Question 1

Which property of carbon most directly explains its ability to form a vast diversity of organic molecules essential for life?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms.

Question 2

Which of the following best describes a dehydration reaction in the synthesis of biological macromolecules?

Accepted Answer

A reaction that joins two monomers together by removing a molecule of water.

Question 3

A patient is found to have a genetic disorder that prevents the formation of phospholipids. Which cellular structure would be most directly affected?

Accepted Answer

The plasma membrane

Question 4

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-\mathrm{COOH})$$

Question 5

Which of the following statements about saturated and unsaturated fats is correct?

Accepted Answer

Unsaturated fats have one or more double bonds, causing kinks in their structure and making them liquid at room temperature.

Question 6

Which of the following best explains why trans fats are considered more harmful than saturated fats?

Accepted Answer

Trans fats are artificially produced during hydrogenation and have been linked to increased risk of heart disease.

Question 7

Which of the following is a correct pairing of a carbohydrate and its function?

Accepted Answer

Glycogen – energy storage in animals

Question 8

A scientist isolates a molecule with the formula $$C_{6}H$$_{12}$$O_{6}$. This molecule is most likely a:

Accepted Answer

Monosaccharide

Question 9

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms, forming alpha helices and beta sheets?

Accepted Answer

Secondary structure

Question 10

Which of the following best describes the process of denaturation in proteins?

Accepted Answer

Unfolding the protein, disrupting its secondary and tertiary structure without breaking peptide bonds.

Question 11

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

Accepted Answer

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

Question 12

Which of the following base pairs is found in DNA?

Accepted Answer

Guanine–Cytosine

Question 13

Which of the following best describes the process of gene expression?

Accepted Answer

The process by which information from a gene is used to synthesize a functional product, such as a protein.

Question 14

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

Accepted Answer

Storing genetic information

Question 15

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes are primarily proteins that act as biological catalysts.

Question 16

A nucleotide consists of which three components?

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 17

Which of the following best explains how a cell can build a wide variety of macromolecules from a small set of monomers?

Accepted Answer

By arranging a small number of monomers in different sequences and combinations.

Question 18

Which of the following is a correct description of a hydrolysis reaction?

Accepted Answer

A reaction that breaks a polymer into monomers by adding water.

Question 19

Which of the following is a function of steroids in the human body?

Accepted Answer

Acting as hormones to regulate physiological processes

Question 20

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

Accepted Answer

DNA nucleotides contain deoxyribose sugar, while RNA nucleotides contain ribose sugar.

Chapter 3: Biomolecules and Their Functions – Guided Study

Study Guide - Practice Questions