Question 1

Which of the following best explains why water has a high heat capacity and high heat of vaporization?

Accepted Answer

Because hydrogen bonding between water molecules requires significant energy to break.

Question 2

A patient is experiencing respiratory depression, leading to decreased breathing rate. Using the bicarbonate buffer system equation $$\mathrm{H_2O + CO_2$ \rightleftharpoons H_2CO_3 \rightleftharpoons H^+ + $$HCO_3$$^-}$$, what will happen to the patient's blood pH?

Accepted Answer

Blood pH will decrease because $$\mathrm{CO_2$}$$ accumulates, shifting the equation right and increasing $$\mathrm{H^+}.$$

Question 3

Which statement correctly describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve sharing electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another.

Question 4

Which of the following elements is NOT one of the four major elements found in the human body?

Accepted Answer

Calcium (Ca)

Question 5

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

Accepted Answer

$$4$$

Question 6

Which of the following best describes a buffer in biological systems?

Accepted Answer

A buffer is a weak acid or base that resists changes in pH by reversibly binding or releasing $$\mathrm{H^+}$$ ions.

Question 7

Which of the following is true regarding the structure of an atom?

Accepted Answer

Protons and neutrons are found in the nucleus, while electrons orbit in shells around the nucleus.

Question 8

Which of the following molecules is formed by dehydration synthesis of two monosaccharides?

Accepted Answer

Disaccharide

Question 9

A protein loses its tertiary structure due to exposure to extreme heat. What is this process called?

Accepted Answer

Denaturation

Question 10

Which of the following best explains why sodium (Na) and chlorine (Cl) form an ionic bond?

Accepted Answer

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

Question 11

Which of the following is a function of water in the human body that is NOT directly related to hydrogen bonding?

Accepted Answer

Cushioning of organs

Question 12

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for reactions.

Question 13

Which of the following is true about the DNA molecule?

Accepted Answer

DNA is a double-stranded helical molecule found in the nucleus.

Question 14

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP is the source of immediately usable energy for cellular work.

Question 15

Which of the following is a correct application of the law of mass action to the bicarbonate buffer system $$\mathrm{H_2O + CO_2$ \rightleftharpoons H_2CO_3 \rightleftharpoons H^+ + $$HCO_3$$^-}$$?

Accepted Answer

Removing $$\mathrm{CO_2$}$$ will shift the equilibrium to the left, decreasing $$\mathrm{H^+}.$$

Question 16

Which of the following is a property of organic compounds?

Accepted Answer

They contain carbon and are covalently bonded.

Question 17

Which of the following factors will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the concentration of reactants

Question 18

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

Accepted Answer

Fibrous proteins are extended and strand-like, providing structural support, while globular proteins are compact and functional (e.g., enzymes, antibodies).

Question 19

Which of the following is true about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 20

Which of the following is a correct description of the role of phospholipids in the body?

Accepted Answer

Phospholipids are the chief component of cell membranes due to their polar and nonpolar regions.

Chemistry Foundations for Anatomy & Physiology: Study Notes

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