Nutrition Chapter 6: Proteins

Nutrition

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Proteins
Large, complex molecules made up of amino acids and found as essential components of living cells
Amino acids
Nitrogen-containing molecules that combine to form proteins
Essential amino acids
Amino acids not produced by the body that must be obtained from food
Non-essential amino acids
Amino acids that can be manufactured by the body in sufficient quantities and therefore do not need to be consumed regularly in our diet
Transamination
The process of transferring the amine group from one amino acid to another to manufacture a new amino acid
Peptide bonds
Unique types of chemical bonds in which the amine group of one amino acid binds to the acid group of another to manufacture dipeptides and all larger peptide molecules
Gene expression
The process of using a gene to make a protein
Transcription
The process through which mRNA copies genetic information from DNA in the nucleus
Translation
The process that occurs when the genetic information carried by mRNA is translated into a chain of amino acids at the ribosome
Denaturation
A change in the shape of a protein caused by heat, acids, bases, heavy metals, alcohol, or other substances; results in protein loosing its ability to function
Limiting amino acid
The essential amino acid that is missing or in the smallest supply in the amino acid pool and is thus responsible for slowing or halting protein synthesis
Incomplete proteins
Proteins that do not contain all the essential amino acids in sufficient amounts to support growth and health
Complete proteins
Proteins that contain all nine essential amino acids. Proteins from animal sources are complete proteins. Soybeans are the only complete source of plant protein
Mutual supplementation
The process of combining two or more incomplete protein sources to make a complete protein
Complementary proteins
2 or more foods together contain all nine essential amino acids necessary for a complete protein. it is not necessary to eat complementary foods at the same meal