Question 1

Which of the following best describes the primary function of nucleic acids in living organisms?

Accepted Answer

They store and transmit genetic information.

Question 2

A patient is diagnosed with a genetic disorder caused by a mutation in the DNA sequence. Which type of biological molecule is directly affected by this mutation?

Accepted Answer

Nucleic acids

Question 3

Which of the following is the correct general formula for a monosaccharide?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 4

A scientist is studying a molecule that is insoluble in water, contains long hydrocarbon chains, and is a major component of cell membranes. Which class of biological molecules does this describe?

Accepted Answer

Lipids

Question 5

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

Accepted Answer

They speed up chemical reactions without being permanently changed.

Question 6

A student mixes glucose and fructose in a test tube and observes the formation of sucrose and water. Which type of reaction has occurred?

Accepted Answer

Dehydration synthesis

Question 7

Which of the following statements about the structure of proteins is correct?

Accepted Answer

Proteins are made up of amino acids linked by peptide bonds.

Question 8

A mutation causes a change in the primary structure of a protein. Which level of protein structure is directly affected?

Accepted Answer

Primary structure

Question 9

Which of the following best describes the role of carbohydrates in living organisms?

Accepted Answer

They are the main source of immediate energy.

Question 10

A biologist is analyzing a sample and finds a molecule with a phosphate group, a pentose sugar, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 11

Which of the following equations correctly represents the hydrolysis of a disaccharide?

Accepted Answer

$$C_{12}H$$_{22}$$O_{11} + H_2O \rightarrow 2C_6H_{12}O_6$

Question 12

Which of the following is a function of lipids in biological systems?

Accepted Answer

Forming the structural component of cell membranes

Question 13

A person is unable to digest lactose due to a deficiency in the enzyme lactase. Which type of biological molecule is lactase?

Accepted Answer

Protein

Question 14

Which of the following best explains why water is essential for hydrolysis reactions in the body?

Accepted Answer

Water is a reactant that breaks bonds between monomers.

Question 15

A researcher observes that a certain molecule contains both hydrophilic and hydrophobic regions. This property is most characteristic of which type of molecule found in cell membranes?

Accepted Answer

Phospholipids

Question 16

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

Accepted Answer

DNA stores genetic information, while RNA helps in protein synthesis.

Question 17

A patient is found to have a buildup of fatty deposits in their arteries. Which type of biological molecule is most likely responsible for this condition?

Accepted Answer

Lipids

Question 18

Which of the following is a correct statement about the structure of carbohydrates?

Accepted Answer

Carbohydrates are made up of monosaccharide monomers.

Question 19

A person eats a meal rich in starch. Which process will their body use to break down the starch into glucose molecules?

Accepted Answer

Hydrolysis

Question 20

Which of the following best explains why proteins can perform such a wide variety of functions in living organisms?

Accepted Answer

Proteins have a unique three-dimensional structure determined by the sequence of amino acids.

Fundamental Biomolecules in General Biology

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