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Proteins are plant compounds needed to develop and repair diverse human tissues. Proteins are chemical nutrients that are essential for the construction of various human tissues as well as the repair of worn-out cells. Globular proteins, fibrous proteins, and membrane proteins are the three main types of proteins. All of these categories have tertiary structures linked with them.
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Key terms: Globular, Membrane, Fibrous, Hemoglobin, Collide, Acids, Ligament
Types of Protein
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Basically, there are three types of protein :
- Globular protein: The structure of globular proteins is round. These are among the most common protein kinds. Globular proteins aid in the functioning of the body. The majority of these proteins are miscible with water and create suspended particles. They function as reactors, mediators, carriers, controllers, and structural proteins in some cases. A familiar globular protein is hemoglobin.
- Fibrous protein: Sheet-like cylindrical structures make up fibrous proteins. Aqueous solubility of fibrous proteins is poor. By creating muscles and tendons, ligaments, and fibrous tissue, these proteins provide protection and provide a significant function. Consistent amino acid sequences make up fibrous proteins. Gelatin is the most common type of fibrous protein.
- Membrane proteins: Membrane proteins, as the name implies, are commonly encountered in membranes and are present in them. Medicinal medications target them because they interact with biological membranes. These aid in the transmission of receptor signals between the cell’s internal and exterior surroundings. They also aid in the movement of molecules and allow for molecular interaction. Membrane proteins are divided into two categories: integral membrane proteins and peripheral membrane proteins.
Difference between Globular and Fibrous Protein
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A Globular protein is cylindrical in shape and has the property of forming colloids with water. It disintegrates in water. Because of their form, globular proteins are also known as hemoproteins. Scleroproteins are another name for fibrous proteins. Fibrous proteins are extended strand-like structures that typically appear as rods or wires.
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The differences between Globular and Fibrous Protein are mentioned below:
| Basis | Globular protein | Fibrous protein |
|---|---|---|
| Definition | Globular protein is a form of soluble protein that has a role in metabolic activities. | Fibrous proteins are a form of insoluble protein that makes up the body's major structural components. |
| Purpose | Globular proteins are functional because they perform a specific biological role in the body. | These proteins are structural, meaning they assist to enhance cell form by acting as a framework. |
| Example | Hemoglobin, myoglobin, insulin | Keratin, collagen |
| Shape and structure | Globular proteins have a packed roller structure and are round or circular in form. | Fibrous proteins have a spiral or piece of cardboard structure and are long and thin in shape. |
| Solvability in various solvents | Liquid, chemicals, and acids are all solvent in globular proteins. | Only powerful acids can dissolve fibrous proteins. Water and other weak acids and bases are insoluble in them. |
| Intermolecular forces | The intermolecular force between globular proteins is modest. | Fibrous proteins are held together by a strong intermolecular force. |
| Resilience | Changes in temperature and pH have a lower sensitivity. | Temperature and pH are more sensitive. |
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Things to remember
- Globular protein is a form of soluble protein that has a role in metabolic activities.
- Fibrous proteins are a form of insoluble protein that makes up the body’s major structural components.
- Scleroproteins are another name for fibrous proteins.
- Globular proteins are extremely branched or coiled structures that are in charge of transporting critical resources like oxygen via blood.
- Fibrous proteins are responsible for the creation of muscle and tendon motions at a joint.
Sample Questions
Ques. What is the difference between Globular and Fibrous protein on the basis of structure of protein? (3 marks)
Ans: A Globular protein is cylindrical in shape and has the property of forming colloids with water. It disintegrates in water. Because of their form, globular proteins are also known as spheroproteins. Scleroproteins are another name for fibrous proteins. Fibrous proteins are extended strand-like structures that typically appear as rods or wires. Keratin, collagen, and elastin are all fibrous proteins, but hemoglobin is a globular protein. Keratin can be found in hair, horns, nails, and feathers, among other places.
Ques. What do you understand by Globular protein? (5 marks)
Ans: Globular proteins are round, water-soluble proteins. Globular proteins are involved in the creation of several important structures in the human body. They can make enzymes, which are helpful in catalyzing organic reactions in living things.
They generate messengers that aid in the delivery of messages throughout the body, allowing biological processes to be regulated. Other compounds are transported across membranes as well. They are responsible for all of the body's regulating functions. Weak intermolecular hydrogen bonds hold the globular proteins together.
