Question 1

Which of the following statements best describes an isotope?

Accepted Answer

An atom with the same number of protons and electrons, but a different number of neutrons.

Question 2

A molecule of water ($$\mathrm{H_2O}) is $$held together by which type of bond between the hydrogen and oxygen atoms?

Accepted Answer

Polar covalent bond

Question 3

Which elements are always present in organic compounds?

Accepted Answer

Carbon and hydrogen

Question 4

An atom with a total of 6 electrons will have how many electrons in its inner shell and how many in its valence shell?

Accepted Answer

2 in the inner shell, 4 in the valence shell

Question 5

Which of the following best describes a catabolic reaction in living organisms?

Accepted Answer

A decomposition reaction that releases energy

Question 6

What is the primary function of enzymes in biological systems?

Accepted Answer

To lower the activation energy of chemical reactions

Question 7

Which of the following is true about the pH scale?

Accepted Answer

A solution with $$\mathrm{pH} = 3 is $$more acidic than a solution with $$\mathrm{pH} = 7$$

Question 8

Which type of bond is responsible for the attraction between water molecules?

Accepted Answer

Hydrogen bond

Question 9

Which of the following macromolecules is primarily responsible for storing genetic information?

Accepted Answer

Nucleic acids

Question 10

Which functional group is characteristic of amino acids and is involved in peptide bond formation?

Accepted Answer

Amino group ($$\mathrm{-NH_2$})$$

Question 11

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are hydrophobic and include fats, phospholipids, steroids, and waxes

Question 12

A buffer solution is important in biological systems because it:

Accepted Answer

Maintains a stable pH by neutralizing acids and bases

Question 13

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water

Question 14

Which of the following is a correct comparison between inorganic and organic molecules?

Accepted Answer

Organic molecules contain carbon-hydrogen bonds, while inorganic molecules do not

Question 15

Which of the following is a polysaccharide?

Accepted Answer

Cellulose

Question 16

Which of the following best describes the role of ATP in cells?

Accepted Answer

ATP serves as the primary energy currency of the cell

Question 17

Which of the following statements about protein structure is correct?

Accepted Answer

The primary structure of a protein is its sequence of amino acids

Question 18

A chemical reaction in which a salt is formed from an acid and a base is called:

Accepted Answer

An exchange reaction

Question 19

Which of the following best explains why phospholipids are important in cell membranes?

Accepted Answer

They have hydrophilic heads and hydrophobic tails, allowing them to form bilayers

Question 20

A charged atom that has gained or lost electrons is called:

Accepted Answer

An ion

Chapter 2: The Chemistry of Microbiology – Basic Fundamentals of Chemistry

Study Guide - Practice Questions