Question 1

Which process is responsible for joining monomers to form biological polymers, and what is the chemical change involved?

Accepted Answer

Dehydration synthesis; removal of water to form bonds

Question 2

Cellulose is a polysaccharide found in plant cell walls. Why can't humans digest cellulose?

Accepted Answer

Humans lack the enzyme needed to break $$\beta(1 \rightarrow 4)$$ glycosidic bonds in cellulose.

Question 3

Which of the following best describes the structure of a phospholipid and its role in biological membranes?

Accepted Answer

Phospholipids have hydrophilic heads and hydrophobic tails, forming bilayers in cell membranes.

Question 4

Which level of protein structure is primarily stabilized by hydrogen bonds between backbone atoms?

Accepted Answer

Secondary structure

Question 5

A patient is diagnosed with Alzheimer's disease, which is associated with protein aggregation. Which process is most directly disrupted in this condition?

Accepted Answer

Proper protein folding assisted by chaperone proteins

Question 6

Which of the following statements about enzyme-catalyzed reactions is correct?

Accepted Answer

Enzymes lower the activation energy but do not change the overall free energy change $$\Delta G of a $$reaction.

Question 7

Which of the following is a correct example of a coupled reaction in cellular metabolism?

Accepted Answer

ATP hydrolysis drives active transport by providing energy for non-spontaneous processes.

Question 8

Which of the following best explains why glycogen is a more readily mobilized energy source than cellulose in animals?

Accepted Answer

Glycogen contains $$\alpha(1 \rightarrow 4)$$ and $$\alpha(1 \rightarrow 6)$$ glycosidic bonds, which are easily broken by animal enzymes.

Question 9

A scientist is studying the effect of temperature on enzyme activity. What is most likely to happen if the enzyme is exposed to very high temperatures?

Accepted Answer

The enzyme will denature, losing its tertiary and secondary structure due to disruption of hydrogen bonds and other interactions.

Question 10

Which of the following statements about spontaneous and non-spontaneous reactions is correct?

Accepted Answer

Spontaneous reactions have $$\Delta G \u003c 0$$ and can occur without energy input.

Question 11

Which of the following best describes the role of the active site in an enzyme?

Accepted Answer

It is the region where substrate binds and the reaction occurs.

Question 12

A mutation causes a protein to lose its disulfide bonds. Which level(s) of protein structure would be most affected?

Accepted Answer

Tertiary and quaternary structure

Question 13

Which of the following is NOT a force that contributes to protein conformation?

Accepted Answer

Glycosidic bonds

Question 14

Which of the following best explains the difference between amylose and amylopectin?

Accepted Answer

Amylose is unbranched, while amylopectin is branched due to $$\alpha(1 \rightarrow 6)$$ linkages.

Question 15

Which of the following is a correct statement about dehydration synthesis and hydrolysis?

Accepted Answer

Dehydration synthesis removes water to join monomers; hydrolysis adds water to break polymers.

Question 16

A researcher observes that a certain reaction in a cell only occurs when ATP is hydrolyzed. What does this indicate about the reaction?

Accepted Answer

The reaction is non-spontaneous ($$\Delta G \u003e 0) $$and requires coupling to ATP hydrolysis for energy.

Question 17

Which of the following is a function of cholesterol in biological membranes?

Accepted Answer

Stabilizes membrane fluidity and serves as a precursor for steroid hormones.

Question 18

Which of the following best describes the process of protein polymerization?

Accepted Answer

Amino acids are joined by peptide bonds through dehydration synthesis.

Question 19

Which of the following is a correct statement about the structure and function of lipids?

Accepted Answer

Lipids are hydrophobic molecules that serve as energy storage and structural components of membranes.

Polymers, Monomers, and Biological Macromolecules: Structure and Function

Study Guide - Practice Questions

Study Guide - Flashcards