Question 1

Which of the following statements best describes the difference between a dehydration reaction and hydrolysis in the context of biological macromolecules?

Accepted Answer

Dehydration reactions join monomers to form polymers by removing a water molecule, while hydrolysis breaks polymers into monomers by adding a water molecule.

Question 2

A patient is diagnosed with a genetic disorder that affects the enzyme responsible for breaking down glycogen in liver cells. What is the most likely consequence of this disorder?

Accepted Answer

The patient will have impaired ability to release glucose from glycogen stores during periods of high energy demand.

Question 3

Which of the following best explains why cellulose cannot be digested by most animals, including humans?

Accepted Answer

Cellulose contains beta ($\beta$) glycosidic linkages, and most animals lack enzymes to hydrolyze these bonds.

Question 4

A biologist discovers a new organism whose exoskeleton contains a polysaccharide with nitrogen-containing side groups. Which polysaccharide is most likely present?

Accepted Answer

Chitin

Question 5

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

Accepted Answer

Saturated fatty acids have no double bonds and are typically solid at room temperature.

Question 6

Trans fats are produced during the hydrogenation of vegetable oils. What is a major health concern associated with trans fats?

Accepted Answer

Trans fats increase the risk of cardiovascular disease more than saturated fats.

Question 7

Phospholipids are critical components of cell membranes. What property of phospholipids allows them to form bilayers in aqueous environments?

Accepted Answer

Phospholipids have both hydrophilic heads and hydrophobic tails, causing them to arrange into bilayers with tails facing inward.

Question 8

A mutation causes a single amino acid substitution in the primary structure of hemoglobin. What is the most likely effect of this mutation?

Accepted Answer

It may alter the protein's three-dimensional structure and impair its ability to carry oxygen, as seen in sickle-cell disease.

Question 9

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms, rather than side chains?

Accepted Answer

Secondary structure

Question 10

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

Accepted Answer

Storing genetic information

Question 11

A protein is exposed to extreme heat, causing it to lose its native structure. What is this process called, and what is the consequence?

Accepted Answer

Denaturation; the protein becomes biologically inactive.

Question 12

Which of the following correctly matches the monomer with its corresponding polymer?

Accepted Answer

Nucleotide — DNA

Question 13

Which statement best describes the structure of DNA?

Accepted Answer

DNA consists of two antiparallel polynucleotide strands forming a double helix.

Question 14

Which of the following base pairs is found in DNA due to complementary base pairing?

Accepted Answer

Adenine — Thymine

Question 15

A scientist is comparing the genomes of two different species to study evolutionary relationships. Which field of biology does this research best represent?

Accepted Answer

Genomics

Question 16

Which of the following is a correct description of a phosphodiester linkage in nucleic acids?

Accepted Answer

A bond between the phosphate group of one nucleotide and the sugar of another nucleotide.

Question 17

Which of the following is a real-world consequence of protein misfolding in human health?

Accepted Answer

Protein misfolding is associated with diseases such as Alzheimer's and Parkinson's.

Question 18

Which of the following correctly describes the difference between purines and pyrimidines?

Accepted Answer

Purines have a six-membered ring fused to a five-membered ring, while pyrimidines have a single six-membered ring.

Question 19

Which of the following best explains why starch and cellulose, both polymers of glucose, have different properties?

Accepted Answer

Starch and cellulose have different types of glycosidic linkages, resulting in different three-dimensional structures.

The Structure and Function of Large Biological Molecules

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