accepted Answer

Glycogen; highly branched chains

Question 14

Which of the following best explains why saturated fats are solid at room temperature?

Accepted Answer

Their fatty acid tails are straight, allowing them to pack closely together.

Question 15

Which of the following is NOT a function of carbohydrates in living organisms?

Accepted Answer

Enzyme catalysis

Question 16

A scientist is studying a molecule with a backbone of three six-membered rings and one five-membered ring. Which class of macromolecule is this, and what is a common example?

Accepted Answer

Steroid; cholesterol

Question 17

Which of the following equations correctly represents the dehydration synthesis of two glucose molecules to form maltose?

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 18

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

Accepted Answer

They have both hydrophilic and hydrophobic regions.

Question 19

Which of the following is a correct statement about the role of hydrolysis in digestion?

Accepted Answer

Hydrolysis breaks down macromolecules into smaller subunits, releasing energy.

Macromolecules: Structure, Formation, and Biological Roles

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