Question 1

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond when they react to create sodium chloride (NaCl)?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 2

A patient is found to have a blood pH of 7.25. Which of the following statements is correct regarding this condition?

Accepted Answer

The blood is acidic, indicating a higher concentration of hydrogen ions than normal.

Question 3

Which of the following best describes the difference between dehydration synthesis and hydrolysis in the formation and breakdown of biological polymers?

Accepted Answer

Dehydration synthesis removes water to join monomers, while hydrolysis adds water to break polymers into monomers.

Question 4

Which of the following molecules is classified as a polysaccharide and serves as a storage form of energy in animals?

Accepted Answer

Glycogen

Question 5

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is the pH of this solution?

Accepted Answer

$$4$$

Question 6

Which of the following statements about phospholipids is correct?

Accepted Answer

Their hydrophilic heads interact with water, while their hydrophobic tails do not, making them essential for cell membrane structure.

Question 7

Which of the following best describes the role of buffers in the human body?

Accepted Answer

Buffers maintain a stable pH by neutralizing excess acids or bases.

Question 8

A molecule of water (H$$_2O) is $$formed by which type of chemical bond?

Accepted Answer

Polar covalent bond between hydrogen and oxygen

Question 9

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA is made of nucleotides, each containing a phosphate group, deoxyribose sugar, and a nitrogenous base.

Question 10

Which of the following best explains why carbon is found in all organic molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing it to create complex and diverse molecular structures.

Question 11

A patient is given an intravenous solution containing NaCl. What happens to the NaCl when it enters the bloodstream?

Accepted Answer

NaCl dissociates into Na$$^+$$ and Cl$$^-$$ ions, which are electrolytes essential for nerve impulses.

Question 12

Which of the following best describes the difference between fibrous and globular proteins?

Accepted Answer

Fibrous proteins are structural and provide support, while globular proteins function as enzymes, hormones, or antibodies.

Question 13

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

Accepted Answer

$$\mathrm{A} + \mathrm{B} \rightarrow \mathrm{AB}$$

Question 14

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the bonds between its three phosphate groups, and energy is released when these bonds are broken.

Question 15

Which of the following best explains why water is considered an excellent solvent in biological systems?

Accepted Answer

Water is a polar molecule, allowing it to dissolve many ionic and polar substances.

Question 16

Which of the following is a correct statement about acids and bases?

Accepted Answer

Bases release hydroxyl ions (OH$$^-) in $$water and accept protons.

Question 17

Which of the following best describes the relationship between the pH scale and hydrogen ion concentration?

Accepted Answer

A decrease of 1 pH unit represents a tenfold increase in hydrogen ion concentration.

Question 18

Which of the following is a correct example of a compound?

Accepted Answer

CO$$_2$$

Question 19

Which of the following statements about organic and inorganic compounds is correct?

Accepted Answer

Organic compounds always contain carbon and are typically large, covalent molecules.

Question 20

Which of the following best explains why ions are important in the human body?

Accepted Answer

Ions such as Na$$^+$$ and K$$^+$$ are essential for conducting electrical impulses in nerves and muscles.

Chapter 2: Basic Chemistry – Foundations for Anatomy & Physiology

Study Guide - Practice Questions

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