Question 1

Which process is responsible for assembling polymers from monomers in biological systems, and what is the chemical change involved?

Accepted Answer

Dehydration (condensation) synthesis; removal of a water molecule to form a bond

Question 2

A patient is diagnosed with a genetic disorder that affects the formation of peptide bonds. Which macromolecule's synthesis is most directly impaired?

Accepted Answer

Proteins

Question 3

Which of the following best describes the difference between an aldose and a ketose monosaccharide?

Accepted Answer

Aldoses have a carbonyl group at the end of the carbon chain, while ketoses have it in the middle.

Question 4

Which equation represents the general chemical formula for a monosaccharide?

Accepted Answer

$$C_nH_{2n}O_n$$

Question 5

Starch and glycogen are both storage polysaccharides. Which structural feature distinguishes them?

Accepted Answer

Starch is composed of glucose monomers with mostly alpha-1,4 linkages, while glycogen has more alpha-1,6 branches.

Question 6

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

Accepted Answer

Catalyzing chemical reactions

Question 7

A triglyceride is formed by the combination of which components?

Accepted Answer

Three fatty acids and one glycerol

Question 8

Which type of bond is formed between two amino acids during protein synthesis?

Accepted Answer

Peptide bond

Question 9

Which level of protein structure is primarily determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 10

What type of interaction is responsible for stabilizing the secondary structure of proteins, such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 11

A protein loses its functional shape when exposed to high temperature or extreme pH. This process is called:

Accepted Answer

Denaturation

Question 12

Which of the following is a correct description of a nucleotide found in nucleic acids?

Accepted Answer

A phosphate group, a pentose sugar, and a nitrogenous base

Question 13

Which type of linkage connects nucleotides in a nucleic acid polymer?

Accepted Answer

Phosphodiester linkage

Question 14

Which nitrogenous base is found in RNA but not in DNA?

Accepted Answer

Uracil

Question 15

Which of the following best explains why lipids are hydrophobic?

Accepted Answer

They contain long hydrocarbon chains that are nonpolar.

Question 16

Which of the following is a structural polysaccharide found in plant cell walls?

Accepted Answer

Cellulose

Question 17

A mutation causes a protein to lose its disulfide bridges. Which level of protein structure is most directly affected?

Accepted Answer

Tertiary structure

Question 18

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 19

Which of the following is a real-world consequence of the amphipathic nature of phospholipids?

Accepted Answer

Formation of cell membranes with hydrophilic surfaces and hydrophobic interiors

Question 20

During the breakdown of a polysaccharide, which chemical reaction occurs and what is the net result?

Accepted Answer

Hydrolysis; water is added to break glycosidic bonds and release monomers

Carbon and Molecular Diversity: Structure and Function of Macromolecules

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