Question 1

Which of the following best describes the role of electrons in chemical bonding?

Accepted Answer

Electrons are shared or transferred between atoms to form chemical bonds, determining the stability and reactivity of molecules.

Question 2

A sodium atom ($\mathrm{Na}$) loses one electron to become a sodium ion ($\mathrm{Na^+}$). What type of bond does it typically form with a chlorine ion ($\mathrm{Cl^-}$)?

Accepted Answer

Ionic bond

Question 3

Which statement about polar covalent bonds is correct?

Accepted Answer

Electrons are shared unequally between atoms with significantly different electronegativities, resulting in partial charges.

Question 4

Which of the following is a correct example of a reduction reaction in biological systems?

Accepted Answer

A molecule gains electrons, often accompanied by gaining hydrogen atoms.

Question 5

Which functional group is commonly found in amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($\mathrm{-COOH}$)

Question 6

A patient is diagnosed with a disorder affecting the lipid bilayer of their cell membranes. Which molecule is most directly involved in forming this bilayer?

Accepted Answer

Phospholipids

Question 7

Which of the following best explains why water is a good solvent for polar molecules?

Accepted Answer

Water molecules have partial charges due to polar covalent bonds, allowing them to interact with other charged or polar molecules.

Question 8

Which of the following is a polysaccharide found in the cell walls of plants and is important for structural support?

Accepted Answer

Cellulose

Question 9

Gram-positive and Gram-negative bacteria differ in their cell wall structure. Which feature is unique to Gram-negative bacteria?

Accepted Answer

Outer membrane containing lipopolysaccharides

Question 10

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

Accepted Answer

The sequence of amino acids linked by peptide bonds

Question 11

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

Accepted Answer

Fatty acid chain

Question 12

In DNA, which base pairs with guanine ($\mathrm{G}$)?

Accepted Answer

Cytosine ($\mathrm{C}$)

Question 13

Which of the following best describes a dehydration synthesis reaction?

Accepted Answer

A reaction in which two monomers are joined together by removing a molecule of water.

Question 14

Which property of carbon makes it ideal for forming the backbone of macromolecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for complex and diverse molecular structures.

Question 15

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

Accepted Answer

Hydrogen bonds are weak electrical attractions between partial charges on molecules, such as between water molecules.

Question 16

Which of the following is a function of proteins in cells?

Accepted Answer

Catalyzing chemical reactions, structural support, and defense against pathogens

Question 17

Which molecule is the main source of immediate energy for cellular processes?

Accepted Answer

Glucose

Question 18

Which of the following best explains the difference between saturated and unsaturated fats?

Accepted Answer

Unsaturated fats contain one or more double bonds between carbon atoms, causing kinks in the fatty acid chain.

Question 19

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

Accepted Answer

DNA consists of two antiparallel strands held together by hydrogen bonds between complementary bases.

Atoms, Bonds, and Biological Molecules: Foundations for Microbiology

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