Q: A dehydration reaction is crucial in the synthesis of macromolecules. Which equation best represents a dehydration reaction between two monomers?

$\text{Monomer}_1 + \text{Monomer}_2 \rightarrow \text{Polymer} + \text{H}_2\text{O}$

Question 1

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

Accepted Answer

Lipids are formed from smaller molecules but do not consist of repeating subunits like polymers.

Question 2

A dehydration reaction is crucial in the synthesis of macromolecules. Which equation best represents a dehydration reaction between two monomers?

Accepted Answer

$	ext{Monomer}_1 + 	ext{Monomer}_2 ightarrow 	ext{Polymer} + 	ext{H}_2	ext{O}$

Question 3

Which structural difference between starch and cellulose is responsible for their distinct functions in plants?

Accepted Answer

Starch is a polymer of alpha-glucose, while cellulose is a polymer of beta-glucose.

Question 4

Which of the following best describes the role of glycogen in animals?

Accepted Answer

Glycogen is a storage polysaccharide found mainly in liver and muscle cells.

Question 5

A patient is diagnosed with a deficiency in omega-3 fatty acids. Which of the following is a likely consequence?

Accepted Answer

Reduced protection against cardiovascular disease.

Question 6

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

Accepted Answer

Trans fats pack more tightly, raising LDL cholesterol and increasing cardiovascular risk.

Question 7

Which of the following is a correct description of the structure of a phospholipid?

Accepted Answer

A phospholipid consists of two fatty acids and a phosphate group attached to glycerol.

Question 8

Which of the following best explains the amphipathic nature of phospholipids and its importance in cell membranes?

Accepted Answer

Phospholipids have both hydrophilic and hydrophobic regions, enabling the formation of bilayers in membranes.

Question 9

A mutation causes a single amino acid substitution in the beta chain of hemoglobin, resulting in sickle-cell disease. Which level of protein structure is directly affected by this mutation?

Accepted Answer

Primary structure

Question 10

Which of the following bonds is primarily responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 11

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

Accepted Answer

Storing genetic information

Question 12

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

Accepted Answer

The arrangement and interaction of multiple polypeptide chains.

Question 13

Which of the following correctly matches a macromolecule with its monomer?

Accepted Answer

Carbohydrate: monosaccharide

Question 14

Which of the following equations correctly represents the formation of a phosphodiester bond in nucleic acids?

Accepted Answer

$	ext{Nucleotide}_1 + 	ext{Nucleotide}_2 ightarrow 	ext{Dinucleotide} + 	ext{H}_2	ext{O}$

Question 15

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

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 16

Which of the following base pairs is found in DNA but not in RNA?

Accepted Answer

Adenine–Thymine

Question 17

Which of the following best explains why humans cannot digest cellulose?

Accepted Answer

Humans lack enzymes that hydrolyze beta-1,4 glycosidic linkages in cellulose.

Question 18

A scientist is studying the effect of a mutation that disrupts hydrogen bonding in the backbone of a protein. Which level of protein structure is most likely to be affected?

Accepted Answer

Secondary structure

Question 19

Which of the following is a real-world consequence of the difference in structure between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids pack tightly, making animal fats solid at room temperature.

The Structure and Function of Large Biological Molecules (Macromolecules)

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