Question 1

Which of the following best describes the difference between a physical change and a chemical change in matter?

Accepted Answer

A physical change does not alter the basic nature of a substance, while a chemical change alters the chemical composition.

Question 2

Which statement about the three states of matter is correct?

Accepted Answer

Solids have a definite shape and volume.

Question 3

Which of the following is an example of kinetic energy in the human body?

Accepted Answer

A nerve impulse traveling along a neuron

Question 4

Which element makes up the largest percentage of the human body's mass?

Accepted Answer

Oxygen

Question 5

An atom of sodium (Na) loses one electron to become a sodium ion (Na⁺). What type of chemical bond is most likely to form between sodium and chlorine (Cl)?

Accepted Answer

Ionic bond

Question 6

Which of the following best describes a molecule of water (H$$_2O$$)?

Accepted Answer

It is a polar covalent molecule.

Question 7

What is the main reason why water is considered an excellent solvent in biological systems?

Accepted Answer

Water is polar and can dissolve ionic and polar substances.

Question 8

Which of the following best explains why saturated fats are solid at room temperature?

Accepted Answer

They contain only single covalent bonds, allowing molecules to pack closely together.

Question 9

A solution has a pH of 5. How does its hydrogen ion concentration compare to a solution with a pH of 7?

Accepted Answer

It is 100 times higher.

Question 10

Which of the following is a polymer formed by dehydration synthesis?

Accepted Answer

Glycogen

Question 11

Which of the following is true about enzymes?

Accepted Answer

They are proteins that act as biological catalysts.

Question 12

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

Accepted Answer

Storing genetic information

Question 13

Which statement correctly describes the structure of DNA?

Accepted Answer

DNA is a double-stranded helix containing thymine.

Question 14

Which of the following is a correct example of a neutralization reaction?

Accepted Answer

$$\mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{H}_2\mathrm{O} + \mathrm{NaCl}$$

Question 15

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

Accepted Answer

Buffers regulate pH changes by accepting or donating hydrogen ions.

Question 16

Which of the following is a property of water that is critical for maintaining body temperature?

Accepted Answer

High heat capacity

Question 17

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They have a hydrophilic head and hydrophobic tails, allowing formation of a bilayer.

Question 18

Which of the following is true about ATP (adenosine triphosphate)?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds.

Question 19

Which of the following is a correct description of a synthesis reaction?

Accepted Answer

A reaction in which atoms or molecules combine to form a larger, more complex molecule.

Question 20

Which of the following is true regarding the atomic number of an element?

Accepted Answer

It is equal to the number of protons in the atom.

The Chemical Level of Organization: Essentials of Human Anatomy & Physiology

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