$$\text{Atomic\ weight} = \sum (\text{isotope\ mass} \times \text{fractional\ abundance})$$

$$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{energy}$$

$$\text{A} + \text{B} \rightarrow \text{AB}$$

Question 1

Which of the following best defines an isotope?

Accepted Answer

An atom with the same number of protons but a different number of neutrons compared to other atoms of the same element.

Question 2

Which equation correctly represents the calculation of atomic weight?

Accepted Answer

$$	ext{Atomic\ weight} = \sum (	ext{isotope\ mass} 	imes 	ext{fractional\ abundance})$$

Question 3

A patient is diagnosed with acidosis. Which of the following best describes the pH of their blood?

Accepted Answer

$$	ext{pH} \u003c 7.35$$

Question 4

Which of the following best describes a covalent bond?

Accepted Answer

A chemical bond formed by the sharing of electron pairs between atoms.

Question 5

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

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{energy}$$

Question 6

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

They lower the activation energy required for chemical reactions to occur.

Question 7

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in the high-energy phosphate bonds and releases it when converted to ADP.

Question 8

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.

Question 9

A solution contains $$0.01$$ moles of $$	ext{H}^+$$ per liter. What is the pH of the solution?

Accepted Answer

$$	ext{pH} = 2$$

Question 10

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

Accepted Answer

A substance that minimizes changes in pH by accepting or donating hydrogen ions.

Question 11

Which of the following is a correct example of a synthesis (anabolic) reaction?

Accepted Answer

$$	ext{A} + 	ext{B} ightarrow 	ext{AB}$$

Question 12

Which of the following best describes the role of dehydration synthesis in the formation of macromolecules?

Accepted Answer

It joins monomers by removing a molecule of water.

Question 13

Which of the following is a property of water that is essential for life and is due to hydrogen bonding?

Accepted Answer

High surface tension

Question 14

Which of the following best describes the difference between organic and inorganic compounds?

Accepted Answer

Organic compounds contain carbon-hydrogen bonds, while inorganic compounds generally do not.

Question 15

Which of the following is a correct description of an endergonic reaction?

Accepted Answer

A reaction that absorbs energy from its surroundings.

Question 16

Which of the following best describes the function of nucleic acids in the human body?

Accepted Answer

They store and transmit genetic information.

Question 17

A patient is found to have a deficiency in essential fatty acids. Which of the following is a likely consequence?

Accepted Answer

Impaired cell membrane structure and function.

Question 18

Which of the following best describes the role of proteins in the human body?

Accepted Answer

They serve as enzymes, structural components, and signaling molecules.

Question 19

Which of the following best explains why ATP is often called the 'energy currency' of the cell?

Accepted Answer

ATP provides readily available energy for cellular processes by hydrolyzing its phosphate bonds.

Question 20

Which of the following best describes the process of hydrolysis?

Accepted Answer

A chemical reaction that breaks bonds between monomers by adding water.

Fundamental Concepts in Chemistry and Biochemistry for Anatomy & Physiology

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