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Centrioles are organelles involved in cell division. The function of centrioles is to help organize the chromosomes before cell division occurs so that each daughter cell has the correct number of chromosomes after the cell divides. Centrioles are found only in animal cells, and are located near the nucleus.
- Christine Miller
- 2020
As cells enter mitosis, their chromosomes become highly condensed so that they can be distributed to daughter cells. The loops of 30-nm chromatin fibers are thought to fold upon themselves further to form the compact metaphase chromosomes of mitotic cells, in which the DNA has been condensed nearly 10,000-fold ( Figure 4.12 ).
- Geoffrey M Cooper
- 2000
- 2000
Topic 3.3: The Interphase Nucleus—Structure, Function, and Protein Import. Discuss the relationship between the nuclear envelope and the endoplasmic reticulum. What is the functional role of the nuclear lamina? One of the key regulatory proteins that initiates the cell division process phosphorylates the proteins of the nuclear lamina.
Aug 18, 2000 · The mitotic spindle is a complex and fascinating macromolecular machine that performs a crucial task: distributing an exact complement of chromosomes to each daughter cell during mitosis or meiosis. It is composed primarily of microtubules, dynamic cytoskeletal polymers of α/β tubulin subunits with an intrinsic structural polarity. The polymer lattice serves as a track for microtubule-based ...
Proteins are the macromolecules that perform most cellular functions: they serve as building blocks for cellular structures and form the enzymes that catalyze all of the cell's chemical reactions (Chapter 3), they regulate gene expression (Chapter 7), and they enable cells to move (Chapter 16) and to communicate with each other (Chapter 15).
- Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter
- 2002
- 2002
Dec 26, 2014 · Cell division is the fundamental process by which two daughter cells are produced from a single progenitor. In animal cells, the site of cell cleavage to ‘cut’ the cell in two is specified during anaphase [1–3] by signals derived from the spindle midzone, which is formed between the separating chromosomes (Figure 1A) [4]. This mechanism coordinates chromosome segregation with cytokinesis ...
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How chromosomes are condensed during mitosis?
Which organelle organizes chromosomes before cell division?
What is the basic structure of chromosomes in eukaryotes?
Which chromosome is used in mitosis?
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Many cell types don’t divide evenly at mitosis. Lots of plant and animal cells undergo asymmetric division, which results in one daughter cell that is larger than the other. Additionally, lots of cells “grow” their daughter cell off of one side and move the new daughter nuclei into the bud once the bud is large enough.