Ques. Explain in detail about Fibrous protein? (5 marks)
Ans: Scleroproteins are another name for fibrous proteins. They take the form of extended strands of peptide bond, such as rods and wires, which leads in the production of a sheet-like structure. These proteins are not soluble in water and can only be dissolved in strong acids, which distinguishes them from other proteins.
They are employed to offer strength and support to other cells and tissues during the creation of extremely tough tissues. Tendons, connective tissues, and fibers are the principal products of their work. The peptide chains of fibrous proteins are kept together by extremely strong intermolecular hydrogen bonds.
Ques. Explain about the functions of protein? (4 marks)
Ans: Enzymes: Enzymes are proteins that govern a variety of metabolic reactions in the body. Digestive enzymes, for example, are protein-based and aid digestion.
Movement: Myosin, a protein present in muscles, controls the contraction and expansion of muscles to allow movement.
Stability and guidance: Proteins provide stability and guidance for a variety of structures in cells and tissues. Keratin, a structural protein present in mammals, is responsible for the growth of hair, nails, and horns.
Antibodies: Antibodies play an important function in protecting our bodies from antigens and infections. Antibodies are mostly composed of proteins.
Ques. What do you understand by membrane proteins? (3 marks)
Ans: Membrane proteins, as the name implies, are commonly encountered in membranes and are present in them. Medicinal medications target them because they interact with biological membranes. These aid in the transmission of receptor signals between the cell’s internal and exterior surroundings. They also aid in the movement of molecules and allow for molecular interaction.
Ques. How does protein act as messenger and cellular communication? (3 marks)
Ans: Cellular communication - Effectors on the surface of cells allow cells to respond to one another. Proteins make up these receptors.
Act as a messenger - These proteins act as chemical messengers, allowing cells, tissues, and organs to communicate with one another.
Ques. What is the difference between Globular and Fibrous protein-based functions? (4 marks)
Ans: Globular proteins serve a variety of purposes, including forming enzymes, cellular messengers, and amino acids, whereas fibrous proteins serve only as structural proteins. Globular proteins are extremely branched or coiled structures that are in charge of transporting critical resources like oxygen via blood. Haemoglobin, immunoglobins, insulin, and milk-protein casein are all derived from globular proteins. They also help to make amino acids, which are the basic building blocks of all proteins.
Fibrous proteins are required for the development of stiff components such as connective tissue, tendons, and muscle fibres. Collagen is found in abundance in all of our connective tissues.
Ques. Whey proteins are called building blocks? (4 marks)
Ans: Because proteins make up a significant percentage of your body. Muscles, veins, blood, skin, hair, and nails are almost entirely composed of protein. Enzymes perform all of the subtle, difficult labour of snipping and clipping, cutting and pasting, creating and breaking, burning and making. Organs are primarily composed of protein. Bones are mostly made of protein. Even fat tissue, which has the lowest protein content, contains a protein scaffolding and support network.
Ques. Differentiate between Globular and Fibrous protein? (5 marks)
Ans:
| Basis | Globular protein | Fibrous protein |
|---|---|---|
| Definition | Globular protein is a form of soluble protein that has a role in metabolic activities. | Fibrous proteins are a form of insoluble protein that makes up the body's major structural components. |
| Purpose | Globular proteins are functional because they perform a specific biological role in the body. | These proteins are structural, meaning they assist to enhance cell form by acting as a framework. |
| Example | Hemoglobin, myoglobin, insulin | Keratin, collagen |
| Shape and structure | Globular proteins have a packed roller structure and are round or circular in form. | Fibrous proteins have a spiral or piece of cardboard structure and are long and thin in shape. |
Ques. Define in short: (4 marks)
a) Globular protein
b) Fibrous protein
Ans: (a) Globular protein: Albumin, insulin, and hormones like oxytocin are examples of water-soluble proteins composed comprised of polypeptides that are coiled around themselves to form oval or spherical structures.
(B) Fibrous protein: These proteins are coiled and exist in threadlike structures to form fibres, and they are insoluble in water and resistant to proteolytic enzymes. Collagen, actin, and myosin, as well as the keratin in hair, claws, and feathers, are examples. Animals are the primary source of these proteins.
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| Eukaryotic Cells | Endomembrane System | Mitochondria |
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| Vitamin B | Diagram of Mitochondria | Lipids |
| Biology Study Guides | ||
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| NCERT Solutions for Class 11 Biology | Biology Study Material | Difference between in biology |
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