Exp 2.1: Proteins, Structure Levels, Classifications Flashcards
most abundant biomolecule in all cells and all parts of a cell
proteins
proteins are biopolymers of?
amino acids
2 ways an amino acid links to another
- peptide bond
- condensation
Identify the level of protein structure:
sequence of amino acid residues
primary structure
Identify the level of protein structure:
regular, repeating folding patterns (H-bonding)
secondary structure
Identify the level of protein structure:
α-helix and β-pleated sheets
secondary structure
Identify the structure:
rod-like structure
N-H to C=O
H-bonds parallel to axis
typically amphiphilic
α-helix
Identify the structure:
polypeptide chains: side-by-side
H-bonds between chains
parallel or antiparallel
more stable
β-pleated sheets
Identify the level of protein structure:
overall folding of domains;
folding of protein segments in 3D
tertiary structure
Identify the level of protein structure:
interaction between different polypeptide chains to produce an oligomeric structure
quaternary structure
2 classifications of proteins according to composition
- simple proteins
- conjugated proteins
Identify the type of protein according to composition:
yield only amino acids upon hydrolysis;
primary structure only
simple proteins
Identify the type of protein according to composition:
simple proteins + non-protein substances
conjugated proteins
2 classifications of proteins according to shape
- globular proteins
- fibrous proteins
Identify the type of protein according to shape:
polypeptide chain/s folded into spherical shape
globular proteins
