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 bonds

Question 3

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

Accepted Answer

$$4$$

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 have only single bonds between carbons; unsaturated have one or more double bonds

Question 10

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

Accepted Answer

It is a double-stranded polymer of nucleotides held together by hydrogen bonds between bases

Question 11

A patient is given a solution with a pH of 9. Which of the following best describes this solution?

Accepted Answer

It is basic and has a low concentration of H$$^+$$ ions

Question 12

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 13

Which of the following is an example of an exchange (replacement) reaction?

Accepted Answer

$$\mathrm{A} + \mathrm{BC} \rightarrow \mathrm{AB} + \mathrm{C}$$

Question 14

Which of the following statements about protein structure is correct?

Accepted Answer

Tertiary structure is the overall 3D shape of a single polypeptide

Question 15

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

Accepted Answer

It is the most important short-term energy storage molecule

Question 16

Which of the following is a property of acids?

Accepted Answer

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

Question 17

Which of the following is a function of salts in living cells?

Accepted Answer

They create electrical differences across membranes and help transfer electrons

Question 18

Which of the following best explains why denaturation of a protein leads to loss of function?

Accepted Answer

Denaturation disrupts the protein's 3D structure, preventing it from functioning properly

Question 19

Which of the following is a correct statement about hydrogen bonds?

Accepted Answer

They stabilize the 3D structure of large molecules like DNA

The Chemistry of Microbiology: Foundations for Life and Cellular Function

Guida di studio - Domande di pratica