Question 1

Which of the following best explains why water is considered the ideal medium for chemical reactions in the human body?

Accepted Answer

Water is a polar solvent, allowing it to dissolve and interact with a wide variety of solutes, including ions and polar molecules.

Question 2

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which element, found as a major cation in extracellular fluid, is most likely involved?

Accepted Answer

Sodium (Na)

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same atomic number but different mass numbers.

Question 4

Which type of chemical bond is primarily responsible for the surface tension of water, as seen when a water strider walks on a pond?

Accepted Answer

Hydrogen bond

Question 5

A molecule of sodium chloride (NaCl) dissolves in water. What happens to the sodium and chloride ions?

Accepted Answer

They become surrounded by water molecules, forming hydrated ions.

Question 6

Which of the following best describes an exergonic reaction?

Accepted Answer

A reaction that releases energy, with products having less potential energy than reactants.

Question 7

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

Accepted Answer

A molecule of glucose is broken down, and electrons are transferred to oxygen, forming water.

Question 8

Which property of water allows it to help regulate body temperature by absorbing and releasing large amounts of heat with little temperature change?

Accepted Answer

High heat capacity

Question 9

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

Accepted Answer

Buffers maintain homeostasis by resisting abrupt changes in pH.

Question 10

Which of the following is a distinguishing feature of organic compounds compared to inorganic compounds?

Accepted Answer

Organic compounds always contain carbon and hydrogen.

Question 11

A patient is diagnosed with a deficiency in iodine. Which physiological process is most likely to be affected?

Accepted Answer

Synthesis of thyroid hormones

Question 12

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

Accepted Answer

A molecule is made of atoms of the same element, while a compound is made of atoms of different elements.

Question 13

Which of the following equations represents a synthesis (anabolic) reaction?

Accepted Answer

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

Question 14

Which of the following best explains why noble gases such as helium and neon are chemically inert?

Accepted Answer

They have a full complement of electrons in their outermost shell.

Question 15

Which of the following is a correct statement about ATP?

Accepted Answer

ATP is the principal energy-storing molecule in the body, produced during cellular respiration.

Question 16

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

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, resulting in partial charges, while nonpolar covalent bonds involve equal sharing.

Question 17

Which of the following is a trace element in the human body, and what is its primary function?

Accepted Answer

Iron; oxygen transport in hemoglobin

Question 18

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

Accepted Answer

Enzymes lower the activation energy, speeding up chemical reactions.

Question 19

Which of the following is a correct example of a decomposition (catabolic) reaction?

Accepted Answer

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

Question 20

Which of the following best describes the structure of a triglyceride?

Accepted Answer

A glycerol molecule bonded to three fatty acids by dehydration synthesis.

The Chemical Level of Organization: Foundations for Anatomy & Physiology

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