Question 1

Which of the following best describes the difference between an atom and an element?

Accepted Answer

An atom is the smallest unit of matter that retains the properties of an element, while an element is a pure substance consisting of only one type of atom.

Question 2

Which equation correctly represents the relationship between atomic number ($$Z$$), mass number ($$A$$), number of protons ($$p$$), and number of neutrons ($$n$$)?

Accepted Answer

$$A = Z + n$$

Question 3

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 4

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

Accepted Answer

Water has a bent shape and unequal sharing of electrons, resulting in partial charges on the oxygen and hydrogen atoms.

Question 5

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

Accepted Answer

Forming a disaccharide from two monosaccharides with the removal of a water molecule.

Question 6

Which statement best describes the role of enzymes in chemical reactions?

Accepted Answer

Enzymes lower the activation energy, speeding up chemical reactions without being consumed.

Question 7

A buffer solution is added to a solution with a pH of 5. What is the primary function of the buffer?

Accepted Answer

To maintain the pH by neutralizing added acids or bases.

Question 8

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

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

Question 9

Which of the following is true regarding ATP hydrolysis in cells?

Accepted Answer

ATP hydrolysis releases energy that can be used for cellular work.

Question 10

Which of the following best explains why proteins have four levels of structure?

Accepted Answer

The four levels of structure allow proteins to fold into specific shapes necessary for their function.

Question 11

Which of the following is a correct statement about isotopes?

Accepted Answer

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

Question 12

Which of the following best describes a hydrophobic molecule?

Accepted Answer

A molecule that repels water and does not dissolve easily due to its nonpolar nature.

Question 13

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

Accepted Answer

The synthesis of proteins from amino acids.

Question 14

Which of the following is a correct description of a polymer?

Accepted Answer

A polymer is a large molecule made up of repeating monomer units.

Question 15

Which of the following best explains the importance of protein shape for its function?

Accepted Answer

Protein shape determines its ability to interact with specific molecules and carry out its biological function.

Question 16

Which of the following is a property of acids?

Accepted Answer

Acids increase the concentration of hydrogen ions ($$H^+) in $$solution.

Question 17

Which of the following is a correct statement about surface tension in water?

Accepted Answer

Surface tension is due to hydrogen bonds between water molecules.

Question 18

Which of the following best describes the relationship between monomers and polymers?

Accepted Answer

Polymers are formed by joining monomers together through chemical reactions.

Question 19

Which of the following is a correct statement about the role of carbohydrates in the human body?

Accepted Answer

Carbohydrates serve as a primary source of quick energy for cells.

Question 20

A patient is experiencing muscle fatigue due to low ATP levels. Which reaction is most directly responsible for releasing energy to the muscle cells?

Accepted Answer

ATP + H$$_2O$$ $$\rightarrow$$ ADP + P$$_i + $$energy

Fundamental Chemistry Concepts for Anatomy & Physiology

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