Functions of Proteins:

• Enzymes: Proteins act as biological catalysts, speeding up chemical reactions in the body.
• Structural Support: Proteins provide structure and support to cells, tissues, and organs.
• Transport: Some proteins help transport molecules, such as oxygen or nutrients, throughout the body.
• Immune Function: Antibodies are specialized proteins that help the body defend against foreign invaders.
• Hormones: Certain proteins act as chemical messengers, regulating various bodily functions.
• Muscle Contraction: Proteins are essential for muscle movement and function.

Sources of Proteins:

Proteins are found in a variety of foods, including:

• Meat and poultry
• Fish and seafood
• Eggs and dairy products
• Legumes (beans, lentils, peas)
• Nuts and seeds
• Tofu and other soy products

Protein Structure:

Proteins have a complex structure that consists of four levels:

1. Primary Structure: The specific sequence of amino acids in the protein chain.
2. Secondary Structure: The folding of the protein chain into alpha helices or beta sheets.
3. Tertiary Structure: The 3D arrangement of the entire protein molecule.
4. Quaternary Structure: Some proteins are made up of multiple subunits that come together to form the functional protein complex.

Study Guide:

When studying proteins, it's important to focus on the following key points:

1. Understand the role of proteins in the body and their diverse functions.
2. Learn about the different sources of dietary proteins and their importance in a balanced diet.
3. Explore the structure of proteins, including the four levels of organization.
4. Consider the impact of protein deficiency or excess in the diet on overall health.
5. Examine specific examples of proteins and their functions, such as enzymes, antibodies, and structural proteins.