Study sets, textbooks, questions
Upgrade to remove ads
UCBX Human Nutrition Quiz 5
Chap 7 - Proteins & Nitrogen balance
Terms in this set (32)
An 18 month old infant who gets weaned off her mother's milk and starts a diet of rice water will develop _____________ disease. This is a type of PEM. (PEM stands for _________________________.) If the infant does not receive enough calories, she will develop __________.
After complete digestion of dietary proteins, _____________________ will be absorbed into the blood stream. Digestibility of proteins by humans is scored by a scoring system known as ___________________________.
amino acids and small di- and tripeptides
protein digestibility-corrected amino acid score (PDCAAS)
The combination of rice and beans makes for a complete protein because _____________________________.
each has the amino acid that the other one is deficient in (rice is deficient in lysine but beans have a lot of lysine. Beans are low in methionine, but rice has a lot of methionine)
PDCAAS of grains is about _______, whereas that of whey and soy is __________.
0.4 to 0.5
1.00 (max score)
In people with phenylketonuria, amino acid _________ becomes an essential amino acid because ____________________________________.
we make tyrosine from phenylalanine and the diet of a phenylketonuria patient is severely deficient in phenylalanine
Elevated levels of amino acid _______________ is associated with cardiovascular disease.
A body builder is taking amino acid supplements in addition to having a protein rich diet. This person is probably in ________ nitrogen balance and excretes excessive amounts of _______ in his urine.
We need dietary protein because ___________________________________.
we need their building blocks - the amino acids - to make our own proteins
While adult RDA for protein is _________, resistance and endurance athletes may need as much as ________.
0.8 grams/Kg of body weight
1.2 to 1.6 grams/Kg of body weight
Plant sources of complete protein include _____________________.
soy, quinoa, buckwheat or seitan
[A] There are ___ types of proteins needed by humans. __ are essential AAs.
[A] Amino Acids are formed by ____________ reaction, linked together by __________ bonds.
[A] 2AAs =
4-10 AAs =
11-99 AAs =
100 AAs =
[A] Protein structure:
(1) Pri sequence of AAs, 3D = function of protein
(2) Secondary - weak H bonds of AAs, alpha-helix, beta-pleated sheets, regional only
(3)Tertiary - caused by folding of polypeptide chains to prod 3D shape. Formed by bonds b/w R group. Not stable, denatured (unfolding) by pH, temp, alcohol, oxidation, and agitation.
(4) Quaternary - forms when a # of polypeptide chains are covalently joined. made from multiple polypeptides eg. hemoglobin (4 types)
[A] Diseases caused by the malfolding of polypeptide chains include:
This is not natural confirmation, where cells change their shapes naturally.
Alzheimer's, Parkinson's, sickle cell, mad cow
[A] Denaturation happens first in the __________, by acidic pH. Then they are partially broken down from proteins to ___________________________.
stomach, oligopeptides or polypeptides
[A] The body can make __________________ AAs, but cannot make __________________ AAs. ___________________ AAs are AAs that become essential under circumstances.
[A] Conditionally Essential AAs
[A] Conditionally essential AAs like ______________ and ________________ cannot be synthesized de novo (made from scratch). However, they can be converted ______________ to each other through an intermediate, _______________.
back and forth
[A] Another conditionally essential AA ______________ is essential for people with _______________, who will get very ill if they consume meat or dairy products. As ___________ is made from _____________,and cannot be made de novo, this explains why its essential.
[A] Different AAs are fed into different parts of the (1)___________ cycle, to get energy out of protein (4Kcal/g). Some are turned into (2)________________, (3)________________, or enter the (4)_________________ cycle.
(2) Acetyl CoA
(3) Pyruvic acid
(4) citric acid / Krebs
[A] ____________ is ingested primarily as protein, and the excess is secreted as ________. ____________ is the splitting off and Amino group into Ammonia, then urea. What is left is a carbon skeleton, and is used to make other _______, _________, or _______.
Nitrogen, urea, deamination
AAs, sugar, fat
[A] If the kidneys are damaged, urea levels will ___________. If this continues for 4-5 days, you will go into a _____________________ as there is too much uric acid and nitrogen in the body.
increase, hyperureacemic coma
[A] The end products of protein digestion are:
ATP, H2O, CO2, Urea
[A] Nitrogen balance = Nitogen ________ - Nitrogen ________. A positive N balance is ________ N ingested than excreted, while a negative N balance is __________ N ingested than excreted.
[A] Excess AAs can be converted into ______ & ______.
[A] When would you need more Nitrogen?
[A] Complete Proteins
- supply all indispensable AAs
- animal proteins
- soy, buckwheat, quinoa
[A] Incomplete Proteins
- low in one or more indispensable AAs
- plant protein
[A] PDCAAS (FDA/WHO)
Top 1.0 =
Whey, casein, albumin, soy
beef, veal, pork
enough cal, not enough protein
edema* & other signs
ages 18-24 months
assoc w extreme poverty
*BIG belly as insufficient AA to prod Albumin which pulls water into the blood, no Albumin = tissue fluid build up aka edema (accumulated in peritoneal sac)
not enough cal, not enough protein
infants 6 - 18 mths
terminal adults / end-stage cancer / alcoholic liver disease
Skin & bones
Sets found in the same folder
Nutrition Presentation Questions
UCBX Human Nutrition Quiz 0
UCBX Human Nutrition Quiz 1
UCBX Human Nutrition Quiz 2
Sets with similar terms
Chapter 6- The Proteins & Amino Acids
Chapter 6: Proteins & Amino Acids
Chap. 7- Proteins and Amino Acids
Other sets by this creator
PTCB Must-Know Conversions
Common drug name abbrev
Physio Qs from Txtbk
Other Quizlet sets
IB Bio Sem Exam 12/14
Self-care in a high burnout profession
ACC 219 Chapter 8
Stuff We Dont Know