Question 1

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from one atom to another, resulting in oppositely charged ions.

Question 2

A sodium atom ($$\mathrm{Na}) $$loses one electron to become a sodium ion ($$\mathrm{Na^+}). $$What type of ion is this and what is its charge?

Accepted Answer

A cation with a positive charge.

Question 3

Which of the following is a property of water that makes life possible?

Accepted Answer

Water exhibits hydrogen bonding, leading to high surface tension and excellent solvent properties.

Question 4

Which chemical reaction is responsible for joining two amino acids together to form a peptide bond?

Accepted Answer

Dehydration synthesis reaction

Question 5

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

Accepted Answer

The solution is acidic and has a high concentration of hydrogen ions ($$[\mathrm{H}^+]).$$

Question 6

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

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and speeding up reactions without being consumed.

Question 7

Which of the following is a correct formula for a carbohydrate monomer?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 8

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 9

Which of the following is an example of a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 10

A triglyceride molecule is composed of which two main components?

Accepted Answer

Three fatty acids and one glycerol

Question 11

Which of the following best describes the difference between a phospholipid and a triglyceride?

Accepted Answer

A phospholipid has a phosphate group and two fatty acid tails, while a triglyceride has three fatty acid tails and no phosphate group.

Question 12

Which level of protein structure is characterized by alpha helices and beta sheets?

Accepted Answer

Secondary structure

Question 13

Which of the following is a function of proteins in the human body?

Accepted Answer

Catalyzing chemical reactions as enzymes

Question 14

Which of the following is a correct pairing of nucleic acid bases in DNA?

Accepted Answer

Adenine (A) pairs with Thymine (T)

Question 15

Which molecule is the primary energy carrier in cells?

Accepted Answer

Adenosine triphosphate ($$\mathrm{ATP})$$

Question 16

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

Accepted Answer

A buffer resists changes in pH by neutralizing excess acids or bases.

Question 17

Which of the following is true about the structure of DNA?

Accepted Answer

DNA is a double-stranded helix with deoxyribose sugar and thymine as a base.

Question 18

Which of the following best explains why water is an effective solvent for ionic compounds?

Accepted Answer

Water molecules surround ions due to their polarity, separating and dissolving them.

Question 19

Which of the following is a correct description of a reversible chemical reaction in the body?

Accepted Answer

A reaction where the rates of the forward and reverse reactions are balanced, resulting in equilibrium.

Question 20

Which of the following is a correct statement about the relationship between $$[\mathrm{H}^+]$$ concentration and pH?

Accepted Answer

As $$[\mathrm{H}^+]$$ increases, pH decreases.

Introduction to the Chemical Level of Organization: Foundations for Anatomy & Physiology

Study Guide - Practice Questions