2.1.2: Proteins Flashcards
What type of bonds are involved in maintaining protein structures?
Hydrophobic, hydrophilic, hydrogen, ionic, and disulphide bonds.
These bonds are crucial for the unique shapes of proteins.
What is quaternary structure in proteins?
A protein made up of more than one polypeptide chain, folded into a 3D shape.
This structure is maintained by various types of bonds.
What is haemoglobin made up of?
4 polypeptide chains.
Haemoglobin is a typical example of a protein with a quaternary structure.
What is a prosthetic group in proteins?
A non-amino acid group attached to a protein that contains iron.
It is important for the function of conjugated proteins.
What defines a conjugated protein?
A protein that has a prosthetic group attached to it.
This means a non-protein group is added.
What are fibrous proteins characterized by?
Long twisted strands, stable structure, insoluble in water, and strength for structural function.
Examples include collagen in bone and keratin in hair.
What are globular proteins characterized by?
Spherical shape, relatively unstable structure, soluble, and metabolic functions.
Examples include all enzymes, antibodies, and some hormones like insulin.
Fill in the blank: A protein that is made up of more than one polypeptide chain has a _______ structure.
[quaternary]
True or False: Globular proteins are generally soluble in water.
True
This characteristic differentiates them from fibrous proteins.
True or False: Collagen is an example of a globular protein.
False
Collagen is a fibrous protein.
What is the role of hydrogen bonds in protein structure?
They help maintain the 3D shape of proteins.
These bonds are essential for protein stability.
