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The primary constituents of a cell are cell organelles, which perform a variety of roles within the cell. Lysosomes and ribosomes are two such organelles found in nearly all living organisms.
- Lysosomes are only found in animal cells, but ribosome is found in both animal and plant cells.
- We can understand the difference between lysosomes and ribosomes by knowing their different functions.
- Ribosomes are responsible for protein synthesis and are present within the cellular structure.
- Lysosomes are membrane-bound organelles that remove infections that enter the cell.
| Table of Content |
Key Terms: Lysosome, Ribosome, Prokaryotic cell, Eukaryotic cell, Organelles, Protein synthesis, Enzymes, Biomolecules
What are Ribosomes?
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A ribosome is a molecular machine found in both prokaryotic and eukaryotic cells.
- It helps in the joining of amino acid precursors in the order dictated by messenger RNA (mRNA).
- It is made up of two unequal subunits known as the small and large subunits.
- They are responsible for the formation of particular proteins in live cells.
- They create proteins that serve as building blocks for biological architecture.
- Ribosomes help in the restoration of tissues that have been injured.
- It produces a variety of enzymes that help to speed up chemical reactions.
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|---|---|---|
| Transportation in Plants | Excretion | Excretion in Plants |
| Cell Organelles | Structure of RNA | Lysosomal Storage Disease |
What are Lysosomes?
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Lysosomes are membrane-bound organelles that break down a variety of biomolecules, including nucleic acids, peptides, carbohydrates, and lipids.
- They are spherical vesicles containing a large number of hydrolytic enzymes that break down molecules.
- They are the waste disposal system of the cell.
- Hydrolase enzymes in lysosomes help to remove old cells and waste products from cells.
- Lysosomes are also known as "suicide sacs" because their enzymes disintegrate worn-out cells.
- They are surrounded by a barrier that prevents their enzymes from working in cells.
Difference Between Lysosomes and Ribosomes
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The following are the differences between ribosomes and lysosomes
| Specific | Ribosome | Lysosome |
|---|---|---|
| Presence of Membrane | A membrane does not surround the ribosome. | A membrane surrounds the lysosome. |
| Type of Cell | Both prokaryotic and eukaryotic cells have ribosomes. | Only eukaryotic animal cells include lysosomes. |
| Size | Ribosomes are rather small, around 20-30 nm in diameter. | Lysosomes are huge, measuring between 0.1 and 1.2 μm in diameter. |
| Composition | Ribosomes are made up of ribosomal proteins and rRNA. | Membrane proteins and digestive enzymes make up the lysosome. |
| Localization | Ribosomes can either be found attached to the endoplasmic reticulum or scattered throughout the cytoplasm. | In the cytoplasm, lysosomes are evenly distributed. |
| Segmentation | Ribosomes are made up of two unequal subunits, the small and big subunits. | The lysosome is not divided into segments. |
| Function | Protein synthesis is carried out by ribosomes. They are also crucial in the translation process. | Lysosomes are enzymes that break down old or dysfunctional cells. Foreign infections such as bacteria and viruses are also destroyed by this organelle. |
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|---|---|---|
| Autotrophic Nutrition | Heterotrophic Nutrition | Nutrition in Human Beings |
| Acclimatization | Acoustic neuroma | Biosafety issues |
Things to Remember
- All animal cells have lysosomes, which are membrane-bound organelles.
- Lysosomes are membrane-bound organelles that remove infections that enter the cell.
- Ribosomes are responsible for protein synthesis and are present within the cellular structure.
- The ribosome helps in the joining of amino acid precursors in the order dictated by messenger RNA (mRNA).
- Ribosomal RNA (rRNA) and ribosomal proteins make up the ribosome.
Sample Questions
Ques: Why are lysosomes referred to as "cell scavengers"? (3 Marks)
Ans: Lysosomes are cellular organelles with a single membrane. They have a lot of hydrolytic enzymes that eliminate bacteria and other foreign substances inside the cell. It also digests cell organelles that aren't performing properly. As a result, they're also referred to as suicide bags. They eliminate cell debris throughout these procedures. Lysosomes are known as scavengers of the cells because they eliminate unwanted particles and organelles from the cell.
The lysosomes release digesting enzymes that disintegrate all of the cells if something bursts. Cells die as a result of this. As a result, Lysosomes are known as "cell suicide bags."
Ques: What are the two primary functions of lysosomes? (1 Mark)
Ans: Lysosomes have two primary functions: they digest macromolecules including carbohydrates, proteins, lipids, and nucleic acids, and they aid in the elimination of bacteria, viruses, and other antigens.
Ques: What are the components of a ribosome? What is the function of the ribosome? (2 Marks)
Ans: A ribosome is made up of two components: small ribosomal subunits, which read mRNA, and giant ribosomal subunits, which make up polypeptide chains of amino acids. During protein synthesis, the ribosomal subunits come together and interact with the mRNA. They attach to the mRNA and initiate protein synthesis.
Ques: What distinguishes bacterial ribosomes from eukaryotic ribosomes? (2 Marks)
Ans: The major ribosomal subunit, the 80s, is found in prokaryotic ribosomes, which contain three separate rRNA molecules. The small ribosomal subunit, the 70s, is found in eukaryotic ribosomes, which contain four distinct rRNA molecules.
Ques: Who discovered lysosome? (1 Mark)
Ans: Christian de Duve was recognized for his role in the discovery of lysosomes when he was awarded the Nobel Prize in Physiology or Medicine in 1974.
Ques: What are the two different types of ribosomes? (1 Mark)
Ans: The two different types of ribosomes are
- 70 S-found in prokaryotic cells
- 80 S-found in eukaryotic cells
Ques: Lysosomes are found in which types of cells? Do lysosomes exist in plant cells? (2 Marks)
Ans: Lysosomes are found only in eukaryotic animal cells. Lysosomes and other membrane-bound organelles are absent in prokaryotic cells such as bacteria.
Plants do not have lysosomes; however, vacuoles perform the function of lysosomes. According to the findings, vacuoles contain hydrolytic enzymes that are identical to those found in animal cells.
Ques: What is the difference between Ribosomes and rRNA? (2 Marks)
Ans: Ribosomal RNA makes up ribosomes (rRNA). To put it another way, rRNA is a non-coding ribonucleic acid that is essential for protein synthesis in ribosomes. Small and big ribosome subunits are formed when rRNA is transcribed from rDNA and bound to ribosomal proteins.
Ques: How Do Lysosomes and Ribosomes differ? (2 Marks)
Ans: Lysosomes are membrane-bound cell organelles found mostly in eukaryotic animal cells, where they serve as a waste disposal mechanism by degrading various biomolecules using hydrolytic enzymes. Ribosomes, on the other hand, are the cell's protein-making macromolecular machinery that carries out protein synthesis from messenger RNA and is so known as translational apparatus.
Ques: What are the major differences between lysosomes and ribosomes? (3 Marks)
Ans: The major differences between lysosomes and ribosomes are:
| Ribosome | Lysosome |
|---|---|
| A ribosome is not surrounded by a membrane. | A membrane surrounds the lysosome. |
| Ribosomes are found in both prokaryotic and eukaryotic cells. | Only eukaryotic animal cells include lysosomes. |
| The diameter of a ribosome is roughly 20-30 nanometers | Lysosomes are relatively large organelles, ranging in size from 0.1 to 1.2 micrometers in diameter. |
| Ribosomes exist either attached to the endoplasmic reticulum or free-floating in the cytoplasm. | In the cytoplasm, lysosomes are evenly distributed. |
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