Which of the following best describes the primary structure of an enzyme?
A
Folding of polypeptide chains
B
Sequence of amino acids
C
Arrangement of beta sheets
D
Multiple subunits interacting
Analysis & Theory
The primary structure refers to the specific sequence of amino acids in a polypeptide chain.
Which of the following bonds is responsible for the enzyme’s secondary structure?
Analysis & Theory
Hydrogen bonds between the backbone atoms stabilize alpha-helices and beta-sheets in the secondary structure.
What part of the enzyme is responsible for binding the substrate?
Analysis & Theory
The active site is the specific region of an enzyme that binds to the substrate.
The overall 3D structure of a single polypeptide enzyme is referred to as its:
Analysis & Theory
The tertiary structure is the full 3D shape of a single polypeptide chain.
Which level of enzyme structure involves interactions between multiple polypeptide chains?
Analysis & Theory
The quaternary structure refers to the assembly of multiple polypeptide chains into a functional enzyme complex.
Which of the following interactions help stabilize the tertiary structure of enzymes?
C
Hydrophobic interactions
Analysis & Theory
Tertiary structure is stabilized by hydrogen bonds, disulfide bridges, ionic bonds, and hydrophobic interactions.
What is the name of the model that explains how enzymes change shape to accommodate substrates?
Analysis & Theory
The Induced Fit model states that enzymes change shape slightly to fit the substrate better.
Which bond forms between amino acids to create the primary structure of an enzyme?
Analysis & Theory
Peptide bonds link amino acids into a polypeptide chain (primary structure).
Which structure level determines the function of the enzyme most directly?
Analysis & Theory
The tertiary structure shapes the active site, directly influencing enzyme function.
Enzymes that consist of multiple subunits exhibit which structural level?
Analysis & Theory
Quaternary structure describes how multiple polypeptides combine to form a functional enzyme.