Question 1

Which of the following best describes a compound?

Accepted Answer

A molecule containing two or more different elements

Question 2

In an atom, where are protons and neutrons located?

Accepted Answer

In the nucleus

Question 3

Which of the following statements about chemical bonds is correct?

Accepted Answer

Chemical bonds result from the interaction of electrons

Question 4

A solution is formed when sugar is dissolved in water. In this scenario, which is the solute?

Accepted Answer

Sugar

Question 5

Which of the following best describes the pH scale?

Accepted Answer

A scale ranging from 0 to 14, where 0-6 is acidic, 7 is neutral, and 8-14 is basic

Question 6

Which of the following is a monosaccharide?

Accepted Answer

Glucose

Question 7

If a solution has too many hydrogen ions ($$H^+$$), what is its pH likely to be?

Accepted Answer

Less than 7

Question 8

Which of the following is NOT a function of proteins in microbial cells?

Accepted Answer

Storing genetic information

Question 9

Which nitrogen base is found in RNA but NOT in DNA?

Accepted Answer

Uracil

Question 10

Which of the following statements about nucleotides is correct?

Accepted Answer

Nucleotides are held together by phosphodiester bonds

Question 11

A buffer is added to a solution to maintain its pH. Which equation best represents the neutralization reaction involving a buffer?

Accepted Answer

$$H^+ + OH^- \rightarrow H_2O$$

Question 12

Which of the following is a purine base found in nucleic acids?

Accepted Answer

Adenine

Question 13

Which of the following best describes the valence shell?

Accepted Answer

The outermost electron shell of an atom

Question 14

Which of the following is true about molecules and compounds?

Accepted Answer

All compounds are molecules, but not all molecules are compounds

Question 15

Which of the following is a real-life example of a solution?

Accepted Answer

Salt dissolved in water

Question 16

Which of the following is a micromolecule classified by the number of sugar units?

Accepted Answer

Saccharide

Question 17

Which of the following is a function of carbohydrates in microbial cells?

Accepted Answer

Forming cell wall structure

Question 18

Which of the following is a pyrimidine base found in DNA?

Accepted Answer

Thymine

Question 19

Which of the following best explains why most elements do not exist in pure form?

Accepted Answer

Atoms tend to form chemical bonds to fill their valence shells

Question 20

A scientist mixes a buffer into a solution to prevent drastic changes in pH. Which property of the buffer is most important in this scenario?

Accepted Answer

Ability to neutralize excess $$H^+$$ and $$OH^-$$ ions

Chemical Principles and Molecules of Microbiology

Study Guide - Practice Questions