$$[H^+] = 1 \times 10$$^{-4}$$ \text{ M}$$

Question 1

Which property of water allows insects like water striders to walk on its surface without sinking?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

A scientist is studying the dissociation of water. Which equation correctly represents the dissociation of water molecules?

Accepted Answer

$$H_2O \rightarrow H^+ + OH^-$$

Question 3

Which functional group is found in both amino acids and proteins, and is essential for peptide bond formation?

Accepted Answer

Amino group ($$-NH_2$)

Question 4

Which of the following best explains why ice floats on water?

Accepted Answer

Ice has a lower density than liquid water because hydrogen bonds keep water molecules further apart.

Question 5

Which type of bond is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 6

A solution has a pH of 4. What is the concentration of hydrogen ions ($$[H^+]) in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ 	ext{ M}$$

Question 7

Which process is responsible for breaking down polymers into monomers in biological systems?

Accepted Answer

Hydrolysis

Question 8

Which property of water is most important for regulating temperature in living organisms?

Accepted Answer

High specific heat

Question 9

Which of the following is a correct description of a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms

Question 10

Which macromolecule is primarily responsible for storing genetic information in cells?

Accepted Answer

DNA

Question 11

A patient is suffering from acidosis. Which buffer system in the blood helps maintain pH homeostasis?

Accepted Answer

Bicarbonate buffer system

Question 12

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

Accepted Answer

The overall three-dimensional shape of a polypeptide due to interactions among R groups

Question 13

Which functional group is characteristic of carbohydrates and is involved in forming glycosidic linkages?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 14

Which property of water is most important for the transport of water from roots to leaves in plants?

Accepted Answer

Cohesion and adhesion

Question 15

Which of the following is NOT a function of lipids in biological systems?

Accepted Answer

Catalyzing chemical reactions

Question 16

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water's polarity allows it to surround and separate ions.

Question 17

Which of the following correctly describes dehydration synthesis?

Accepted Answer

A process that joins monomers to form polymers by removing water

Question 18

Which of the following is a direct result of water's high specific heat in living organisms?

Accepted Answer

Stable internal temperatures despite external fluctuations

Question 19

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

Accepted Answer

DNA is a double helix composed of nucleotides joined by phosphodiester bonds.

Question 20

A biologist is analyzing a protein and finds a disulfide bridge. Which amino acid is most likely involved in this bond?

Accepted Answer

Cysteine

The Chemistry of Life: Foundations for General Biology

Study Guide - Practice Questions