Question 1

Which property of carbon makes it uniquely suited as the framework for biological molecules?

Accepted Answer

It can form up to four covalent bonds with other atoms.

Question 2

A molecule with the formula $$C_6H_{12}O_6$ could be which of the following?

Accepted Answer

Glucose, a monosaccharide

Question 3

Which of the following best describes the difference between structural isomers and stereoisomers?

Accepted Answer

Structural isomers differ in the arrangement of their carbon skeleton, while stereoisomers differ in the spatial arrangement of groups attached to the skeleton.

Question 4

Which process is responsible for the breakdown of polymers into monomers in biological systems?

Accepted Answer

Hydrolysis

Question 5

During the formation of a peptide bond between two amino acids, which molecule is released?

Accepted Answer

Water ($$H_2O)$$

Question 6

Which of the following is a function of proteins in living organisms?

Accepted Answer

Enzyme catalysis

Question 7

A patient with cystic fibrosis has a mutation in a protein that appears to have the correct amino acid sequence but fails to fold properly. Which type of molecule is most likely malfunctioning in this scenario?

Accepted Answer

Chaperone protein

Question 8

Which of the following statements about phospholipids is correct?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, forming bilayers in water.

Question 9

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing their molecules to pack closely together.

Question 10

Which of the following is a correct pairing of nitrogenous bases in DNA?

Accepted Answer

Adenine with Thymine

Question 11

Which molecule is the primary energy currency of the cell?

Accepted Answer

ATP (adenosine triphosphate)

Question 12

Which of the following is a real-world example of a dehydration synthesis reaction?

Accepted Answer

Formation of starch from glucose monomers in plants

Question 13

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

Accepted Answer

The arrangement of multiple polypeptide chains (subunits) in a single protein

Question 14

Which of the following is a function of NAD+ and FAD in cellular metabolism?

Accepted Answer

Electron carriers for many cellular reactions

Question 15

Which of the following statements about chiral molecules is correct?

Accepted Answer

Chiral molecules have four unique groups attached to a central carbon and exist as mirror images.

Question 16

Which of the following is a correct description of a functional group?

Accepted Answer

A specific molecular group that bonds to a carbon-hydrogen core and imparts unique chemical properties.

Question 17

Which of the following is a correct statement about the structure of RNA compared to DNA?

Accepted Answer

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

Question 18

A scientist is studying the fermentation reaction in yeast. If yeast cells are broken open and the enzymes are isolated, what is the expected outcome when a fermentable substrate is provided?

Accepted Answer

CO$$_2$$ will be produced, indicating that the enzymes can function outside the cell.

Question 19

Which of the following best explains why proteins lose their function when denatured?

Accepted Answer

Denaturation disrupts the protein's three-dimensional structure, which is essential for its function.

Question 20

Which of the following is a correct statement about lipids?

Accepted Answer

Lipids are insoluble in water due to a high proportion of nonpolar C—H bonds.

The Chemical Building Blocks of Life: Structure and Function of Biological Macromolecules

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