Question 1

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

Accepted Answer

Water's polar covalent bonds allow it to surround and dissociate ionic and polar molecules, forming hydration spheres.

Question 2

A patient is given a radioactive isotope for diagnostic imaging. Which property of radioisotopes makes them useful for this purpose?

Accepted Answer

They undergo radioactive decay, emitting energy that can be detected by imaging equipment.

Question 3

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

Accepted Answer

A molecule consists of two or more atoms of the same element, while a compound consists of atoms of different elements.

Question 4

Which of the following equations represents a hydrolysis reaction?

Accepted Answer

$$AB + H_2O \rightarrow AH + BOH$$

Question 5

A solution has a pH of 5. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a higher concentration of $$H^+$$ ions than pure water.

Question 6

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

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed more rapidly.

Question 7

Which of the following is a physiological consequence of an electrolyte imbalance in the body?

Accepted Answer

Disturbance of vital body functions such as nerve impulse transmission and muscle contraction.

Question 8

Which of the following statements about the structure of proteins is correct?

Accepted Answer

The primary structure is the sequence of amino acids in a polypeptide chain.

Question 9

A patient’s blood pH drops to 7.1. Which buffer system is most important in helping restore normal pH?

Accepted Answer

The carbonic acid–bicarbonate buffer system

Question 10

Which of the following best explains why saturated fatty acids are solid at room temperature while unsaturated fatty acids are liquid?

Accepted Answer

Saturated fatty acids have only single bonds, allowing them to pack closely together.

Question 11

Which of the following is a correct example of a dehydration synthesis reaction?

Accepted Answer

$$AH + BOH \rightarrow AB + H_2O$$

Question 12

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is double-stranded and contains deoxyribose, while RNA is single-stranded and contains ribose.

Question 13

Which of the following functional groups acts as a base and is found in amino acids?

Accepted Answer

Amino group ($$-NH_2$)

Question 14

Which of the following best describes the physiological importance of cholesterol?

Accepted Answer

It is a component of plasma membranes and a precursor for steroid hormones.

Question 15

A solution contains a high concentration of $$Na^+$$ and $$Cl^-$$ ions. Which term best describes this solution?

Accepted Answer

Electrolyte solution

Question 16

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups.

Question 17

Which of the following best describes the effect of denaturation on a protein?

Accepted Answer

It causes the protein to lose its three-dimensional structure and function.

Question 18

Which of the following is a property of water that helps maintain body temperature homeostasis?

Accepted Answer

High heat capacity

Question 19

Which of the following best explains why glucose is considered a monosaccharide?

Accepted Answer

It is a simple sugar with a single ring structure and is the main metabolic fuel in the body.

Question 20

Which of the following best describes the difference between hydrophilic and hydrophobic molecules?

Accepted Answer

Hydrophilic molecules interact readily with water, while hydrophobic molecules do not.

The Chemical Level of Organization: Foundations for Anatomy & Physiology

Study Guide - Practice Questions