Question 1

Which of the following statements best explains why molecular structure and function are inseparable in biological macromolecules?

Accepted Answer

The three-dimensional structure of a macromolecule determines how it interacts with other molecules, thus dictating its function.

Question 2

Which of the following is NOT a polymer formed from monomers?

Accepted Answer

Lipids

Question 3

During the synthesis of a polymer, which type of reaction occurs and what is the byproduct?

Accepted Answer

Dehydration reaction; water is produced

Question 4

A scientist is studying the breakdown of starch into glucose monomers. Which process is she investigating, and what molecule is required for this reaction?

Accepted Answer

Hydrolysis; water ($$H_2O)$$

Question 5

Which of the following best describes the diversity of polymers in living cells?

Accepted Answer

Macromolecules vary among cells, species, and even more between different species.

Question 6

Glucose ($$C_6H_{12}O_6$) is classified as which type of carbohydrate, and what is its primary function in cells?

Accepted Answer

Monosaccharide; fuel for cellular processes

Question 7

Which structural difference distinguishes cellulose from starch, and what is the biological consequence of this difference?

Accepted Answer

Cellulose has beta ($$\beta) $$glycosidic linkages, making it indigestible by most animals.

Question 8

Which of the following is a storage polysaccharide found in animals, and where is it primarily stored?

Accepted Answer

Glycogen; liver and muscle cells

Question 9

A patient is diagnosed with sickle-cell disease. Which change at the molecular level is responsible for this condition?

Accepted Answer

A single amino acid substitution in the primary structure of hemoglobin.

Question 10

Which of the following best describes the structure of a phospholipid and its role in biological membranes?

Accepted Answer

A phospholipid has two fatty acid tails and a hydrophilic head, forming a bilayer in cell membranes.

Question 11

Which of the following is TRUE about the difference between saturated and unsaturated fatty acids?

Accepted Answer

Unsaturated fatty acids contain one or more double bonds, causing kinks in the chain and making them liquid at room temperature.

Question 12

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

Accepted Answer

Energy storage in adipose tissue

Question 13

A protein loses its three-dimensional structure after exposure to high temperature. What is this process called, and what is the consequence for the protein's function?

Accepted Answer

Denaturation; the protein becomes biologically inactive

Question 14

Which level of protein structure is primarily determined by inherited genetic information and consists of a unique sequence of amino acids?

Accepted Answer

Primary structure

Question 15

Which of the following correctly matches a protein type with its function?

Accepted Answer

Hormonal protein; coordinates organism activities

Question 16

Which of the following is a component of a nucleotide in nucleic acids?

Accepted Answer

Nitrogenous base

Question 17

Which statement best explains why DNA and RNA differ in their sugar components?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 18

Which of the following techniques is commonly used to determine the three-dimensional structure of a protein?

Accepted Answer

X-ray crystallography

Question 19

A researcher is comparing the DNA sequences of two species to assess their evolutionary relationship. Which field of study does this research belong to?

Accepted Answer

Genomics

Question 20

Which of the following best describes the role of chaperonins in the cell?

Accepted Answer

They assist in the proper folding of other proteins.

The Structure and Function of Large Biological Molecules

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