FNH 250 Study Guide - Final Guide: Pancreatic Juice, Peanut Butter, Phaseolus Lunatus

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Published on 5 Jul 2017
School
UBC
Department
Food, Nutrition and Health
Course
FNH 250
Professor
FNH 250 Nutrition Concepts & Controversies
PROTEINS: AMINO ACIDS
At the end of the chapter, it is expected that you should be able to:
Describe the basic structure of proteins and how proteins differ from carbohydrates and fat.
Amino acid is the basic building block of protein, it contains a hydrogen atom, an R group (side
chain), a carboxyl group, and an amino group attached to the central carbon atom. Different side
chains give amino acids different properties.
Instead of being made up of repeating units of the same molecule like glucose in CHO, protein is a
sequence of different amino acids. Unlike carbohydrates and fat which are major sources of energy,
protein is a minor source of energy. Excess protein are not stored in the body.
Distinguish between essential and non-essential amino acids from a nutritional perspective.
Essential amino acids are amino acids that the body cannot synthesize at all or in adequate quantities
to meet body needs. It must be obtained from diet. There are 10 essential aa for children and 9 for
adults.
Non-essential amino acids can be synthesized in cells via transamination. Transamination is the
transfer of an amino group from one amino acid to a C-skeleton (keto-acid) to form a new amino acid.
This process requires vitamin B6.
Define the term ‘protein turnover’ and explain its importance in human health.
Protein turnover is the recycling of amino acids. It is the synthesis and degradation of endogenous
proteins in the body. It is important to human health because it helps reducing our dietary need to take
in large quantities of protein.
Define the term ‘complete protein’. Name 3 food examples.
Complete proteins
Provide all the eaa in adequate quantities that support human growth, maintenance and repair
Efficient use in body because pattern of eaa provided in food closely matches pattern of eaa
need by humans
Generally animal foods
Examples: eggs, beef, milk, fish (water-packed tuna is the most PRO-dense food)
Identify at least 3 different combinations of plant foods that will provide a complete complement of
the essential amino acids.
1. Grains & Legumes e.g. Rice and red beans
2. Nuts, Seeds & Vegetables e.g. sunflower seeds and broccoli
3. Nuts, Seeds & Legumes e.g. Almonds and lima beans
4. Grains & Legumes e.g. White bread and peanut butter
Name the process of catabolizing body proteins for metabolic use in the body.
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Document Summary

At the end of the chapter, it is expected that you should be able to: Describe the basic structure of proteins and how proteins differ from carbohydrates and fat. Amino acid is the basic building block of protein, it contains a hydrogen atom, an r group (side chain), a carboxyl group, and an amino group attached to the central carbon atom. Different side chains give amino acids different properties. Instead of being made up of repeating units of the same molecule like glucose in cho, protein is a sequence of different amino acids. Unlike carbohydrates and fat which are major sources of energy, protein is a minor source of energy. Excess protein are not stored in the body. Distinguish between essential and non-essential amino acids from a nutritional perspective. Essential amino acids are amino acids that the body cannot synthesize at all or in adequate quantities to meet body needs.

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