Question 1

Which of the following best describes an isotope?

Accepted Answer

An atom with the same number of protons but a different number of neutrons.

Question 2

A patient is diagnosed with metabolic acidosis. Which of the following best explains the chemical basis for this condition?

Accepted Answer

The blood has an excess of hydrogen ions, lowering the pH below 7.35.

Question 3

Which of the following equations correctly represents the dissociation of water into its ionic components?

Accepted Answer

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

Question 4

Which of the following best explains why carbon is essential for life on Earth?

Accepted Answer

Carbon atoms can form four covalent bonds, allowing for complex and diverse molecules.

Question 5

A sodium atom (Na) has an atomic number of 11 and a mass number of 23. How many neutrons does it have?

Accepted Answer

12

Question 6

Which of the following best describes the difference between a molecule and a compound?

Accepted Answer

A molecule is a group of atoms bonded together, while a compound is a molecule that contains at least two different elements.

Question 7

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

Accepted Answer

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

Question 8

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

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 9

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

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons.

Question 10

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

Accepted Answer

ATP acts as the primary energy currency, providing energy for cellular processes.

Question 11

A solution has a pH of 4. How does its hydrogen ion concentration compare to a solution with a pH of 7?

Accepted Answer

It is 1000 times higher.

Question 12

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

Accepted Answer

Buffers maintain pH stability by neutralizing excess acids or bases.

Question 13

Which of the following is NOT a function of proteins in the human body?

Accepted Answer

Storing genetic information.

Question 14

Which of the following best describes the difference between anabolism and catabolism?

Accepted Answer

Anabolism builds complex molecules from simpler ones, while catabolism breaks down complex molecules into simpler ones.

Question 15

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

Accepted Answer

Water is polar and can dissolve many ionic and polar substances.

Question 16

Which of the following is a correct statement about the three biological macromolecules and their primary functions?

Accepted Answer

Proteins catalyze reactions, carbohydrates provide energy, and lipids store energy and form membranes.

Question 17

Which of the following best describes the general arrangement of the periodic table of elements?

Accepted Answer

Elements are arranged by increasing atomic number and grouped by similar chemical properties.

Question 18

Which of the following best explains the difference between a polar and a nonpolar covalent bond?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

Question 19

Which of the following best describes the role of subatomic particles in the formation of an atom?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit the nucleus.

Chapter 2 Study Guide: Chemical Level in Anatomy & Physiology

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