Question 1

Which of the following best describes an isotope?

Accepted Answer

An atom of the same element with a different number of neutrons

Question 2

Which type of chemical bond is primarily responsible for the unique properties of water, such as surface tension and cohesion?

Accepted Answer

Hydrogen bond

Question 3

A solution has a hydrogen ion concentration of $$1 	imes 10$$^{-4}$$ M. What is its pH?

Accepted Answer

$$pH = 4$$

Question 4

Which of the following reactions is an example of dehydration synthesis?

Accepted Answer

Linking two amino acids to form a dipeptide and releasing water

Question 5

Which of the following statements about phospholipids is correct?

Accepted Answer

They are the main component of cell membranes due to their amphipathic nature

Question 6

What is the main function of buffers in biological systems?

Accepted Answer

To prevent drastic changes in pH by absorbing excess H$$^+ or OH$^-$$ ions

Question 7

Which of the following best explains why antacids can increase the risk of Vibrio infection from raw oysters?

Accepted Answer

Antacids neutralize stomach acid, raising pH and allowing more bacteria to survive

Question 8

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Carbohydrate – Monosaccharide

Question 9

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids contain only single bonds between carbons, while unsaturated fatty acids contain one or more double bonds

Question 10

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

Accepted Answer

It consists of two antiparallel strands held together by hydrogen bonds between nitrogenous bases

Question 11

A patient is given a solution with a pH of 2. What is the concentration of hydrogen ions in this solution?

Accepted Answer

$$1 	imes 10$$^{-2}$$ M

Question 12

Which of the following best describes an exchange reaction?

Accepted Answer

A reaction in which atoms or groups of atoms are transferred between molecules

Question 13

Which of the following is a function of proteins in living organisms?

Accepted Answer

Acting as enzymes to speed up chemical reactions

Question 14

Which of the following statements about ATP is correct?

Accepted Answer

ATP is composed of adenine, ribose, and three phosphate groups

Question 15

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

Accepted Answer

Water molecules are polar and surround ions, separating them from each other

Question 16

Which of the following is a property of acids?

Accepted Answer

They dissociate to release hydrogen ions (H$$^+) in $$solution

Question 17

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 18

Which of the following is a real-life consequence of denaturation of proteins?

Accepted Answer

Proteins lose their functional shape and cannot perform their biological roles

Question 19

Which of the following is a correct statement about the role of salts in cells?

Accepted Answer

Salts dissociate in water to form electrolytes, which help create electrical differences across membranes

The Chemistry of Microbiology: Foundations for Life and Cellular Function

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