Q. What are spindles made from?
Spindles are made primarily of microtubules that have a natural polarity. One end of a polymerized microtubule is known as the plus end, since new tubulin subunits tend to be incorporated there, and the other end is known as the minus end.
Q. What is spindle fiber formation?
Spindle fibers form a protein structure that divides the genetic material in a cell. Long protein fibers called microtubules extend from the centrioles in all possible directions, forming what is called a spindle. …
Q. What do spindle fibers attach to?
centromere
Q. What phase do spindle fibers disappear?
telophase
Q. What phase do spindle fibers attach to kinetochores?
In prophase, the nucleolus disappears and chromosomes condense and become visible. In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber.
Q. Do you see spindle fibers in interphase?
‘ There is interphase, prophase, prometaphase, metaphase, anaphase, telophase, and finally cytokinesis. Spindle fibers essentially exist during most of cell division. They form and exist through nearly all of the different phases.
Q. What is produced in the nucleolus?
The nucleolus makes ribosomal subunits from proteins and ribosomal RNA, also known as rRNA. It then sends the subunits out to the rest of the cell where they combine into complete ribosomes. Ribosomes make proteins; therefore, the nucleolus plays a vital role in making proteins in the cell.
Q. What is the other name of Nucleoplasm?
Similar to the cytoplasm of a cell, the nucleus contains nucleoplasm, also known as karyoplasm, or karyolymph or nucleus sap. The nucleoplasm is a type of protoplasm, and is enveloped by the nuclear envelope (also known as the nuclear membrane). The nucleoplasm includes the chromosomes and nucleolus.
Q. Where is the nucleolus formed?
Nucleoli. Nucleoli are small basophilic spherical bodies located in the nucleus. Usually they can be found in the central nuclear region but may also be close to the nuclear membrane. A nucleolus is built by a nucleolus organizing region (NOR) of a specific chromosome.
