Question 1

Which property of water allows sweating to effectively cool the human body during exercise?

Accepted Answer

Water's high heat of vaporization

Question 2

A scientist observes that water droplets bead up on a waxy leaf surface. Which property of water best explains this phenomenon?

Accepted Answer

Cohesion due to hydrogen bonding

Question 3

Which element is NOT directly required for the synthesis of nucleic acids in living organisms?

Accepted Answer

Sulfur

Question 4

Which process is responsible for breaking down a polysaccharide into monosaccharides in the human digestive system?

Accepted Answer

Hydrolysis

Question 5

A mutation causes a protein to have a single amino acid substitution from a hydrophobic R group to a hydrophilic R group. Which level(s) of protein structure could be directly affected?

Accepted Answer

All levels: primary, secondary, tertiary, and quaternary structures

Question 6

Which of the following best explains why unsaturated fats are typically liquid at room temperature?

Accepted Answer

They have more double bonds, causing kinks in the fatty acid chains

Question 7

Which of the following is a function of cholesterol in animal cells?

Accepted Answer

Structural stability of cell membranes

Question 8

A dehydration synthesis reaction between two glucose molecules results in the formation of which of the following?

Accepted Answer

A disaccharide and a molecule of water

Question 9

Which of the following best describes the role of phospholipids in cells?

Accepted Answer

They form the lipid bilayer of plasma membranes

Question 10

A patient is unable to maintain a stable body temperature. Which property of water is most likely impaired in this individual?

Accepted Answer

High specific heat capacity

Question 11

Which of the following statements about protein structure is correct?

Accepted Answer

Tertiary structure results from interactions such as hydrogen bonds, ionic interactions, and disulfide bridges

Question 12

Which macromolecule is correctly matched with its monomer?

Accepted Answer

Carbohydrate – monosaccharide

Question 13

A researcher adds a solution to a protein, causing the disruption of hydrogen bonds but not peptide bonds. Which level(s) of protein structure will be most directly affected?

Accepted Answer

Secondary and tertiary structures

Question 14

Which of the following best explains why water is an excellent solvent for ionic and polar substances?

Accepted Answer

Water molecules form hydrogen bonds with ions and polar molecules due to their polarity

Question 15

Which of the following is a direct result of the polarity of water molecules?

Accepted Answer

Formation of hydrogen bonds between water molecules

Question 16

Which of the following correctly describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have only single bonds; unsaturated fatty acids have at least one double bond

Question 17

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

Accepted Answer

Hormonal regulation of growth and development

Question 18

Which chemical reaction is responsible for the formation of a peptide bond between two amino acids?

Accepted Answer

Dehydration synthesis

Question 19

A cell is unable to produce phospholipids. Which cellular structure would be most directly affected?

Accepted Answer

Plasma membrane

Question 20

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

Accepted Answer

They have different arrangements of glucose monomers

Chemistry of Life: Structure and Function of Biological Macromolecules

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