Question 1

Which of the following best describes the primary building blocks (monomers) of proteins?

Accepted Answer

Amino acids

Question 2

A peptide bond forms between which two functional groups of adjacent amino acids?

Accepted Answer

Amino group and carboxyl group

Question 3

Which term is used for an amino acid chain that has greater than 50 covalently linked amino acids?

Accepted Answer

Polypeptide

Question 4

Proteins have a hierarchy of structure organized into how many levels?

Accepted Answer

$$4$$

Question 5

Which of the following is true of protein structure?

Accepted Answer

Secondary protein structures are caused by hydrogen bonding between atoms of the peptide backbone.

Question 6

What is the role of a chaperone protein?

Accepted Answer

Assist in protein refolding after denaturation.

Question 7

Which of the following changes in the environment can result in protein denaturation?

Accepted Answer

Change in pH

Question 8

A protein that has lost its functional shape due to environmental changes is called:

Accepted Answer

A denatured protein

Question 9

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

Accepted Answer

Primary structure

Question 10

Which component of an amino acid is unique to each type of amino acid?

Accepted Answer

R group

Question 11

If a protein is exposed to high temperature, what is most likely to happen?

Accepted Answer

It will denature and lose its functional shape.

Question 12

Which of the following best describes a polypeptide?

Accepted Answer

A chain of 2 to 50 covalently linked amino acids

Question 13

Which protein structure level involves the overall 3D shape of a polypeptide chain?

Accepted Answer

Tertiary

Question 14

Which of the following statements about peptide bonds is correct?

Accepted Answer

They are formed by dehydration synthesis between amino acids.

Question 15

A protein with multiple polypeptide chains exhibits which level of structure?

Accepted Answer

Quaternary

Question 16

Which of the following is NOT a component of an amino acid?

Accepted Answer

Phosphate group

Question 17

Which process is responsible for the formation of peptide bonds?

Accepted Answer

Dehydration synthesis

Question 18

Which of the following best explains why proteins can be denatured by changes in pH?

Accepted Answer

Changes in pH disrupt hydrogen bonds and ionic interactions that maintain protein structure.

Question 19

A scientist isolates a molecule with the following structure: a central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group. What type of molecule is this?

Accepted Answer

Amino acid

Question 20

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

Accepted Answer

The arrangement of multiple polypeptide chains into a single functional protein

Proteins and Amino Acids: Structure, Function, and Organization

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