Question 1

Which of the following best describes the difference between potential and kinetic energy in the context of muscle contraction?

Accepted Answer

Potential energy is stored in the chemical bonds of ATP before contraction, while kinetic energy is the movement of muscle fibers during contraction.

Question 2

Which four elements make up approximately 96% of the human body’s mass?

Accepted Answer

Oxygen, Carbon, Hydrogen, Nitrogen

Question 3

An atom consists of protons, neutrons, and electrons. Which statement correctly describes their charges and locations?

Accepted Answer

Protons are positively charged and located in the nucleus; neutrons are neutral and also in the nucleus; electrons are negatively charged and orbit the nucleus.

Question 4

Which of the following best distinguishes a compound from a mixture?

Accepted Answer

A compound consists of two or more different atoms chemically bonded, while a mixture is a physical blend of substances without chemical bonding.

Question 5

Which type of chemical bond is responsible for the formation of table salt (NaCl)?

Accepted Answer

Ionic bond

Question 6

A water molecule ($$\mathrm{H_2O}) is an $$example of which type of compound?

Accepted Answer

Polar compound

Question 7

Which of the following best describes a synthesis reaction?

Accepted Answer

A reaction where two or more substances combine to form a larger molecule ($$A + B \rightarrow AB)$$

Question 8

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

Accepted Answer

Increasing the concentration of reactants

Question 9

Why is water considered essential for body homeostasis?

Accepted Answer

It serves as a solvent, regulates temperature, provides cushioning, and participates in chemical reactions.

Question 10

A solution has a pH of 3. Which statement is true about this solution?

Accepted Answer

It is acidic and releases $$\mathrm{H^+}$$ ions.

Question 11

Which process is responsible for breaking down a polysaccharide into monosaccharides in the digestive system?

Accepted Answer

Hydrolysis

Question 12

Which of the following is a function of lipids in the human body?

Accepted Answer

Energy storage, insulation, and forming cell membranes

Question 13

Which level of protein structure is directly responsible for the unique three-dimensional shape of a protein?

Accepted Answer

Tertiary structure

Question 14

Enzymes speed up chemical reactions by:

Accepted Answer

Lowering the activation energy required for the reaction

Question 15

Which statement best describes the difference between DNA and RNA?

Accepted Answer

DNA contains the genetic code, while RNA is involved in protein synthesis.

Question 16

ATP is often referred to as the 'energy currency' of the cell. Which equation best represents the release of energy from ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H_2O} ightarrow \mathrm{ADP} + \mathrm{P_i} + 	ext{energy}$$

Question 17

A patient is experiencing muscle cramps due to an electrolyte imbalance. Which inorganic compound is most likely involved in this scenario?

Accepted Answer

Salt

Question 18

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

Accepted Answer

$$AB + C \rightarrow AC + B$$

Question 19

Which property of water allows it to regulate body temperature effectively?

Accepted Answer

High heat capacity

Question 20

A patient’s blood pH drops from 7.4 to 6.8. What does this indicate about the concentration of $$\mathrm{H^+}$$ ions?

Accepted Answer

The concentration of $$\mathrm{H^+}$$ ions has increased.

Chemistry Comes Alive: Foundations for Anatomy & Physiology

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