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Food Chemistry
Exam IV
12
Science
Graduate
10/26/2010

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Cards

Term
Name some protein foods
Definition
formulated muscle foods, food gels (Jell-O), extruded veggie protein products (beans), & dairy (milk, cheese, ice cream)
Term
In what foods does protein effect texture?
Definition
egg white foam, cheese, bread
Term
Differentiate proteins by their solubility
Definition
Albumin - water
Glubulin - salt solution
Glutelin - acid/base solution
Prolamine - aqueous ethanol
Term
What is the prominent form of AA in nature?
Definition
L form (NH2 on the left)
Term
What is a zwitterion?
Definition
how most AA exist in an aqueous environment; (+) on amide end & (-) on carbozyl end; dipolar
Term
How do AA's exist in acidic/neutral/basic solutions?
Definition
Nonpolar AA are less soluble in water than polar AA; hydrophobic are found near protein core
Term
Define PK value for an amino acid
Definition
the pH where 50% of molecules are ionized
Term
What are the PK values of the Carboxyl group/amino group on amino acids?
Definition
carboxyl grp: pH=2-3
amino grp: pH=9-10
Term
Name the charged/polar AA's
Definition
Aspartic acid, glutamic acid, lysine, aginine, histidine
Term
Name the uncharged/polar AA's
Definition
asparagine, glutamine, cysteine, glycine, serine threonine, tyrosine
Term
Name the Hyrdophobic AA's
Definition
alanine, valine, leucine, isoleucine, methionine, Phenylalanine, proline, tryptophan
Term
What is a peptide bond?
Definition
covalently linked individual AA's; forms a peptide chain
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