Question 1

Which of the following statements best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water molecules are polar, allowing them to surround and separate ions and polar molecules.

Question 2

A scientist is studying a molecule that contains carbon, hydrogen, and oxygen in a 1:2:1 ratio. Which class of macromolecule does this molecule most likely belong to?

Accepted Answer

Carbohydrate

Question 3

Which of the following best describes the difference between a polar covalent bond and a nonpolar covalent bond?

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons due to differences in electronegativity, while nonpolar covalent bonds involve equal sharing.

Question 4

Which of the following elements makes up the largest percentage of living matter by dry weight?

Accepted Answer

Oxygen (O)

Question 5

A solution has a pH of 5. How does its hydrogen ion concentration $$[H^+]$$ compare to a solution with a pH of 7?

Accepted Answer

$$[H^+] is 100 $$times higher

Question 6

Which of the following best describes the role of dehydration synthesis in the formation of macromolecules?

Accepted Answer

It forms larger molecules from smaller subunits by removing a water molecule.

Question 7

Which of the following functional groups is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group $$(-COOH)$$

Question 8

A patient is diagnosed with a bacterial infection caused by Mycobacterium tuberculosis. Which property of the bacterial cell wall is most relevant to its resistance to many antibiotics?

Accepted Answer

The presence of waxes in the cell wall making it impermeable to many substances

Question 9

Which of the following best explains why phospholipids are essential components of cell membranes?

Accepted Answer

They have both hydrophilic and hydrophobic regions, allowing them to form bilayers in aqueous environments.

Question 10

Which of the following statements about hydrogen bonds is correct?

Accepted Answer

Hydrogen bonds are weak attractions between a partially positive hydrogen and a partially or fully negative atom.

Question 11

A researcher is analyzing a sample and finds a molecule with a backbone of N-C-C repeating units. This molecule is most likely a:

Accepted Answer

Protein

Question 12

Which of the following best describes the relationship between catabolism and anabolism in metabolism?

Accepted Answer

Catabolism breaks down molecules to release energy, while anabolism assembles large molecules using energy.

Question 13

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

Accepted Answer

Nucleic acid – Nucleotide

Question 14

Which of the following best explains why carbon is considered the backbone of organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for a diversity of stable structures.

Question 15

A DNA molecule is described as 'antiparallel.' What does this mean?

Accepted Answer

The two strands run in opposite directions: one 5' to 3', the other 3' to 5'.

Question 16

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

Accepted Answer

They are involved in cell recognition and signaling.

Question 17

Which of the following is a property of water that is critical for life and is a result of hydrogen bonding?

Accepted Answer

Remains liquid across a wide range of temperatures

Question 18

Which of the following best explains why most biological molecules are based on carbon?

Accepted Answer

Carbon atoms can form four stable covalent bonds, allowing for complex and diverse molecules.

Question 19

A molecule contains a phosphate group, a pentose sugar, and a nitrogenous base. This molecule is a:

Accepted Answer

Nucleotide

Question 20

Which of the following best describes the function of steroids in eukaryotic cells?

Accepted Answer

They strengthen cell membranes by fitting between phospholipids.

Chemistry of Microbiology: Atomic Structure, Elements, and Chemical Bonds

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