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FN 235 ch 6
Proteins
11
Nutrition
Undergraduate 3
02/10/2014

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Term
Primary Structure
Definition
sequence of amino acids in a protein, determined by inherited genetic information. Is like the order of letters in a word
Term
Secondary Structure
Definition
coil called alpha helix & folded structure called beta pleated sheet
Term
Tertiary Structure
Definition
Its the overall 3 dimensional shape. Determined by interaction between K grp, rather than interaction between back bone
Disulfide bridge(strong coval bond) reinforce proteins
has H+ bonds, ionic, hydrophobic interaction & van der Waals
Term
Quaternary Structure
Definition
2 or more polypeptide chains form 1 macromolecule
Term
Function of Proteins
Definition
structural and mechanical, enzymes, hormones, immune fxn, fluid balance, acid base balance
Term
Pepsin & HCl
Definition
Pepsin: digests proteins, Activated by HCl
HCl: unfolds protein, denatures protein
Term
Deamination
Definition
Removing Nitrogen group(amino group). It's converted to urea in the liver & passed thru blood stream for excretion in urine
Term
Complete vs. Incomplete Protein
Definition
Complete: animal, soy, supplies all essential amino acids
Incomplete: mostly plant, low in 1 or more essential amino acids
Term
Vegans & Vitamin Supplements
Definition
vegan diet is low on zinc, vitamin D, Ca, and vitamin B12. They get more phytates (binding minerals) that make them less available for absorption. Get protein by eating complementary plant proteins (rice, beans)
Term
Nitrogen Balance
Definition
excreted as proteins are recycled or used, we use the balance of nitrogen to evaluate whether or not a person is consuming enough protein
If nitrogen input=nitrogen output, nit balance
N intake> N output, positive N balance (pregnant woman,growing kids, illness recovering)
N intake< output, neg N balance (staving, weight loss diets, illness, infection)
Term
Protein & Heart Disease
Definition
Kidney Function, Mineral Losses, Obesity, Heart Disease, Cancer, Gout
hypertension and atherosclerotic plaques in heart, increase in fat concumption
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