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 property makes $^{14}\mathrm{C}$ different from the most common carbon isotope, $^{12}\mathrm{C}$?

Accepted Answer

$^{14}\mathrm{C}$ has more neutrons than $^{12}\mathrm{C}$.

Question 3

Which of the following statements about covalent bonds is correct?

Accepted Answer

Covalent bonds are formed when two atoms share one or more pairs of 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

$pH = 5$

Question 5

Which of the following best describes the difference between a saturated and an unsaturated fatty acid?

Accepted Answer

Saturated fatty acids have only single bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 6

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

Accepted Answer

Amino group ($-NH_2$)

Question 7

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

Accepted Answer

Hydrogen bonds in ice are more stable and keep water molecules further apart, making ice less dense.

Question 8

Which of the following is NOT a property of enzymes?

Accepted Answer

Enzymes are consumed during the reaction they catalyze.

Question 9

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus, while eukaryotic cells have a nucleus.

Question 10

A patient is diagnosed with a genetic disorder that affects the structure of their lysosomes. Which cellular process is most likely to be impaired?

Accepted Answer

Digestion of macromolecules within the cell

Question 11

Which of the following statements about DNA is correct?

Accepted Answer

DNA contains the nitrogenous bases adenine, thymine, cytosine, and guanine.

Question 12

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers minimize changes in pH by accepting or donating $H^+$ ions.

Question 13

Which of the following is a correct description of a dehydration reaction?

Accepted Answer

A reaction that joins two monomers by removing a molecule of water.

Question 14

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

Accepted Answer

They have both hydrophilic and hydrophobic regions.

Question 15

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

Accepted Answer

Starch is used for energy storage in plants, while cellulose is used for structural support.

Question 16

Which of the following best explains why carbon can form such a diversity of organic molecules?

Accepted Answer

Carbon can form four covalent bonds with a variety of atoms.

Question 17

A scientist observes a cell with a cell wall, chloroplasts, and a large central vacuole. Which type of cell is this most likely to be?

Accepted Answer

Plant cell

Question 18

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally between two atoms due to differences in electronegativity.

Question 19

Which of the following is a correct sequence of the endomembrane system in a eukaryotic cell for a protein destined for secretion?

Accepted Answer

Rough ER → Golgi apparatus → plasma membrane

Question 20

Which of the following best describes the function of the cytoskeleton in eukaryotic cells?

Accepted Answer

It provides structural support, aids in cell movement, and organizes cell components.

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

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