Question 1

Which of the following statements best describes the difference between an element and a compound?

Accepted Answer

An element is a substance that cannot be broken down into a simpler substance by chemical means, while a compound consists of two or more elements chemically combined.

Question 2

A patient is exposed to a radioisotope for medical imaging. Which property of radioisotopes makes them useful for this purpose?

Accepted Answer

They are unstable and release energy or radiation through radioactive decay, allowing detection.

Question 3

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

Accepted Answer

Water is a polar covalent molecule, allowing it to dissolve ionic and polar covalent solutes by surrounding and separating them.

Question 4

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

Accepted Answer

pH = 4

Question 5

Which of the following is TRUE regarding the octet rule?

Accepted Answer

Atoms are most stable when their outermost shell contains eight electrons.

Question 6

A triglyceride is formed by joining three fatty acids to a glycerol molecule. Which process is responsible for this formation?

Accepted Answer

Dehydration synthesis

Question 7

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

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and increasing the reaction rate without being consumed.

Question 8

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

Accepted Answer

$$AB \rightarrow A + B$$

Question 9

A molecule of DNA contains the following bases: adenine, guanine, cytosine, and thymine. Which base pairing is correct according to complementary base pairing?

Accepted Answer

A pairs with T and C pairs with G

Question 10

Which of the following best describes a buffer in the context of body fluids?

Accepted Answer

A buffer is a substance that resists changes in pH by either accepting or donating hydrogen ions.

Question 11

Which of the following is a property of fibrous proteins?

Accepted Answer

They are long, rope-like, and provide structural support and strength.

Question 12

Which of the following best describes the amphiphilic nature of phospholipids and its importance?

Accepted Answer

Phospholipids have both a polar phosphate head and nonpolar fatty acid tails, enabling them to form cell membranes.

Question 13

A patient’s blood pH is measured at 7.35. Which of the following best describes this value?

Accepted Answer

The blood is slightly basic.

Question 14

Which of the following is TRUE about the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds and are solid at room temperature, while unsaturated fatty acids have one or more double bonds and are liquid at room temperature.

Question 15

Which of the following is a correct example of an exchange reaction?

Accepted Answer

$$AB + CD \rightarrow AD + BC$$

Question 16

Which of the following is NOT a property of enzymes?

Accepted Answer

Enzymes are consumed during the reaction and cannot be reused.

Question 17

Which of the following best describes the process of hydrolysis?

Accepted Answer

Hydrolysis breaks a polymer into monomers by adding a water molecule.

Question 18

Which of the following is TRUE regarding the structure of nucleotides?

Accepted Answer

Nucleotides consist of a pentose sugar, a phosphate group, and a nitrogenous base.

Question 19

Which of the following best explains why ionic bonds form between metal and nonmetal atoms?

Accepted Answer

Metal atoms transfer electrons to nonmetal atoms, resulting in the formation of cations and anions held together by electrostatic attraction.

Anatomy & Physiology: Chemistry of Life Study Guide (Chapter 2)

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