Question 1

Which of the following statements correctly describes the charge, mass, and location of a neutron in an atom?

Accepted Answer

A neutron has no charge, a mass approximately equal to a proton, and is found in the nucleus.

Question 2

Which of the following best distinguishes an element from an atom?

Accepted Answer

An element is a substance made of only one type of atom, while an atom is the smallest unit of matter that retains the properties of an element.

Question 3

Which four elements make up approximately 96% of the human body’s mass?

Accepted Answer

Oxygen, Carbon, Hydrogen, Nitrogen

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 5

How are radioisotopes typically produced?

Accepted Answer

By altering the number of neutrons in the nucleus, often through nuclear reactions.

Question 6

A solution of salt water is an example of which type of mixture, and what is the solvent in this case?

Accepted Answer

Solution; water

Question 7

Which statement best explains why sodium (Na) readily forms ionic bonds with chlorine (Cl)?

Accepted Answer

Sodium has one electron in its valence shell, which it loses to achieve stability, while chlorine gains an electron to fill its valence shell.

Question 8

Which of the following best describes a hydrogen bond and its role in water’s surface tension?

Accepted Answer

A hydrogen bond is a weak attraction between a hydrogen atom in one molecule and an electronegative atom in another, resulting in water’s surface tension.

Question 9

Which of the following is true regarding the difference between a molecule, a compound, and an ion?

Accepted Answer

A molecule consists of two or more atoms bonded together; a compound is a molecule with different elements; an ion is an atom or molecule with a net charge.

Question 10

Which of the following chemical reactions is an example of a decomposition reaction?

Accepted Answer

$$2H_2O \rightarrow 2H_2 + O_2$

Question 11

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy, such as the breakdown of glucose.

Question 12

Which factor would most likely increase the rate of a chemical reaction in the human body?

Accepted Answer

Adding an enzyme specific to the reaction.

Question 13

Which property of water allows it to dissolve many substances important for physiological processes?

Accepted Answer

Its ability to form hydrogen bonds and act as a universal solvent.

Question 14

Why are lipids generally hydrophobic?

Accepted Answer

They contain long chains of nonpolar covalent bonds, which do not interact well with water.

Question 15

A solution has a pH of 4. Which of the following statements is correct?

Accepted Answer

The solution is acidic and has a high concentration of hydrogen ions.

Question 16

Which of the following best describes the function of a buffer in the human body?

Accepted Answer

A buffer maintains pH by releasing or binding hydrogen ions as needed.

Question 17

Which of the following is an example of a physiological role of an electrolyte?

Accepted Answer

Sodium ions ($$Na^+) $$help generate action potentials in neurons.

Question 18

Which reaction represents the hydrolysis of ATP, and what is its significance in the cell?

Accepted Answer

$$ATP + H_2O \rightarrow ADP + P_i + energy$$; it provides energy for cellular work.

Question 19

Which of the following best explains why protein shape is critical for its function?

Accepted Answer

The specific three-dimensional shape of a protein determines its ability to interact with other molecules.

Question 20

Which of the following correctly matches a macromolecule with its monomer?

Accepted Answer

Protein – amino acid

The Chemistry of Life: Study Notes for Anatomy & Physiology

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