Question 1

Which of the following best describes the difference between a mixture and a compound?

Accepted Answer

Mixtures can be separated by physical means, while compounds require chemical reactions to separate.

Question 2

A patient is exposed to a radionuclide for diagnostic imaging. Which property of radionuclides makes them useful for this purpose?

Accepted Answer

They undergo radioactive decay, releasing energy that can be traced.

Question 3

Which equation correctly represents the relationship between energy, mass, and the speed of light, as described by Einstein?

Accepted Answer

$$E = mc^2$

Question 4

Which of the following is a correct example of a chemical reaction?

Accepted Answer

Burning glucose in the presence of oxygen to produce carbon dioxide and water.

Question 5

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 H$$^+$$ ions.

Question 6

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

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and speeding up reactions.

Question 7

Which formula represents the general structure of an amino acid?

Accepted Answer

$$\mathrm{NH_2${-}CHR{-}COOH}$$

Question 8

A buffer system in the blood helps maintain pH homeostasis. If excess acid is added to the blood, what is the buffer’s response?

Accepted Answer

It binds to H$$^+$$ ions, minimizing the change in pH.

Question 9

Which of the following is NOT a function of ATP in the cell?

Accepted Answer

Serving as a building block for nucleic acids.

Question 10

Which statement best explains why proteins can have such diverse functions in the body?

Accepted Answer

Proteins have complex three-dimensional structures determined by their amino acid sequence.

Question 11

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

Accepted Answer

A molecule composed of a sugar, a phosphate group, and a nitrogenous base.

Question 12

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 13

A patient’s blood pH drops from 7.4 to 7.0. What is the change in hydrogen ion concentration?

Accepted Answer

It increases by a factor of 10.

Question 14

Which of the following is a correct representation of a peptide bond formation between two amino acids?

Accepted Answer

$$\mathrm{NH_2${-}CHR{-}COOH} + \mathrm{NH_2${-}CHR{-}COOH} \rightarrow \mathrm{NH_2${-}CHR{-}CO{-}NH{-}CHR{-}COOH} + H_2O$$

Question 15

Which of the following best explains the denaturation of a protein?

Accepted Answer

Disruption of the protein’s secondary, tertiary, or quaternary structure without breaking peptide bonds.

Question 16

Which of the following is a correct example of a carbohydrate?

Accepted Answer

Glucose ($$\mathrm{C_6H_{12}O_6$})$$

Question 17

Which of the following is a correct description of the structure of ATP?

Accepted Answer

A nucleotide with three phosphate groups attached to adenosine.

Question 18

Which of the following statements about atoms and elements is correct?

Accepted Answer

An atom is the smallest unit of an element that retains its chemical properties.

Question 19

Which of the following is a correct example of an acid-base reaction?

Accepted Answer

$$\mathrm{HCl} + \mathrm{NaOH} \rightarrow \mathrm{NaCl} + \mathrm{H_2O}$$

Question 20

Which of the following best describes the difference between fibrous and globular proteins?

Accepted Answer

Fibrous proteins provide structural support, while globular proteins are functional and involved in metabolic processes.

Chapter 2: Chemistry Comes Alive – Study Notes for Anatomy & Physiology I

Study Guide - Practice Questions