Question 1

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

Accepted Answer

A compound is formed when two or more different kinds of atoms bind together chemically, while a mixture is a physical combination of substances.

Question 2

Which statement about water is correct based on its chemical properties?

Accepted Answer

Water has a high heat of vaporization, meaning it requires a large amount of energy to change from liquid to gas.

Question 3

A solution is made by dissolving 5 grams of NaCl in 100 mL of water. Which term best describes NaCl in this scenario?

Accepted Answer

Solute

Question 4

Which of the following is a trace element essential for the human body?

Accepted Answer

Zinc

Question 5

Which of the following best explains why water is considered the 'universal solvent'?

Accepted Answer

Water can dissolve many ionic and polar substances due to its polarity.

Question 6

A buffer in the blood helps maintain pH by:

Accepted Answer

Releasing hydrogen ions when pH rises and binding hydrogen ions when pH drops.

Question 7

Which of the following is true about proteins?

Accepted Answer

Proteins are composed of amino acids joined by peptide bonds.

Question 8

Which of the following best describes 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 9

A patient’s blood pH is measured at 7.2. Based on the information provided, this patient’s blood is:

Accepted Answer

Acidic

Question 10

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

Accepted Answer

Enzymes are biological catalysts that speed up chemical reactions without being consumed.

Question 11

Which of the following best describes a nucleotide?

Accepted Answer

A molecule composed of a phosphate, sugar, and nitrogen-containing base.

Question 12

Which equation correctly represents the dissociation of hydrochloric acid (HCl) in water?

Accepted Answer

$$\mathrm{HCl} \rightarrow \mathrm{H}^+ + \mathrm{Cl}^-$$

Question 13

Which of the following statements about carbohydrates is correct?

Accepted Answer

Carbohydrates are composed of sugars and serve as a major source of cellular fuel.

Question 14

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP serves as the energy carrier molecule in the cell.

Question 15

A molecule of sodium chloride (NaCl) is formed by:

Accepted Answer

Transferring an electron from sodium to chlorine, resulting in ionic bonding.

Question 16

Which of the following is a property of acids?

Accepted Answer

Acids release hydrogen ions ($$\mathrm{H}^+) in $$solution.

Question 17

Which of the following is a correct statement about lipids?

Accepted Answer

Lipids are insoluble in water and serve as energy storage molecules.

Question 18

Which of the following best describes a solution with a pH of 2?

Accepted Answer

Strongly acidic

Question 19

Which of the following is a correct description of a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 20

Which of the following best explains the function of buffers in biological systems?

Accepted Answer

Buffers help maintain a stable pH by releasing or binding hydrogen ions as needed.

Fundamental Concepts in Anatomy & Physiology: Matter, Elements, Chemical Bonds, and Biomolecules

Guida di studio - Domande di pratica