Question 1

Which of the following statements best explains why water is considered the 'universal solvent' in biological systems?

Accepted Answer

Water molecules form hydration spheres around ions and polar molecules due to their polarity.

Question 2

A patient is diagnosed with acidosis. Which of the following best describes the patient's blood pH?

Accepted Answer

pH below 7.35

Question 3

Which of the following is a correct chemical notation for a molecule containing two sodium ions?

Accepted Answer

$$2Na^+$$

Question 4

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 5

A protein is exposed to high heat and loses its functional shape. Which process has occurred?

Accepted Answer

Denaturation

Question 6

Which of the following molecules is most likely to dissolve in water?

Accepted Answer

A hydrophilic molecule with polar covalent bonds

Question 7

Which of the following is a correct example of a decomposition reaction?

Accepted Answer

$$ABC \rightarrow A + B + C$$

Question 8

Which property of water is responsible for the cooling effect of perspiration on the skin?

Accepted Answer

High heat capacity

Question 9

Which of the following best describes the structure of a triglyceride?

Accepted Answer

Three fatty acids attached to a glycerol molecule

Question 10

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA is a double-stranded helix, while RNA is a single-stranded chain.

Question 11

Which of the following best explains why saturated fatty acids are solid at room temperature?

Accepted Answer

They have only single carbon-carbon bonds, allowing tight packing.

Question 12

A solution contains dispersed proteins that remain indefinitely without settling. What type of mixture is this?

Accepted Answer

Colloid

Question 13

Which of the following is a function of buffers in the human body?

Accepted Answer

They combine with hydrogen ions when concentrations are too high or release them when concentrations are too low.

Question 14

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

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and accelerating reactions.

Question 15

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in H$$_2O$$

Question 16

Which of the following is true about the atomic number of an element?

Accepted Answer

It is the number of protons in the atom.

Question 17

Which of the following best describes the difference between hydrophilic and hydrophobic molecules?

Accepted Answer

Hydrophilic molecules interact readily with water due to their polarity, while hydrophobic molecules do not.

Question 18

Which of the following is a correct example of a synthesis reaction?

Accepted Answer

$$A + B + C \rightarrow ABC$$

Question 19

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 20

Which of the following best describes the function of glycogen in the human body?

Accepted Answer

It is a highly-branched chain used by animals to store energy in muscles and liver.

Chapter 2: The Chemical Level of Organization – Study Notes

Study Guide - Practice Questions