What is the function of a Polyribosome?

Polyribosomes attached to the endoplasmic reticulum synthesize proteins for export from the cell (e.g., digestive enzymes) and for placement within the plasma membrane (e.g., ion channel proteins).

What is Polysome and what is its function?

A polyribosome (or polysome or ergosome) is a group of ribosomes bound to an mRNA molecule like “beads” on a “thread”. The ability of multiple ribosomes to function on an mRNA molecule explains the limited abundance of mRNA in the cell. …

Do mitochondria polysomes?

A technique has been described for the isolation of intact mitochondrial polysomes which are active in protein synthesis. Mitochondrial ribosomes, derived from the polysomes, are of 71S particles and have 32S and 50S subunits.

What do the ribosomes in mitochondria do?

Mitochondrial ribosomes (mitoribosomes) perform protein synthesis inside mitochondria, the organelles responsible for energy conversion and adenosine triphosphate production in eukaryotic cells.

What is the role of elf4e in Polysomal translation?

Eukaryotic initiation factor eIF4E plays a pivotal role in translation initiation. As a component of the ternary eIF4F complex, eIF4E interacts with the mRNA cap structure to facilitate recruitment of the 40S ribosomal subunit onto mRNA.

Which of the following defines polysome?

7. Which of the following statement is defines polysomes? Explanation: Polysome is also known as polyribosome, it is a structure where a single mRNA holds a number of ribosomes translocating in 5′ to 3′ direction.

What is the function of polysome class 11th?

The function of polysomes is the formation of several copies of a particular polypeptide during protein synthesis.

What is a polysome in biology?

Polysomes are aggregates of numerous ribosomes that are in the process of actively translating mRNA into protein. By light microscopy polysomes appear as basophilic cytoplasmic granules, but are extremely labile during postmortem change in the liver.

Which of the following statement defines Polysomes?

Where are the vast majority of mitochondrial proteins synthesized?

mitochondria
Still, the vast majority of mitochondrial proteins are synthesized from nuclear genes and transported into the mitochondria. These include the enzymes required for the citric acid cycle, the proteins involved in DNA replication and transcription, and ribosomal proteins.

Why is the ribosome important?

A ribosome is a complex macromolecular structure in the cell which is involved in the process of translation. This is an essential function of all living cells, allowing for the production of proteins and all manner of biological structures.

How do ribosomes and mitochondria work together?

Ribosomes are the site of protein synthesis. Mitochondrial ribosomes synthesise proteins in the mitochondria, which are regulated by genes present in the mtDNA. They synthesise 13 mitochondrial proteins, required for oxidative phosphorylation.