Questions and Answers
What can proteins be classified by?
Shape, solubility in water, salt, acid, base and alcohol.
What is another name for simple proteins?
Globular proteins
What are simple (globular) proteins?
Those yielding only amino acids or their derivatives on hydrolysis; abundant in nature, soluble in water, dilute acids or bases, alcohol.
What are the types of globular proteins?
Signup and view all the answers
What types of proteins are soluble in water?
Signup and view all the answers
Which proteins are soluble in dilute neutral solutions of salts?
Signup and view all the answers
What types of proteins are soluble in dilute acids or bases?
Signup and view all the answers
What types of proteins are soluble in alcohol?
Signup and view all the answers
What are fibrous proteins?
Signup and view all the answers
What are the types of fibrous proteins?
Signup and view all the answers
What are collagens?
Signup and view all the answers
When do collagens become digestible?
Signup and view all the answers
What is an example of food from collagens?
Signup and view all the answers
What are elastins?
Signup and view all the answers
What feed contains elastins?
Signup and view all the answers
What are keratins?
Signup and view all the answers
What are conjugated proteins?
Signup and view all the answers
What are conjugated nucleoproteins?
Signup and view all the answers
What are conjugated glycoproteins (mucoproteins)?
Signup and view all the answers
What are conjugated phosphoproteins?
Signup and view all the answers
What are conjugated hemoproteins?
Signup and view all the answers
What is hematin?
Signup and view all the answers
What are conjugated lecithoproteins?
Signup and view all the answers
What is lecithin?
Signup and view all the answers
What are conjugated lipoproteins?
Signup and view all the answers
What are conjugated metalloproteins?
Signup and view all the answers
What is a true protein?
Signup and view all the answers
What is nonprotein nitrogen (NPN)?
Signup and view all the answers
What is crude protein?
Signup and view all the answers
What is digestible protein?
Signup and view all the answers
Study Notes
Protein Classification
- Proteins can be classified based on their shape, solubility in water, and response to salt, acid, base, and alcohol.
- Simple proteins are also referred to as globular proteins.
Simple (Globular) Proteins
- Yield only amino acids upon hydrolysis and are abundant in nature, being soluble in water, dilute acids, bases, and alcohol.
Types of Globular Proteins
- Include albumins, histones, protamines, globulins, glutelins, and prolamins.
Water-Soluble Proteins
- Include albumins, histones, and protamines.
Salt-Soluble Proteins
- Globulins dissolve in dilute neutral solutions of salts.
Acid/Base-Soluble Proteins
- Glutelins are soluble in dilute acids or bases.
Alcohol-Soluble Proteins
- Prolamins are proteins that dissolve in alcohol.
Fibrous Proteins
- Comprise about 30% of total protein content in the animal body, particularly in connective tissue.
- These proteins are insoluble in water and resistant to digestive enzymes.
Types of Fibrous Proteins
- Include collagens, elastins, and keratins.
Collagens
- Are water-insoluble proteins that become digestible after conversion to gelatin in dilute acids or bases.
- An example food source from collagens is hydrolyzed feather meal.
Elastins
- Similar to collagens but cannot convert to gelatin; found in soybean meal.
Keratins
- Highly insoluble and resistant to digestive enzymes, containing up to 15% cystine.
- They feature disulfide bonds, contributing to their resistance against digestion.
Conjugated Proteins
- Formed when simple proteins combine with non-protein compounds.
Types of Conjugated Proteins
- Nucleoproteins: Contain nucleic acid.
- Glycoproteins (Mucoproteins): Contain carbohydrates.
- Phosphoproteins: Contain phosphorus.
- Hemoproteins: Include hematin, which aids in iron absorption through vitamins and minerals.
- Lecithoproteins: Contain lecithin found typically in soybeans, which prevents oxidation.
- Lipoproteins: Contain lipids.
- Metalloproteins: Complexed with metals.
Protein Definitions
- True Protein: Composed only of amino acids.
- Nonprotein Nitrogen (NPN): Compounds which contain nitrogen but are not classified as true protein.
- Crude Protein: Represents total protein, including true protein and other nitrogenous substances.
- Digestible Protein: The difference between protein present in feed and protein excreted in feces; indicates the amount of protein digested.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the classification of proteins through this set of flashcards. Learn about their different types, such as simple proteins and globular proteins, along with key terms associated with their properties. Great for anyone studying biology or biochemistry!
