26 Questions
Which level of protein structure is determined by the sequence of amino acids in the polypeptide chain?
Primary structure
Which type of fibrous protein is formed by the arrangement of protein chains into fibres?
Collagen
What is the primary structure of α-keratin characterized by?
Glycine-rich repeat
How do the β-sheets in fibroin interact with each other?
Van der Waals bonds
What is the most abundant vertebrate protein?
Collagen
Which amino acid is frequently found in the repeating tripeptide sequence of collagen?
Glycine
How do the polypeptide chains in collagen form inter-chain bonds?
Hydrogen bonds
Which type of bond is responsible for the formation of tertiary structure in proteins?
B C D
What is the function of disulphide bridges in proteins?
To stabilize the tertiary structure
How are alpha-helices usually represented in diagrammatic representations of tertiary structure?
As spirals or cylinders within the ribbon
What is the primary role of non-covalent bonds in tertiary structure formation?
To maintain the overall protein structure
Which level of protein structure is responsible for the association of secondary structures into compact domains?
Tertiary structure
What is the function of quaternary structure in proteins?
To form proteins from multiple polypeptide chains
What makes proteins more resistant to degradation and denaturation?
Disulphide bridges
What is the primary component shown in diagrammatic representations of tertiary structure?
Polypeptide backbone
Which type of bond is NOT involved in the formation of tertiary structure in proteins?
Disulphide bridges
Quaternary structure refers to the arrangement of protein chains into fibres.
False
Globular proteins are usually involved in structural roles within the cell.
False
The primary structure of a protein is determined by the position of disulphide cross-links.
False
Keratin is a fibrous protein that forms strong fibres in skin, bone, teeth, etc.
False
Collagen forms a triple helix structure, with every 4th amino acid passing through the center.
False
True or false: Tertiary structure refers to the association of secondary structures into compact domains.
True
True or false: covalent bonds, hydrogen bonds and van der Waals forces, play a crucial role in the correct formation of tertiary structure.
False
True or false: Disulphide bridges are covalent bonds that can form between the side chains of cysteine residues, making proteins more resistant to degradation and denaturation.
True
True or false: Diagrammatic representations of tertiary structure usually only show the polypeptide backbone, with alpha-helices represented as spirals or cylinders, and beta-strands represented as arrows.
True
True or false: Quaternary structure refers to proteins that are formed from more than one polypeptide chain.
True
Test your knowledge on the tertiary structure of proteins! This quiz will cover topics such as the formation of helices and beta sheets, the correct folding of protein domains, non-covalent bonding, and more. Challenge yourself and see how well you understand the intricate three-dimensional arrangement of proteins.
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