Question 1

Which of the following statements best describes a polymer in biological systems?

Accepted Answer

A chain-like molecule formed from small, identical or similar monomers linked by covalent bonds.

Question 2

Which macromolecule is NOT considered a polymer?

Accepted Answer

Lipids

Question 3

What type of bond links monosaccharides together to form disaccharides and polysaccharides?

Accepted Answer

Glycosidic linkage

Question 4

Which of the following is the monomer unit of carbohydrates?

Accepted Answer

Monosaccharide

Question 5

A plant cell wall is primarily composed of which polysaccharide, and what is its main function?

Accepted Answer

Cellulose; structural support

Question 6

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

Accepted Answer

Their fatty acid chains are straight and can pack closely together.

Question 7

Phospholipids are essential for cell membrane structure because they are:

Accepted Answer

Amphipathic, containing both hydrophilic and hydrophobic regions

Question 8

Which of the following is a correct description of a glycosidic linkage?

Accepted Answer

A covalent bond formed between the hydroxyl groups of two monosaccharides.

Question 9

Which of the following equations correctly represents the general formula for a monosaccharide?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 10

A triglyceride is formed by the reaction of:

Accepted Answer

Three fatty acids and one glycerol molecule

Question 11

Which of the following is a function of polysaccharides in living organisms?

Accepted Answer

Providing energy storage and structural support

Question 12

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Both are composed of glucose monomers, but differ in the type of glycosidic linkage.

Question 13

Which of the following is true about the structure of phospholipids?

Accepted Answer

They contain a glycerol backbone, two fatty acids, and a phosphate group.

Question 14

Which of the following is a correct statement about the function of lipids in animals compared to plants?

Accepted Answer

Animals use fats more than plants for energy storage because fats are more efficient at storing energy.

Question 15

Which of the following is a defining feature of steroids?

Accepted Answer

They are composed of four fused carbon rings.

Question 16

Which of the following best describes an amphipathic molecule?

Accepted Answer

A molecule with both hydrophilic and hydrophobic regions.

Question 17

Which of the following is a real-world consequence of the structure of phospholipids?

Accepted Answer

They allow cell membranes to form bilayers that separate intracellular and extracellular environments.

Question 18

Which of the following is a correct multi-step reasoning about the role of glycosidic linkages in polysaccharides?

Accepted Answer

Glycosidic linkages determine the branching and digestibility of polysaccharides, affecting their biological function.

Question 19

Which of the following best explains why unsaturated fatty acids are liquid at room temperature?

Accepted Answer

They contain one or more double bonds that create kinks, preventing tight packing.

Question 20

Which of the following is a correct application of the concept of monomers and polymers in a medical context?

Accepted Answer

A genetic disorder affecting the enzyme that forms glycosidic linkages can lead to abnormal polysaccharide storage diseases.

Macromolecules: Structure and Function in Biology

Study Guide - Practice Questions