Question 1

Which of the following best describes the difference between a physical change and a chemical change in matter?

Accepted Answer

A physical change does not alter the basic nature of a substance, while a chemical change alters its chemical composition.

Question 2

A patient is given a radioactive isotope for a PET scan. What property of radioisotopes makes them useful for this procedure?

Accepted Answer

They decompose to more stable isotopes, emitting particles and energy that can be tracked.

Question 3

Which of the following elements is essential for muscle contraction, nerve conduction, and blood clotting?

Accepted Answer

Calcium

Question 4

What is the main difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve transferring electrons, while covalent bonds involve sharing electrons.

Question 5

Which of the following best explains why water is considered the 'universal solvent'?

Accepted Answer

Water can dissolve a wide variety of solutes due to its polarity.

Question 6

A solution has a pH of 4. Which of the following statements is true about this solution?

Accepted Answer

It is acidic and has a higher concentration of hydrogen ions than a solution with pH 7.

Question 7

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

Accepted Answer

Amino acids are joined together to form a protein.

Question 8

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy and increase the rate of chemical reactions.

Question 9

Which of the following best describes the structure of a phospholipid?

Accepted Answer

A molecule with a polar phosphorus-containing head and two nonpolar fatty acid tails.

Question 10

Which of the following is true regarding the difference between organic and inorganic compounds?

Accepted Answer

Inorganic compounds do not contain carbon, while organic compounds contain carbon and are usually large, covalently bonded molecules.

Question 11

A molecule of sucrose is broken down into glucose and fructose in the body. What type of reaction is this?

Accepted Answer

Hydrolysis

Question 12

Which of the following is a trace element essential for the production of thyroid hormones?

Accepted Answer

Iodine

Question 13

Which of the following best describes a buffer in the context of body chemistry?

Accepted Answer

A chemical that can regulate or change pH by accepting or donating hydrogen ions.

Question 14

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its high-energy phosphate bonds, which is released when these bonds are broken.

Question 15

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

Accepted Answer

ATP transfers its terminal phosphate group to glucose to form glucose-phosphate and ADP.

Question 16

Which of the following is true about the atomic number of an element?

Accepted Answer

It is equal to the number of protons in the atom.

Question 17

Which of the following best explains why saturated fats are solid at room temperature?

Accepted Answer

They contain only single covalent bonds, allowing the chains to pack closely together.

Question 18

Which of the following is a function of eicosanoids in the body?

Accepted Answer

They are involved in blood clotting, control of blood pressure, inflammation, and labor contractions.

Question 19

Which of the following statements about protein structure is correct?

Accepted Answer

Secondary structure involves repeating coils (alpha-helix) and folds (beta-pleated sheets) stabilized by hydrogen bonds.

Question 20

Which of the following best describes the role of nucleic acids in the body?

Accepted Answer

They store and transmit genetic information.

Chapter 2: Chemistry Comes Alive – Foundations for Anatomy & Physiology

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