Proteins:
* Definition: Proteins are large, complex molecules made up of long chains of amino acids. They are essential for almost every function in the body.
* Function: Proteins have a vast array of roles, including:
* Structural support: Collagen and keratin provide strength and structure to tissues.
* Enzymes: Catalysis of chemical reactions.
* Hormones: Chemical messengers that regulate bodily functions.
* Antibodies: Defending against pathogens.
* Transport: Hemoglobin carries oxygen in the blood.
* Storage: Proteins can store amino acids and other nutrients.
* Examples: Collagen, keratin, hemoglobin, insulin, antibodies.
Enzymes:
* Definition: Enzymes are a special type of protein that acts as biological catalysts.
* Function: They speed up chemical reactions within living organisms without being consumed in the process. They do this by lowering the activation energy of the reaction.
* Specificity: Enzymes are highly specific, meaning each enzyme typically catalyzes only one or a small number of reactions.
* Examples: Amylase (breaks down starch), lactase (breaks down lactose), DNA polymerase (involved in DNA replication).
Key Differences:
* Specificity: All enzymes are proteins, but not all proteins are enzymes. Enzymes are highly specific in their function, while proteins have a wide range of functions.
* Catalytic Activity: Enzymes act as catalysts, speeding up chemical reactions, while proteins perform various functions beyond catalysis.
* Active Site: Enzymes have a specific three-dimensional structure called an active site, which allows them to bind to specific molecules and catalyze reactions.
Think of it this way:
* Proteins are like tools: They can be used for many different purposes (building, transporting, defending).
* Enzymes are like specialized tools: They are specifically designed to facilitate a particular job (speeding up a reaction).
