Question 1

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

Accepted Answer

Potential energy is stored energy, such as in chemical bonds or gradients, while kinetic energy is the energy of movement, such as muscle contraction.

Question 2

Which of the following elements makes up the largest percentage of the human body by mass?

Accepted Answer

Oxygen ($$O)$$

Question 3

A molecule of water ($$H_2O) is $$formed by which type of chemical bond?

Accepted Answer

Covalent bond

Question 4

Which of the following best explains why sodium chloride ($$NaCl) $$dissolves in water to form an electrolyte?

Accepted Answer

Because $$NaCl$$ dissociates into $$Na^+$$ and $$Cl^-$$ ions, which conduct electricity in solution.

Question 5

Which of the following reactions represents a decomposition reaction?

Accepted Answer

$$AB \rightarrow A + B$$

Question 6

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

Accepted Answer

The solution is acidic and has more $$H^+$$ ions than $$OH^-$$ ions.

Question 7

Which property of water allows it to absorb and release large amounts of heat with little change in temperature, helping to maintain body temperature?

Accepted Answer

High heat capacity

Question 8

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

Accepted Answer

DNA stores genetic information, while RNA is involved in protein synthesis.

Question 9

Which of the following is NOT a factor that increases the rate of chemical reactions in the human body?

Accepted Answer

Removing catalysts

Question 10

Which of the following best describes the process of dehydration synthesis?

Accepted Answer

Forming larger molecules from smaller ones by removing water.

Question 11

Which of the following is a correct example of a polysaccharide and its function?

Accepted Answer

Starch; stores energy in plants.

Question 12

Which level of protein structure is defined by the sequence of amino acids in a polypeptide chain?

Accepted Answer

Primary structure

Question 13

Which of the following best explains why enzymes are important in biological systems?

Accepted Answer

They act as catalysts to increase the rate of chemical reactions.

Question 14

Which of the following is a correct description of a hydrogen bond?

Accepted Answer

A bond formed by the attraction between a hydrogen atom and an electronegative atom, such as oxygen.

Question 15

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for cellular processes by releasing a phosphate group.

Question 16

Which of the following is true about isotopes?

Accepted Answer

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

Question 17

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

Accepted Answer

$$AB + CD \rightarrow AD + CB$$

Question 18

Which of the following statements about acids and bases is correct?

Accepted Answer

Acids release $$H^+$$ ions in solution.

Question 19

Which of the following best describes the difference between polar and nonpolar molecules?

Accepted Answer

Polar molecules have unequal sharing of electrons and a separation of charge, while nonpolar molecules have equal sharing and no separation of charge.

Question 20

Which of the following is a correct statement about the structure of atoms?

Accepted Answer

Neutrons have no charge and reside in the nucleus.

Chemistry Foundations for Anatomy & Physiology: Mini-Textbook Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard