$$ \text{Monomer}_1 + \text{Monomer}_2 \rightarrow \text{Polymer} + H_2O $$

$$ \text{Disaccharide} + H_2O \rightarrow \text{Monosaccharide}_1 + \text{Monosaccharide}_2 $$

Question 1

Which of the following statements best explains why carbon is the backbone of organic molecules in living organisms?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a variety of stable structures.

Question 2

A dehydration synthesis reaction is essential for building biological macromolecules. Which equation best represents this process?

Accepted Answer

$$ 	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + H_2O $$

Question 3

Which of the following best describes the difference between starch and cellulose, both polysaccharides made of glucose?

Accepted Answer

Starch is used for energy storage in plants, while cellulose provides structural support.

Question 4

A patient is unable to digest lactose due to a deficiency in the enzyme lactase. What type of biomolecule is lactase, and what is its function?

Accepted Answer

Lactase is a protein that acts as a catalyst to speed up the hydrolysis of lactose.

Question 5

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

Accepted Answer

The linear sequence of amino acids joined by peptide bonds.

Question 6

Which of the following is a correct representation of the hydrolysis of a disaccharide?

Accepted Answer

$$ 	ext{Disaccharide} + H_2O ightarrow 	ext{Monosaccharide}_1 + 	ext{Monosaccharide}_2 $$

Question 7

Which of the following best explains why enzymes are considered catalysts?

Accepted Answer

They increase the rate of chemical reactions without being consumed in the process.

Question 8

Which of the following is NOT a component of a nucleotide?

Accepted Answer

A fatty acid chain

Question 9

A mutation changes a single amino acid in the primary structure of hemoglobin. What is a possible consequence?

Accepted Answer

The protein may lose its normal function due to altered folding.

Question 10

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

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

Question 11

Which of the following best explains why lipids are not considered true polymers?

Accepted Answer

Lipids are not made from repeating monomer units.

Question 12

Which of the following is a function of phospholipids in the body?

Accepted Answer

They form the primary structure of cell membranes due to their hydrophobic and hydrophilic regions.

Question 13

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides chemical energy for cellular processes by releasing a phosphate group.

Question 14

Which of the following statements about cholesterol is correct?

Accepted Answer

Cholesterol is a steroid that is a precursor for sex hormones and a component of cell membranes.

Question 15

Which of the following best explains the difference between HDL and LDL cholesterol?

Accepted Answer

HDL holds cholesterol tightly and delivers it to the liver, while LDL cannot hold cholesterol as well and may deposit it in blood vessels.

Question 16

Which of the following best describes a glycosidic linkage?

Accepted Answer

A covalent bond formed between two monosaccharides during dehydration synthesis.

Question 17

Which of the following is a real-life example of protein denaturation?

Accepted Answer

Cooking an egg causes the egg white proteins to unfold and solidify.

Question 18

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

Accepted Answer

The overall 3D shape of a polypeptide stabilized by interactions between side chains.

Question 19

Which of the following is a correct equation for the conversion of ATP to ADP?

Accepted Answer

$$ 	ext{ATP} ightarrow 	ext{ADP} + P_i + 	ext{energy} $$

Chemistry of Life: Organic Compounds and Biological Macromolecules

Study Guide - Practice Questions