What is Karyosome in protozoa?
In protozoa other than ciliates, the nucleus is vesicular, with scattered chromatin giving a diffuse appearance to the nucleus, all nuclei in the individual organism appear alike. One type of vesicular nucleus contains a more or less central body, called an endosome or karyosome.
What are the three regions of the nucleus?
Plasma Membrane – The outer covering of the cell that encloses the cytoplasm. Cytoplasm – The jelly-like matrix within the cell that contains the various organelles. Nucleus – Round and usually centrally placed structure that controls the various activities of the cell.
What are the different parts of nucleus?
The nucleus is composed of various structures namely nuclear envelope, nucleoplasm or nucleus sap nuclear matrix, chromatin and nucleolus. The nuclear membrane forms an envelope like structure around the nuclear contents and is commonly known as a nuclear envelope.
What is karyosome and its function?
Karyosome refers to the chromatin material inside the cell nucleus when the cell is not undergoing meiotic division. It appears to be a dense mass in the middle of the cell and is often mistaken for the nucleolus. The karyosome or karyosphere is particularly known for its role in oogenesis.
What is called Karyolymph?
Nucleoplasm is also known as karyoplasm, karyolymph or nucleus sap. The soluble, liquid portion of the nucleoplasm is called the nucleosol or nuclear hyaloplasm.
What is Karyosome and its function?
What is a pore cell?
The nuclear pore is a protein-lined channel in the nuclear envelope that regulates the transportation of molecules between the nucleus and the cytoplasm. In eukaryotic cells, the nucleus is separated from the cytoplasm and surrounded by a nuclear envelope.
What is another name for Karyolymph?
Karyolymph. The presumably fluid substance or gel of the nucleus in which stainable elements were believed to be suspended; much that was formerly considered to be karyolymph is now known to be euchromatin. Synonym: nuclear hyaloplasm, nuclear sap, nucleochylema, nucleochyme.
What is the Karyoplasm?
Definitions of karyoplasm. the protoplasm that constitutes the nucleus of a cell. synonyms: nucleoplasm. type of: living substance, protoplasm. the substance of a living cell (including cytoplasm and nucleus)
Why nucleus is called brain of the cell?
The nucleus is like the remote control center of the cell. It acts as the cell’s brain by telling it what to do, how to grow, and when to reproduce. The nucleus is home to the cell’s genes. A membrane, a thin layer that allows chemicals to pass in and out to the rest of the cell, surrounds the nucleus.
What nucleus means?
A nucleus, as related to genomics, is the membrane-enclosed organelle within a cell that contains the chromosomes. An array of holes, or pores, in the nuclear membrane allows for the selective passage of certain molecules (such as proteins and nucleic acids) into and out of the nucleus.
How does a nuclear pore work?
Quick look:A nuclear pore is a minute opening or passage way through the nuclear envelope. It connects the nucleoplasm (nucleus) with the cytoplasm. The opening is ‘plugged’ with an amazing biological valve that only permits selected chemicals to move into and out of the nucleus.
What’s the function of nuclear pores?
The nuclear envelope is perforated with tiny holes known as nuclear pores, which were first discovered in the mid-twentieth century. These pores regulate the passage of molecules between the nucleus and cytoplasm, permitting some to pass through the membrane, but not others.
What is meant by Karyolymph?
/ (ˈkærɪəʊˌlɪmf) / noun. the liquid portion of the nucleus of a cell. GOOSES.
What is the Karyolymph?
The cytoplasm is an essential component of the cell. It is a semi-liquid jelly-like material, which joins the nucleus and the cell membrane. In the cell, the cytoplasm is embedded, while other cell organelles such as endoplasmic reticulum, mitochondria, ribosomes, vacuoles, etc.
What is the Hyaloplasm?
Hyaloplasm: the clear, semi-fluid material between the meshes of the cell reticulum.
What is the nuclear body associated with the karyosome?
The karyosome (ks) is associated with a huge nuclear body, presumptively the Cajal body (CB). Another type of nuclear bodies that has been initially discovered exactly in Drosophila somatic and germ cells ( Liu et al., 2006b) is the histone locus body (HLB).
Does the oocyte nucleus of somatic cells have a karyosphere?
If the nucleus of somatic cells is a very complex entity, then the oocyte nucleus is much more complicated. The existence of a karyosphere or karyosome is the most striking but still enigmatic morphological feature of the oocyte nucleus (germinal vesicle) at the diplotene stage of meiotic prophase.
What is the difference between chromatin and karyosome?
In an earlier stage of the oocytes growth, before karyosome formation, chromatin occupies the nucleus almost entirely, except for the area where the nucleolus is situated. However later, while a karyosome appears, all of the chromosomes are placed within the karyosome.
Where is the karyosome in Drosophila?
After staining with a DNA fluorescent dye (DAPI, Hoechst), karyosome appears as a spherical compact spot located in the center of the oocyte nucleus. An ultrastructural study ( Liu et al., 2006a) confirmed the absence of a capsule surrounding the Drosophila karyosome.