Question 1

Which property of carbon allows it to form a wide variety of complex organic molecules?

Accepted Answer

Its ability to form four covalent bonds with other atoms

Question 2

Which functional group is responsible for the acidic properties of amino acids and is commonly found in organic acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 3

A molecule with the formula $$C_6H_{12}O_6$ can exist as two different compounds with the same formula but different structures. What is the term for these compounds?

Accepted Answer

Isomers

Question 4

Which type of isomerism is illustrated by glucose and galactose, which differ in the arrangement of atoms around one asymmetric carbon?

Accepted Answer

Mirror-image isomerism

Question 5

Which reaction is responsible for joining monomers together to form polymers, such as in the synthesis of proteins from amino acids?

Accepted Answer

Dehydration reaction (condensation)

Question 6

A protein loses its functional shape when exposed to high temperature or extreme pH. What is this process called?

Accepted Answer

Denaturation

Question 7

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

Accepted Answer

The specific linear sequence of amino acids

Question 8

Which functional group is found in ATP and is crucial for energy transfer in cells?

Accepted Answer

Phosphate group ($$-PO_4$^{3-})$$

Question 9

A scientist discovers a molecule with a long hydrocarbon chain and a carboxyl group at one end. Which class of biological molecule does this most likely belong to?

Accepted Answer

Fatty acid

Question 10

Which bond is formed between two cysteine side chains and helps stabilize the tertiary structure of proteins?

Accepted Answer

Disulfide bridge

Question 11

Which of the following is a polymer made of many monosaccharide units?

Accepted Answer

Polysaccharide

Question 12

Which process breaks down polymers into monomers by adding water?

Accepted Answer

Hydrolysis

Question 13

Which of the following best explains why phospholipids are essential for cell membrane structure?

Accepted Answer

They have both hydrophilic heads and hydrophobic tails, allowing formation of bilayers

Question 14

A patient is diagnosed with a genetic disorder that affects the folding of proteins, resulting in nonfunctional enzymes. Which cellular component is most likely malfunctioning?

Accepted Answer

Chaperonin

Question 15

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 16

Which of the following statements about enantiomers is correct?

Accepted Answer

They are mirror-image isomers that differ in handedness

Question 17

Which level of protein structure is directly affected by mutations that change the amino acid sequence?

Accepted Answer

Primary structure

Question 18

Which functional group is found in alcohols and makes molecules more soluble in water?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 19

Which of the following best describes a dehydration reaction?

Accepted Answer

A reaction that joins monomers by releasing a water molecule

Question 20

A researcher is studying a molecule that contains a carbonyl group at the end of its carbon skeleton. Which type of molecule is this most likely?

Accepted Answer

Aldehyde

Carbon and the Molecular Diversity of Life & The Structure and Function of Large Biological Molecules

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