Question 1

Which property of carbon allows it to form large and diverse organic molecules?

Accepted Answer

It can form up to four covalent bonds with other atoms.

Question 2

Which of the following best describes an isomer?

Accepted Answer

Molecules with the same molecular formula but different structures.

Question 3

A dehydration reaction is crucial in the formation of which biological structure?

Accepted Answer

Linking monomers together to form polymers.

Question 4

Which functional group is characteristic of amino acids and is involved in peptide bond formation?

Accepted Answer

Amino group

Question 5

Which of the following is a storage polysaccharide found in animals?

Accepted Answer

Glycogen

Question 6

What is the main structural difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids contain one or more double bonds; saturated do not.

Question 7

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads interact with water, and hydrophobic tails avoid water.

Question 8

Which of the following is NOT a function of proteins?

Accepted Answer

Genetic information storage

Question 9

What happens to a protein during denaturation?

Accepted Answer

It loses its specific shape and function.

Question 10

Which level of protein structure is determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 11

Which of the following statements about DNA and RNA is correct?

Accepted Answer

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

Question 12

A nucleotide is composed of which three components?

Accepted Answer

A phosphate group, a sugar, and a nitrogenous base

Question 13

Which reaction is responsible for breaking down polymers into monomers in the digestive system?

Accepted Answer

Hydrolysis reaction

Question 14

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

They speed up chemical reactions without being consumed.

Question 15

Which of the following is a real-life example of a structural polysaccharide?

Accepted Answer

Cellulose in plant cell walls

Question 16

Which of the following best explains why cholesterol is important in animal cells?

Accepted Answer

It is a component of cell membranes and a precursor for steroid hormones.

Question 17

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

Accepted Answer

$$\mathrm{C}_n\mathrm{H}_{2n}\mathrm{O}_n$$

Question 18

Which of the following best describes the difference between testosterone and estradiol?

Accepted Answer

They have the same carbon skeleton but different functional groups.

Question 19

Which of the following best explains the process of transcription and translation in cells?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein.

Question 20

Which of the following best describes the role of R groups in amino acids?

Accepted Answer

They determine the specific properties and functions of each amino acid.

The Molecules of Cells: Structure and Function of Biological Macromolecules

Study Guide - Practice Questions