Question 1

Which of the following best describes the difference between kinetic and potential energy in the context of human physiology?

Accepted Answer

Kinetic energy is the energy of motion, such as blood flow, while potential energy is stored energy, such as in chemical bonds.

Question 2

A sodium atom (Na) has 11 protons and 11 electrons. When it forms an ion, it loses one electron. What is the resulting charge and why?

Accepted Answer

The resulting ion is positively charged because it has more protons than electrons.

Question 3

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has an uneven distribution of electrons, making one end slightly negative and the other slightly positive.

Question 4

Which statement correctly describes the octet rule as it applies to atoms in the human body?

Accepted Answer

Atoms are most stable when their outermost shell contains 8 electrons, except for the first shell which is stable with 2 electrons.

Question 5

A chemical reaction in the body releases energy and results in products with less potential energy than the reactants. Which type of reaction is this?

Accepted Answer

Exergonic reaction

Question 6

Which of the following best describes a buffer system in the human body?

Accepted Answer

A buffer system resists abrupt changes in pH by releasing or binding hydrogen ions.

Question 7

If a solution has a pH of 3, which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of hydrogen ions.

Question 8

Which of the following is an example of a decomposition reaction in the human body?

Accepted Answer

The breakdown of glycogen into glucose molecules.

Question 9

Which factor would most likely increase the rate of a chemical reaction in a cell?

Accepted Answer

Adding an enzyme to act as a catalyst.

Question 10

A molecule of glucose ($$C_6H_{12}O_6$) is formed by the bonding of carbon, hydrogen, and oxygen atoms. What type of bond primarily holds these atoms together?

Accepted Answer

Covalent bonds

Question 11

Which of the following best explains why ions are important for maintaining homeostasis in the human body?

Accepted Answer

Ions conduct electrical currents in solution, which is essential for nerve and muscle function.

Question 12

Which of the following is a correct statement about acids and bases?

Accepted Answer

Acids release hydrogen ions ($$H^+) in $$solution, while bases release hydroxide ions ($$OH^-).$$

Question 13

A patient is experiencing a rapid drop in blood pH. Which buffer system is most likely to help resist this change?

Accepted Answer

The bicarbonate buffer system ($$HCO_3$$^-$$)

Question 14

Which of the following best describes a monosaccharide?

Accepted Answer

A single sugar molecule, such as glucose, with 3-7 carbon atoms.

Question 15

Which of the following is a correct example of a polar covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in a water molecule.

Question 16

A solution is described as a sol-gel. Which of the following best describes this property in the context of a cell?

Accepted Answer

The cytosol of the cell can behave as both a solid and a liquid, allowing for dynamic cellular processes.

Question 17

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

Accepted Answer

Hydrogen bonds between water molecules require a large amount of energy to break.

Question 18

Which of the following is true regarding the relationship between pH and hydrogen ion concentration?

Accepted Answer

As pH decreases, hydrogen ion concentration increases.

Question 19

A mixture of water and blood cells is best described as which type of mixture?

Accepted Answer

Suspension

Question 20

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

Accepted Answer

Enzymes act as catalysts to increase the rate of chemical reactions without being consumed.

Fundamental Chemistry Concepts for Anatomy & Physiology

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