What process occurs in the nucleolus?
What process occurs in the nucleolus?
The most prominent substructure within the nucleus is the nucleolus (see Figure 8.1), which is the site of rRNA transcription and processing, and of ribosome assembly. As discussed in the preceding chapter, cells require large numbers of ribosomes to meet their needs for protein synthesis.
Does the nucleolus contain RNA?
Within the cell nucleus there’s a very specific part called the nucleolus. This does not contain the chromosomes. These RNAs, like the other messenger RNAs, are made in the nucleus, but ribosomal RNAs are made in the nucleolus which is a very specific part of the cell nucleus.
What happens in the Nucleoplasm?
Inside the nuclear membrane is the nucleoplasm, which main function is to store DNA and facilitate an isolated environment where controlled transcription and gene regulation is enabled. The nucleoplasm contains several non-membrane bound substructures,such as nuclear bodies and nuclear speckles.
What is the benefit of a double membrane?
The double membrane of the autophagosome serves an important function in the self-digestion process, as the outer membrane has to fuse with a lysosome containing digestive enzymes, which then degrade the inner lipid membrane of the autophagosome.
Which is covered by a double membrane?
Chloroplasts
Is the nucleolus single membrane bound?
No, it has no membrane of its own. It is a region within the nucleus where ribosomal subunits are produced. There are sometimes two or more nucleoli within a nucleus.
Is nucleolus single or double membrane?
Nucleolus is bounded by double membrane.
Is Er single or double membrane?
Single membrane-bound organelles: Vacuole, Lysosome, Golgi Apparatus, Endoplasmic Reticulum are single membrane-bound organelles present only in a eukaryotic cell. Double membrane-bound organelles: Nucleus, mitochondria and chloroplast are double membrane-bound organelles present only in a eukaryotic cell.
What is the only organelle that is not bound or made of membranes?
ribosomes
Which cell organelle does not have a membrane?
The nucleolus, the largest and most prominent compartment lacking a membrane, is found in the nucleus of almost all cells. First described nearly 200 years ago, this globular structure is now known to play critical roles in ribosome formation.