Question

definition
examples
1.
2.
protein
picture/characteristics
1.
2.
non-examples

Explanation:

The problem is about "Protein", which falls under Biology (a subfield of Natural Science). To fill the table:

Definition:

Proteins are large, complex molecules made up of amino acid chains. They play crucial roles in the structure, function, and regulation of the body's cells, tissues, and organs.

Examples:

1. Enzymes (e.g., Amylase, which helps in breaking down starch)
2. Hemoglobin (transports oxygen in the blood)

Picture/Characteristics:

• Proteins are polymers of amino acids linked by peptide bonds.
• They have different structural levels: primary (sequence of amino acids), secondary (e.g., alpha - helices, beta - sheets), tertiary (3 - D structure of a single polypeptide), and quaternary (structure of multiple polypeptide chains).
• They can be globular (e.g., enzymes, hemoglobin) or fibrous (e.g., collagen, keratin).

Non - Examples:

1. Carbohydrates (e.g., Glucose, Starch - they are made of sugar units and have different functions and structures compared to proteins)
2. Lipids (e.g., Fats, Oils - they are hydrophobic molecules, mainly involved in energy storage and cell membrane structure, different from proteins)

Answer:

Definition: Proteins are large, complex molecules made up of amino acid chains, playing crucial roles in cell/tissue/organ structure, function, and regulation.

Examples: 1. Enzymes (e.g., Amylase) 2. Hemoglobin

Picture/Characteristics: Polymers of amino acids (peptide bonds), structural levels (primary - quaternary), globular/fibrous forms.

Non - Examples: 1. Carbohydrates (e.g., Glucose) 2. Lipids (e.g., Fats)