Question 1

Which of the following best explains why water has a high specific heat compared to most other substances?

Accepted Answer

Hydrogen bonds between water molecules absorb heat when they break and release heat when they form.

Question 2

A radioactive isotope of carbon, $^{14}\mathrm{C}$, is used in medical imaging. Which statement about $^{14}\mathrm{C}$ is correct?

Accepted Answer

$^{14}\mathrm{C}$ has 6 protons and 8 neutrons.

Question 3

Which of the following best describes the difference between a cation and an anion?

Accepted Answer

A cation is an ion that has lost electrons, while an anion has gained electrons.

Question 4

A solution has a hydrogen ion concentration of $[H^+] = 1 	imes 10^{-5}\ \mathrm{M}$. What is the pH of this solution?

Accepted Answer

$5$

Question 5

Which property of water allows a plant to transport water from its roots to its leaves against gravity?

Accepted Answer

Cohesion and adhesion due to hydrogen bonding

Question 6

Which of the following statements about isomers is correct?

Accepted Answer

Structural isomers have the same molecular formula but different covalent arrangements of their atoms.

Question 7

Which functional group is present in all amino acids and acts as a base by accepting $H^+$ ions?

Accepted Answer

Amino group ($-\mathrm{NH}_2$)

Question 8

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Starch is a polymer of glucose with $\alpha$-glycosidic linkages, while cellulose is a polymer of glucose with $\beta$-glycosidic linkages.

Question 9

A triglyceride is formed by joining which of the following components?

Accepted Answer

One glycerol and three fatty acids

Question 10

Which level of protein structure is primarily determined by hydrogen bonds between the backbone atoms of the polypeptide chain?

Accepted Answer

Secondary structure

Question 11

Which of the following statements about DNA is correct?

Accepted Answer

DNA is usually double-stranded and forms a double helix.

Question 12

Which of the following best describes the function of the Golgi apparatus in a eukaryotic cell?

Accepted Answer

It modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Question 13

Which of the following is a difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells lack a nucleus.

Question 14

A buffer solution is prepared by mixing acetic acid and sodium acetate. When a small amount of hydrochloric acid ($\mathrm{HCl}$) is added, what happens to the pH of the solution?

Accepted Answer

The pH decreases only slightly.

Question 15

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 in their fatty acid chains, allowing them to pack closely together.

Question 16

Which of the following organelles is responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 17

Which of the following is a property of phospholipids that makes them essential for cell membrane structure?

Accepted Answer

They have both hydrophilic and hydrophobic regions.

Question 18

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes act as catalysts, speeding up reactions by lowering the activation energy.

Question 19

Which of the following statements about the endomembrane system is correct?

Accepted Answer

It is involved in the synthesis, modification, and transport of proteins and lipids.

Question 20

A scientist observes a cell with a cell wall, chloroplasts, and a large central vacuole. Which type of cell is being observed?

Accepted Answer

Plant cell

Key Concepts in the Chemical Context of Life, Water and Life, Carbon Chemistry, Biological Macromolecules, and Cell Structure

Study Guide - Practice Questions

Study Guide - Flashcards