Question 1

Which of the following statements best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the transfer of electrons from one atom to another, resulting in charged ions, while a covalent bond involves the sharing of electrons between atoms.

Question 2

A neutral atom of oxygen has an atomic number of 8 and an atomic mass of 16. How many protons, neutrons, and electrons does it have?

Accepted Answer

8 protons, 8 neutrons, 8 electrons

Question 3

Which of the following elements is NOT always present in organic compounds?

Accepted Answer

Sodium

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 polar covalent bond?

Accepted Answer

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

Question 6

Which of the following reactions is an example of an endothermic reaction in living organisms?

Accepted Answer

Dehydration synthesis of proteins from amino acids

Question 7

A solution has a pH of 4. Which of the following statements is true?

Accepted Answer

The solution is acidic and has a high concentration of H$$^+$$ ions.

Question 8

Which of the following best describes the role of enzymes in biological reactions?

Accepted Answer

Enzymes speed up chemical reactions by lowering the activation energy.

Question 9

Which of the following is a correct statement about the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids contain only single bonds between carbon atoms, while unsaturated fatty acids contain one or more double bonds.

Question 10

Which of the following best describes a buffer in a biological system?

Accepted Answer

A buffer is a substance that maintains pH by accepting or donating H$$^+$$ ions as needed.

Question 11

Which of the following macromolecules is correctly matched with its monomer?

Accepted Answer

Carbohydrates – Monosaccharides

Question 12

Which of the following is NOT a function of water in biological systems?

Accepted Answer

Provides structural support to cell walls

Question 13

A molecule with the formula C$$_6H$_{12}O$_6 is $$most likely a:

Accepted Answer

Monosaccharide

Question 14

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

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 15

Which of the following statements about ATP is correct?

Accepted Answer

ATP is a nucleotide that stores energy in its phosphate bonds.

Question 16

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophobic tails avoid water while their hydrophilic heads interact with water.

Question 17

Which of the following is an example of a decomposition reaction?

Accepted Answer

Hydrolysis of a disaccharide into two monosaccharides

Question 18

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 19

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds are weak attractions between a hydrogen atom and an electronegative atom like oxygen or nitrogen.

Question 20

Which of the following best describes the difference between anabolism and catabolism?

Accepted Answer

Anabolism builds complex molecules from simpler ones and requires energy input, while catabolism breaks down molecules and releases energy.

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

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