Facts About Ribosomes: Ribosomes are made up of RNA and protein subunits and are responsible for protein synthesis. They are present either freely in the cytoplasm or bound to the endoplasmic reticulum. Ribosomes function to translate messenger RNA (mRNA) into proteins by assembling amino acids in a sequence dictated by the mRNA’s nucleotide sequence.

Ribosomes are essential for various cellular functions and the synthesis of proteins necessary for growth, development, and metabolism. In this article, we will study ribosomes, their functions, and interesting facts related to them.

What are Ribosomes?

Definition of Ribosomes: Ribosomes are cellular structures found in all living organisms, essential for translating genetic information into proteins.

Ribosomes are made up of two subunits: a small subunit and a large subunit. The small subunit binds to messenger RNA (mRNA), which contains the genetic code for the protein. The large subunit adds amino acids to the growing protein chain. They are found in both prokaryotic and eukaryotic cells. They can be found free-floating in the cytoplasm or attached to the endoplasmic reticulum. Ribosomes are responsible for protein synthesis, which converts genetic information into proteins and are essential for life, as proteins are necessary for all cellular functions.

Ribosomes – Diagram

Also Read: Difference Between 70s and 80s Ribosomes

Interesting Facts About Ribosomes

Some amazing facts about ribosomes are:

Fact – 1

Discovery of Ribosome: Ribosomes were first observed in the mid-1950s by Romanian-American cell biologist George Emil Palade. In 1974, Albert Claude, Christian de Duve, and George Emil Palade were jointly awarded the Nobel Prize in Physiology or Medicine for the discovery of the ribosome.

Fact – 2

Ribosomes are organelles: Ribosomes are small organelles that are responsible for protein synthesis in cells.

Also Read: RNA Translation

Fact – 3

Structure: They are composed of two subunits – the small subunit (SSU) and the large subunit (LSU) – which are made up of proteins and ribosomal RNA (rRNA).

Fact – 4

Abundance: Cells contain a large number of ribosomes. For instance, a typical human cell may have thousands to millions of ribosomes.

Fact – 5

Size: Ribosomes have different sizes in prokaryotic and eukaryotic cells. Prokaryotic ribosomes (found in bacteria) are smaller and are known as 70S ribosomes, whereas eukaryotic ribosomes are larger and exist as 80S ribosomes.

Also Read: Difference Between 70s and 80s Ribosomes

Fact – 6

Ribosomes are made of ribonucleic acid (RNA): The “rib” in ribosome comes from RNA, which provides instructions on making proteins.

Fact – 7

Ribosomes are different from most organelles: Ribosomes are different from most organelles in that they are not surrounded by a protective membrane.

Fact – 8

Ribosomes receive genetic information: Ribosomes receive genetic information from messenger RNA molecules, which are copies of the gene sequence.

Fact – 9

Ribosomes use messenger RNA as their guide: Ribosomes use messenger ribonucleic acids (mRNAs) as their guide and must “translate” the message contained in the nucleotides of mRNAs.

Fact – 10

Dynamic Nature: Ribosomes are not static structures; they can disassemble and reassemble as needed, allowing cells to regulate protein synthesis in response to the surrounding.

Fact – 11

Ribosomes attach to the endoplasmic reticulum: Ribosomes attach themselves to the surface of the ER via various membrane receptors. This attachment of ribosomes gives the characteristic rough appearance of the ER and thus is known as the Rough ER.

Fact – 12

Role in Disease: Ribosome dysfunction or mutations in ribosomal proteins or rRNA are associated with various human diseases, including certain types of cancer and genetic disorders known as ribosomopathies.

Fact – 13

Target of Antibiotics: Several antibiotics, such as tetracycline, erythromycin, and streptomycin, target bacterial ribosomes, inhibiting protein synthesis and thereby killing or inhibiting the growth of bacteria.

Fact – 14

Evolutionary Significance: Ribosomes are thought to be one of the most ancient molecular machines, dating back billions of years, indicating their critical role in the origin and evolution of life on Earth.

Fact – 15

Research Tool: Ribosomes and their components are extensively studied in molecular biology and biochemistry, serving as valuable tools for understanding fundamental cellular processes and developing new therapeutic interventions.

Ribosomes Functions

Ribosomes perform the following functions:

• Ribosomes assemble amino acids into polypeptide chains according to mRNA sequences.
• Ribosomes bind to mRNA and identify the start codon, initiating protein synthesis.
• They move along mRNA, adding amino acids to the growing polypeptide chain.
• Ribosomes recognize stop codons, terminating protein synthesis and releasing the newly formed protein.
• They assist in the proper folding of nascent polypeptides.
• Ribosomes associated with the endoplasmic reticulum direct proteins to their proper destinations.

Also Read: Protein Structure – Primary, Secondary, Tertiary, Quaternary

Conclusion: Facts About Ribosomes

Ribosomes, found in all living cells, are composed of small and large subunits made of proteins and ribosomal RNA. They are dynamic structures, found in abundance within cells and facilitates protein synthesis. In eukaryotic cells, ribosomes can be free-floating in the cytoplasm or associated with the endoplasmic reticulum. Dysfunction of ribosomes is linked to various diseases, and they are targeted by antibiotics. Their study is important for understanding cellular processes and developing therapies.

Also Read:

• Diagram of Ribosomes
• Difference Between Ribosomes and Lysosomes
• Cell Organelles – Structure, Types and their Functions
• Ribosomes and Inclusion Bodies

FAQs on Facts About Ribosomes

How Many Ribosomes are in a Cell?

The number of ribosomes in a cell depends on the type and activity of the cell. For example, a mammalian cell can have up to 10 million ribosomes, while liver cells can have up to 14 million. On the other hand, red blood cells do not contain any ribosomes.

What Has 70 Ribosomes?

70S ribosomes are found in prokaryotic cells, chloroplasts, and mitochondria.

Do Eukaryotes Have 30S Ribosomes?

No, eukaryotes do not have 30S ribosomes.

Where are Ribosomes Found?

Ribosomes are found in the cytoplasm on the surface of rough endoplasmic reticulum and attached to the cytosolic side of the ER membrane.

Are Ribosomes Found in the Smooth ER?

No, ribosomes are not found in the smooth endoplasmic reticulum (SER).

What is the Function of Ribosome?

The function of ribosomes is to synthesize proteins by translating the genetic information encoded in mRNA into amino acid sequences.

What are the Two Components of Ribosomes?

The two main components of ribosomes are the small and large ribosomal subunits. Each subunit contains one or more ribosomal RNA (rRNA) molecules and many ribosomal proteins (r-proteins).

What are the 5 Facts About Ribosomes?

Ribosomes are cellular structures responsible for protein synthesis, found in both prokaryotic and eukaryotic cells, containing RNA and proteins, involved in translating genetic information into proteins, and can be free-floating in the cytoplasm or attached to the endoplasmic reticulum.