Portage Learning Chem 210
Biochem Final Exam 2023/2024
Why are proteins the most important macromolecule?
They perform most of the work in cells.
How many different proteins are found in humans?
At least 20,000 different proteins
What are some functions of proteins?
Transport
Hormones
Catalysis
Structure
Protection
, Transport
Proteins help to move molecules around the cell and organism.
i.e. hemoglobin - blood based protein that carries oxygen from the lungs to the tissues
True or False: About 30% of amino acids are found in turns
True
these turns are changes in the direction of the N and C terminals of the primary sequence
these turns permit proteins to form secondary structures immediately next to one another
secondary structure - beta turn
a four-residue unit that turns 180 degrees
the turn is seen as a "rope" connecting the two strands
beta-turns can form with both the alpha helix and beta sheet
motif
collection of particularly stable groups of secondary structures
occupy a position b/w secondary and tertiary structures but are not one of the four levels specified by
scientists
i.e. helix-turn-helix composed of an Alpha helix, followed by a turn, and then another alpha helix
Tertiary structure
the overall 3D structure of the folded polypeptide
non-covalent forces and disulfide bonds maintain tertiary structure in the proper conformation
necessary for function
i.e. myoglobin depicted is critical for our muscle cells for binding and storing O2
Biochem Final Exam 2023/2024
Why are proteins the most important macromolecule?
They perform most of the work in cells.
How many different proteins are found in humans?
At least 20,000 different proteins
What are some functions of proteins?
Transport
Hormones
Catalysis
Structure
Protection
, Transport
Proteins help to move molecules around the cell and organism.
i.e. hemoglobin - blood based protein that carries oxygen from the lungs to the tissues
True or False: About 30% of amino acids are found in turns
True
these turns are changes in the direction of the N and C terminals of the primary sequence
these turns permit proteins to form secondary structures immediately next to one another
secondary structure - beta turn
a four-residue unit that turns 180 degrees
the turn is seen as a "rope" connecting the two strands
beta-turns can form with both the alpha helix and beta sheet
motif
collection of particularly stable groups of secondary structures
occupy a position b/w secondary and tertiary structures but are not one of the four levels specified by
scientists
i.e. helix-turn-helix composed of an Alpha helix, followed by a turn, and then another alpha helix
Tertiary structure
the overall 3D structure of the folded polypeptide
non-covalent forces and disulfide bonds maintain tertiary structure in the proper conformation
necessary for function
i.e. myoglobin depicted is critical for our muscle cells for binding and storing O2
