Chapter 9 vocabulary Cell Cycle Flashcards
The fourth stage of mitosis, in which the chromatids of each chromosome have separated and the daughter chromosomes are moving to the poles of the cell.
Anaphase
The requirement that a cell must be attached to a substratum in order to initiate cell division.
Anchorage Dependence
A radial array of short microtubules that extends from each centrosome toward the plasma membrane in an animal cell undergoing mitosis.
Aster
A mass of abnormal cells with specific genetic and cellular changes such that the cells are not capable of surviving at a new site and generally remain at the site of the tumor’s origin.
Benign Tumor
A method of asexual reproduction in a single-celled organisms in which the cell grows to roughly double its size and then divides into two cells. In prokaryotes, binary fission does not involve mitosis, but in single-celled eukarytoes that undergo binary fission, mitosis is part of the process.
Binary Fission
An ordered sequence of events in the life of a cell, from its origin in the division of a parent cell until its own division into two. The eukarytoic cell cycle is composed of interphase (including G1, S and G2 subphases) and M phase (including mitosis and cytokinesis).
Cell Cycle
A cyclically operating set of molecules in the eukaryotic cell that both triggers and coordinates key events in the cell cycle.
Cell Cycle Control system
The reproduction of cells
Cell Division
A membrane-bounded, flattened sac located at the midline of a dividing plant cell, inside which the new cell wall forms during cytokinesis.
Cell Plate
In a duplicated chromosome, the region on each sister chromatid where it is most closely attached to its sister chromatid by proteins that bind to specific DNA sequences; this close attachment causes a constriction in the condensed chromosome. (An uncondensed, unduplicated chromosome has a single centromere, identified by its DNA sequence.)
Centromere
A structure present in the cytoplasm of animal cells that functions as a microtuble-orgazing center and is important during cell division. An centrosome has two centrioles.
Centrosome
A control point in the cell cycle where stop and go-ahead signals can regulate the cycle.
Checkpoint
The complex of DNA and proteins that makes up eukarytoic chromosomes. When the cell is not dividing, chromatin exists in its dispersed form, as a mass of very long, thin fibers that are not visible with a light microscope.
Chromatin
A cellular structure consisting of one DNA molecule and associated protein molecules. (In some contexts, such as genome sequencing, the term may refer to the DNA alone.) A eukaryotic cell typically has multiple, linear chromosomes, which are located in the nucleus . A prokaryotic cell often has a single, circular chromosome, which is found in the nucleoid, a region that is not enclosed by a membrane. See also chromatin.
Chromosome
(1) The process of cytokinesis in animal cells, characterized by pinching of the plasma membrane. (2) The succession of rapid cell divisions without significant growth during early embryonic development that converts the zygote to a ball of cells.
Cleavage
