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Test 3B
Test 3B
23
Chemistry
Undergraduate 1
11/13/2008

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Cards

Term
What is an Alditol?
Definition
Carbonyl group is reduced to a hydroxyl group by a reducing agent
Term
How does an Alpha amino acid exist in solution?
Definition
Zwitterion
Term
List BASIC amino acids.
Definition
Arginine
Histidine
Lysine
Term
List Acidic Amino Acids.
Definition
Aspartic Acid
Glutamic Acid
Term
What is distinctive about a peptide bond?
Definition
Carbon double bond to oxygen
conntcted to Nitrogen bonded to hydrogen
Term
When can Chymotrypsin cleave a protein chain?
Definition
After PHEnylanaline
After TRYptophan
After TYRosine
Term
Where does Trypsin cleave protein chains?
Definition
After ARGinine
After LYSine
EXCEPT wehre followed by PROlein
Term
List 4 means of stabiliztion for a TERTIARY protein.
Definition
Covalent bonds: S-S disulfide bonds
Hydrogen bonding
Salt bridge NH3+ C-O-
Hydorphobic between non-polar side chains
Term
Describe a Fibrous protein.
Definition
Linear
Insoluble in water
Folds so hydrophobic side chains are on the exterior
Example is Keratin
Term
Describe a Globular Protein.
Definition
Spherical
soluble in water-colloid
Hydrophilic side chains ar directed to exterior
Example: Albumin
Term
Describe secondary structure protein
Definition
Hydrogen bonding between amide linkages of main chain
alpha helix-spiral clockwise coil held by H bonding between carbonyl of amide and N-H of other
Side chain point outward
Beta pleated sheets
Random coil
Term
Can a secondary protein structure have Beta pleated sheets, alpha helix, and random coils?
Definition
YES
Term
Name 2 teritary structure proteins
Definition
Keratin-fibrous
Albumin-Globular
Term
Describe Quaternary Structure
Definition
2 or more polypeptide chains
Chains are SUBUNITS-identical or different
Conjugated proteins-material other than amino chaines
Term
What structure are Glycoproteins?
Definition
Quaternary sugars
Term
What structure are lipoproteins and hemoglobin?
Definition
Quaternary
Term
What is a conjugated protein?
Definition
Protein with a small organic molecule-Quatenary
Term
What is the small organic molecule of a conjugated protein called?
Definition
Prosthetic group
Term
Vasopressin and Oxytocin are examples of which structure of proteins?
Definition
Primary
Term
How many combinations are possible in a chain of "n" amino acids?
Definition
20 raised to the power of "n"
Term
Name amino acids with a phenyl ring.
Definition
Phenylalanine
Tyrosine
Term
Which amino acid contains a thiol?
Definition
Cystein can form disulfide bonds
Term
List some ways to denature a protein
Definition
Heat
6M aqueous Urea
Detergent
Reducing agent-mercaptoethanol
Heavy metal ions Pb, Hg, Cd
alcohols 70% ethanol
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