Question 1

Which of the following elements is NOT considered one of the four most abundant elements in living systems?

Accepted Answer

Phosphorus (P)

Question 2

Which type of bond links the monomers in a polysaccharide?

Accepted Answer

Glycosidic (ether) bond

Question 3

A patient is diagnosed with a genetic disorder that affects the formation of peptide bonds. Which class of macromolecule will be most directly affected?

Accepted Answer

Proteins

Question 4

Which of the following best describes an amphipathic molecule?

Accepted Answer

A molecule with both hydrophobic and hydrophilic regions

Question 5

Which of the following is the correct formula for calculating pH?

Accepted Answer

$\mathrm{pH} = -\log [\mathrm{H}^+]$

Question 6

Which of the following statements about water is FALSE?

Accepted Answer

Water has a higher density in its solid state than in its liquid state

Question 7

Which of the following is a correct pairing of a biological macromolecule with its monomer and linkage?

Accepted Answer

Polysaccharide – Monosaccharide – Glycosidic bond

Question 8

A solution has a hydrogen ion concentration of $1 	imes 10^{-8}$ M. What is its pH?

Accepted Answer

$8$

Question 9

Which of the following best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

Their amphipathic nature causes hydrophobic tails to avoid water and hydrophilic heads to interact with water

Question 10

Which of the following is a property of water that is critical for its role as the medium of life?

Accepted Answer

Ability to form four hydrogen bonds

Question 11

Which of the following best describes the relationship between pH and hydrogen ion concentration?

Accepted Answer

As pH increases, $[\mathrm{H}^+]$ decreases

Question 12

A molecule that donates a proton in an aqueous solution is classified as:

Accepted Answer

An acid

Question 13

Which of the following is a correct statement about the physiological pH range?

Accepted Answer

Most biological reactions occur between pH 6.5 and 8.0

Question 14

Which of the following is NOT a major class of biological macromolecule?

Accepted Answer

Vitamins

Question 15

Which of the following best explains why the charge of a biomolecule can change with pH?

Accepted Answer

pH changes the protonation state of ionizable groups

Question 16

Which of the following is a correct example of a monomer and its corresponding macromolecule?

Accepted Answer

Nucleotide – Nucleic acid

Question 17

A scientist is studying a molecule that contains both a long hydrocarbon chain and a charged phosphate group. This molecule is most likely to:

Accepted Answer

Form a phospholipid bilayer in water

Question 18

Which of the following best describes the role of sulfur (S) and phosphorus (P) in living systems?

Accepted Answer

They are essential elements but less abundant than C, H, O, and N

Question 19

Which of the following is a correct statement about lipids?

Accepted Answer

Lipids are major structural elements of membranes

Question 20

A solution has a pH of 5. What is the hydrogen ion concentration $[\mathrm{H}^+]$?

Accepted Answer

$1 	imes 10^{-5}$ M

Fundamental Concepts in Biochemistry: Elements, Macromolecules, and Their Structure

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