Question 1

Which of the following best describes the relationship between monomers and polymers in biological macromolecules?

Accepted Answer

Monomers are small molecules that join together to form polymers through covalent bonds.

Question 2

Which of the following is NOT considered a polymer or macromolecule?

Accepted Answer

Lipid (phospholipid)

Question 3

Proteins are responsible for a wide range of functions in living organisms. Which of the following is NOT a function of proteins?

Accepted Answer

Storing genetic information

Question 4

Collagen is the most abundant protein in animals. Which of the following statements about collagen is correct?

Accepted Answer

Collagen provides elasticity and structural support to connective tissues.

Question 5

Which of the following best explains why proteins can perform such a wide variety of functions in cells?

Accepted Answer

Proteins have a diversity of structures due to the variety of amino acid sequences and side chains.

Question 6

A protein's function is determined primarily by its three-dimensional shape. Which level of protein structure is directly responsible for this shape?

Accepted Answer

Tertiary structure

Question 7

Which type of bond is primarily responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 8

Which of the following is an example of a protein with quaternary structure?

Accepted Answer

Collagen, which consists of three polypeptide chains twisted together

Question 9

A mutation changes a single amino acid in the primary structure of a protein. Which of the following is the most likely consequence?

Accepted Answer

The protein's tertiary structure and function may be altered.

Question 10

Which of the following best describes the difference between an alpha-helix and a beta-pleated sheet in protein structure?

Accepted Answer

Both are types of secondary structure stabilized by hydrogen bonds, but alpha-helices are coiled while beta-pleated sheets are folded back and forth.

Question 11

Which of the following is the correct sequence of events in the formation of a protein from amino acids?

Accepted Answer

Amino acids are linked by peptide bonds to form a polypeptide, which then folds into secondary, tertiary, and possibly quaternary structures.

Question 12

Which of the following best explains why collagen becomes less effective as we age, leading to wrinkles and joint problems?

Accepted Answer

Collagen production decreases and its structure becomes less organized, reducing elasticity and support.

Question 13

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

Accepted Answer

Defensive protein – Antibodies that inactivate and destroy viruses and bacteria

Question 14

Which of the following statements about peptide bonds is correct?

Accepted Answer

A peptide bond forms between the amino group of one amino acid and the carboxyl group of another.

Question 15

A protein is found to have a unique sequence of amino acids, a regular pattern of alpha-helices, and is composed of two polypeptide chains. Which levels of protein structure are present?

Accepted Answer

Primary, secondary, and quaternary

Question 16

Which of the following best describes the role of R groups (side chains) in amino acids?

Accepted Answer

R groups determine the chemical properties and interactions of each amino acid, influencing protein folding and function.

Question 17

Which of the following equations correctly represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + \mathrm{H}_2\mathrm{O}$$

Question 18

Which of the following best explains why hemoglobin is considered a transport protein?

Accepted Answer

Hemoglobin binds and carries oxygen from the lungs to other tissues in the body.

Question 19

Which of the following statements about the four major classes of biological molecules is correct?

Accepted Answer

Carbohydrates, proteins, and nucleic acids are polymers, while lipids are not polymers.

Structures and Functions of the Four Major Classes of Biological Molecules

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