Question 1

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

Accepted Answer

In a polar covalent bond, electrons are shared unequally, creating charged sides of the molecule.

Question 2

A sodium atom (Na) reacts with a chlorine atom (Cl) to form sodium chloride (NaCl). Which of the following statements best explains what happens during this reaction?

Accepted Answer

Sodium donates an electron to chlorine, forming oppositely charged ions that are attracted to each other.

Question 3

According to the octet rule, how many electrons are typically found in the valence shell of a stable atom (excluding hydrogen)?

Accepted Answer

$$8$$

Question 4

Which of the following best describes an anion?

Accepted Answer

An atom that has gained one or more electrons and is negatively charged.

Question 5

Which of the following is a property of water that allows it to transport substances throughout the body?

Accepted Answer

Water is a good solvent, allowing many substances to dissolve and be transported.

Question 6

A solution with a pH of $$3 is $$best described as:

Accepted Answer

Strongly acidic

Question 7

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is composed of nonpolar molecules, which do not interact favorably with water's polar molecules.

Question 8

Which of the following is an example of a synthesis (anabolic) reaction in the body?

Accepted Answer

Combining amino acids to form a protein.

Question 9

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

Accepted Answer

Enzymes decrease the activation energy, speeding up the rate of chemical reactions.

Question 10

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds form between the hydrogen atom of one water molecule and the oxygen atom of another water molecule.

Question 11

A buffer system in the body functions to:

Accepted Answer

Maintain a stable pH by neutralizing excess acids or bases.

Question 12

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

Accepted Answer

The sequence of amino acids in a polypeptide chain.

Question 13

Which of the following is a function of carbohydrates in the body?

Accepted Answer

Providing energy sources and structural support.

Question 14

Which of the following best explains why sodium ions (Na$$^+) $$and chloride ions (Cl$$^-) $$are attracted to each other in an ionic bond?

Accepted Answer

They have opposite charges, resulting in electrostatic attraction.

Question 15

Which of the following is true about the solubility of molecules in water?

Accepted Answer

Ionic and polar molecules dissolve easily in water.

Question 16

A patient is given a solution with a high concentration of hydrogen ions. What effect will this have on the pH of the solution?

Accepted Answer

The pH will decrease, making the solution more acidic.

Question 17

Which of the following best describes a decomposition (catabolic) reaction?

Accepted Answer

A large reactant is broken down into smaller products, releasing energy.

Question 18

Which of the following is a correct statement about nucleic acids?

Accepted Answer

They are built from nucleotides, which include a five-carbon sugar, a nitrogenous base, and a phosphate group.

Question 19

Which of the following is an example of an oxidation-reduction (redox) reaction?

Accepted Answer

The loss of an electron by one atom and the gain of that electron by another atom.

Question 20

Which of the following best describes the role of water in hydrolysis reactions?

Accepted Answer

Water is split into two parts that contribute to the formation of the products.

Atoms, Molecules, and Chemical Foundations in Anatomy & Physiology

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