Question 1

Which of the following best describes the process by which monomers are joined to form polymers in biological systems?

Accepted Answer

Dehydration reaction, which removes a water molecule to form a covalent bond between monomers.

Question 2

A patient is diagnosed with atherosclerosis. Which type of molecule is most directly implicated in the development of this condition?

Accepted Answer

Saturated fats

Question 3

Which of the following is a correct match between a macromolecule and its building block?

Accepted Answer

Carbohydrate — Monosaccharide

Question 4

Which of the following statements about cellulose is correct?

Accepted Answer

It is a structural polysaccharide found in plant cell walls.

Question 5

Which of the following best describes the general structure of an amino acid?

Accepted Answer

A central carbon atom bonded to a hydrogen atom, a carboxyl group, an amino group, and a variable R group.

Question 6

Which of the following is NOT a correct pairing of a nitrogenous base with the nucleic acid in which it is found?

Accepted Answer

Uracil — DNA

Question 7

A triglyceride is formed by the combination of which of the following?

Accepted Answer

Three fatty acids and one glycerol molecule

Question 8

Which of the following best explains why trans fats are considered unhealthy?

Accepted Answer

They are produced by hydrogenation, which creates double bonds in the trans configuration, raising LDL cholesterol.

Question 9

Which of the following correctly lists the three components of a nucleotide?

Accepted Answer

Phosphate group, pentose sugar, nitrogenous base

Question 10

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 11

Which of the following is a key difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 12

Which of the following best describes the function of a gene?

Accepted Answer

A gene is a segment of DNA that codes for a specific protein or RNA molecule.

Question 13

Which of the following best explains why starch and cellulose, both polymers of glucose, have different properties?

Accepted Answer

They have different types of glycosidic linkages between glucose monomers.

Question 14

A dehydration reaction can be represented by which of the following equations?

Accepted Answer

$$Monomer_1$$ + $$Monomer_2$$ \rightarrow Polymer + H_2O$$

Question 15

Which of the following best describes the secondary structure of a protein?

Accepted Answer

The local folding of the polypeptide chain into alpha helices and beta sheets stabilized by hydrogen bonds.

Question 16

Which of the following is a correct statement about isomers?

Accepted Answer

Isomers are molecules with the same molecular formula but different structures.

Question 17

Which of the following best explains the effect of denaturation on a protein?

Accepted Answer

Denaturation disrupts the secondary, tertiary, and quaternary structures, causing loss of function.

Question 18

Which of the following is a characteristic feature of steroids?

Accepted Answer

Four fused carbon rings

Question 19

Which of the following best describes hydrolysis?

Accepted Answer

A reaction that breaks polymers into monomers by adding a water molecule.

Question 20

Which of the following is a correct statement about glycogen?

Accepted Answer

Glycogen is a storage polysaccharide found in animals.

The Molecules of Life: Study Guide and Key Concepts

Study Guide - Practice Questions