Question 1

Which property of water allows it to act as a temperature buffer in living organisms?

Accepted Answer

Its high heat capacity due to hydrogen bonding between molecules

Question 2

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally, resulting in partial charges

Question 3

What is the correct formula for calculating pH?

Accepted Answer

$$pH = -\log[H^+]$$

Question 4

Which of the following is NOT a function of lipids in living organisms?

Accepted Answer

Genetic information storage

Question 5

A solution with a pH of 4 has how many times more hydrogen ions than a solution with a pH of 7?

Accepted Answer

1000 times more

Question 6

Which of the following statements about dehydration synthesis is correct?

Accepted Answer

It joins monomers to form polymers by removing water

Question 7

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

Accepted Answer

$$HCl \rightarrow H^+ + Cl^-$$

Question 8

Which macromolecule is primarily responsible for catalyzing biochemical reactions in cells?

Accepted Answer

Proteins

Question 9

Which of the following best describes the structure of DNA?

Accepted Answer

Double helix with deoxyribose sugar and phosphate backbone

Question 10

Which functional group is responsible for the acidic properties of organic acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 11

Which of the following is a polymer of glucose that is covalently bonded differently than starch?

Accepted Answer

Cellulose

Question 12

What is the main difference between saturated and unsaturated fats?

Accepted Answer

Unsaturated fats contain one or more double bonds in their fatty acids

Question 13

Which of the following is NOT a component of a nucleotide?

Accepted Answer

Fatty acid

Question 14

Which level of protein structure is characterized by the folding of the polypeptide chain into alpha helices and beta pleats?

Accepted Answer

Secondary structure

Question 15

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

Accepted Answer

Water's polarity allows it to surround and dissociate ions

Question 16

Which of the following is true about ATP?

Accepted Answer

ATP contains ribose, adenine, and three phosphate groups

Question 17

A bacterial cell is placed in a solution with a pH of 5. What effect might this have on the cell?

Accepted Answer

The cell may experience stress, as this pH is more acidic than optimal for most organisms

Question 18

Which of the following is a conjugated protein?

Accepted Answer

Glycoprotein

Question 19

Which of the following best describes the process of hydrolysis?

Accepted Answer

Breaking a polymer into monomers by adding a water molecule

Question 20

Which of the following is a property of water that is essential for life?

Accepted Answer

High cohesion due to hydrogen bonding

Chemical Principles in Microbiology: Structure and Function of Biological Molecules

Study Guide - Practice Questions