Question 1

Which of the following best describes the relationship between hydrolysis and condensation reactions in biological systems?

Accepted Answer

Condensation forms polymers by removing water, while hydrolysis breaks polymers by adding water.

Question 2

Which of the following is a correct pairing of a carbohydrate polymer and its monomer, along with the bond that links them?

Accepted Answer

Cellulose – glucose – glycosidic bond

Question 3

A scientist discovers a molecule composed of a glycerol backbone and three fatty acids. Which class of biological macromolecule does this molecule belong to, and what is the name of the bond that links its components?

Accepted Answer

Lipid; ester bond

Question 4

Which of the following amino acids would most likely be found in the interior of a globular protein, and why?

Accepted Answer

Leucine, because it is hydrophobic

Question 5

Which level of protein structure is directly determined by the sequence of amino acids in a polypeptide chain?

Accepted Answer

Primary structure

Question 6

A mutation causes a single amino acid substitution in the primary structure of hemoglobin. Which levels of protein structure could potentially be affected as a result?

Accepted Answer

All levels: primary, secondary, tertiary, and quaternary

Question 7

Which of the following statements about nucleic acids is correct?

Accepted Answer

DNA and RNA are polymers of nucleotides joined by phosphodiester bonds.

Question 8

In a DNA double helix, what does it mean that the two strands are 'antiparallel'?

Accepted Answer

One strand runs from the $5'$ to $3'$ direction, while the other runs from $3'$ to $5'$ direction.

Question 9

Which of the following best describes the role of ATP in the cell?

Accepted Answer

ATP acts as the primary energy currency, providing energy for cellular processes.

Question 10

Which of the following is a correct match between a molecule and its function?

Accepted Answer

cAMP – intracellular signaling molecule

Question 11

A researcher is analyzing a sample and finds a polymer with the following characteristics: it contains nitrogenous bases, a five-carbon sugar, and phosphate groups. Which type of macromolecule is this, and what is the name of the bond linking its monomers?

Accepted Answer

Nucleic acid; phosphodiester bond

Question 12

Which of the following best explains why cellulose is difficult for most animals to digest?

Accepted Answer

Cellulose contains $\beta$-1,4 glycosidic bonds, which most animals lack enzymes to break.

Question 13

Which of the following statements about phospholipids is correct?

Accepted Answer

Phospholipids are amphipathic, containing both hydrophobic and hydrophilic regions.

Question 14

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds.

Question 15

A protein is exposed to high heat and loses its three-dimensional structure, but its primary structure remains intact. What process has occurred?

Accepted Answer

Denaturation

Question 16

Which of the following best describes the role of NAD+ in cellular metabolism?

Accepted Answer

NAD+ acts as an electron carrier, being oxidized or reduced in metabolic reactions.

Question 17

Which of the following statements about the $5'$ and $3'$ ends of a nucleic acid strand is correct?

Accepted Answer

The $5'$ end has a phosphate group attached to the fifth carbon of the sugar, while the $3'$ end has a hydroxyl group on the third carbon.

Question 18

Which of the following is a correct example of a disaccharide and its component monosaccharides?

Accepted Answer

Sucrose: glucose + fructose

Question 19

Which of the following best explains why enzymes are considered proteins?

Accepted Answer

Enzymes are polypeptides that catalyze chemical reactions, and their function depends on their three-dimensional structure.

Chapter 5 Notes

Study Guide - Practice Questions

Study Guide - Flashcards