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Nutrition Quiz 5

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Question
Answer
What are the building block of proteins?   Amino acids (AA)  
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Non essential AA   produced in the body  
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Essential AA   not produced in the body and need to be taken in through diet  
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How many essential AA are there?   9  
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What are the 9 essential AA?   histidine, isoleucine, leucine, lysine, methionine, phenylanine, threonine, typtophan and valine  
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Conditional   Needed in times of illness and stress  
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What are the 2 categories of proteins?   Complete and incomplete protein  
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Complete protein   Source of protein that contains an adequate proportion of all 9 essential AA (meat sources)  
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Incomplete protein   A source of protein lacking in 1 or more of the essential AA (non-meat sources)  
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How do our brains concentrate and focus?   By feeding off amino acids  
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What is in a protein?   Carbon, hydrogen, oxygen, and nitrogen  
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What is the structure of the amino acid?   A central carbon atom, hydrogen atom, an amino group, and an acid group attached to it  
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What do peptide bonds do?   Unite each amino acid to the next end-to-end to form a link in a protein chain  
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Dipeptide   two amino acids bonded  
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Tripeptide   three  
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Oligopeptide   4-9 amino acids  
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Polypeptide   10 or more  
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Denaturation   When proteins are subjected to heat, acid, other conditions that disturb their stability causing the bonds to uncoil or be destroyed  
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Where does protein hydrolysis (breakdown) partially begin?   Stomach  
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Why does hydrochloric acid denature (uncoil) protein strands?   Digestive enzyme can attack individual peptide bonds  
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Peptin (Gastric enzyme)   Activated by hydrochloric acid, cleaving proteins into smaller polypeptides and amino acids  
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Protease   Enzyme further hydrolyzes proteins in small intestine into shorter chains  
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Peptidase   Final digestive enzyme hydrolyzes proteins into tri, di, and singular peptides (amino acids) for absorption into the intestinal walls or to the liver for further protein turnover.  
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Protein turnover   Degradation and synthesis of protein (Measured by consumption/excretion of nitrogen)  
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Examples of Complete Proteins   Meat, Fish, and Dairy  
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Examples of Incomplete Proteins   Vegetables, Nuts, and Grains  
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How much of our bodies are made up of proteins?   17% (every cell in the human body contains proteins)  
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What are proteins mainly used for?   Function and helps produce energy. NOT used for storage or to recall on for energy  
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How many kcal/gram of proteins?   4  
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What type of meals help keep you feeling fuller longer?   high protein meals  
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What do proteins help with?   Repair cell and make new ones  
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What are proteins necessary for?   Optimal growth, development and repair  
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What is the RDA for proteins   10-35% total calories for the average person  
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Children, teens, and pregnant women need higher protein intake to support what?   Growth?  
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What is the specific recommendation for protein consumption?   0.8g/kg body weight  
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Diets too high in protein can lead to   disease accelerations such as Chronic Kidney Disease  
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Diets too low in protein can lead to   increase in protein synthesis and degradation of protein in the body  
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Examples of effects from diets to low in protein   slowed growth, impaired brain/kidney function, weakened immunity, inadequate nutrient absorption  
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What type of condition can be caused from a low protein diet   Edema (plasma proteins leak out of the blood vessels into the interstitial spaces causing swelling.)  
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Which AA are conditionally essential because we can produce them but only under healthy circumstances?   Arganine, Cysteine, Glutamine, Glycine, Proline, Tyrosine  
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When can’t we make these conditionally AA?   starvation or inborn error of metabolism.  
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