Essays Tagged: "Spindle apparatus"

Organism reproduction with an emphasis on meiotic cell disivion

rther condense and the nucleoli disappear. The centromeres begin to migrate to opposite poles and a spindle apparatus begins to form between them. Then the nuclear envelope begins to break into partic ... During metaphase I the tetrads are aligned on the metaphase plate, halfway between the poles of the spindle. The spindle microtubules connect to the kinetochores at the centromeres of the sister chrom ...

(4 pages) 60 0 4.0 Feb/2003

Subjects: Science Essays > Biology

Test Essay on Cell Division, Anatomy & Physiology Dr. Mann.

and nucleolus disintegrate after passing their nucleic acids to certain pairs of chromatids. Now a spindle forms, this is also made out of microtubules.During Metaphase, the chromosomes move towards ... is also made out of microtubules.During Metaphase, the chromosomes move towards the equator of the spindle, attaching themselves horizontally by the centromere to the spindle's filaments. The chromat ...

(2 pages) 41 0 3.0 Oct/2003

Subjects: Science Essays > Biology

Bacterial Cell Replication and cell changes/stages summarized.

igns its chromosomes in the middle region of the cell. Centrioles at each pole of the cell send out spindle fibers that grasp each chromosome. The cell is preparing to separate the chromosomes.Anaphas ... preparing to separate the chromosomes.Anaphase. During anaphase the cell chromosomes are separated. Spindle fibers shorten so that the newly synthesized chromosomes (DNA) are pulled to one end of the ...

(4 pages) 59 1 2.8 Nov/2003

Subjects: Science Essays > Biology

Mitosis explanation, plain and simple....maybe write more about cytokinesis???

late prophase, the nuclear envelope disappears and the centrioles at the poles of the cell release spindles which will go to attach to the kinetochores, which are small specific regions of a centrome ... o the kinetochores, which are small specific regions of a centromere designed for attachment to the spindle apparatus.In metaphase, the centrioles are aligned with each other at the top and bottom of ...

(2 pages) 57 1 5.0 Nov/2003

Subjects: Science Essays > Biology > Human Biology


w, proteins called microtubules. The microtubules arrange themselves in the shape of a football, or spindle, that spans the cell, with the widest part at the center of the cell and the narrower ends a ... ell, with the widest part at the center of the cell and the narrower ends at opposite poles. As the spindle forms, the nuclear membrane breaks down into tiny sacs or vesicles that are dispersed in the ...

(4 pages) 60 0 3.7 Nov/2003

Subjects: Science Essays > Biology

This essay is about the process of mitosis. Which is the eukaryotic cells way of dividing and multiplying. Also a from of reproduction on a cellular level.

ntrosomes start to move to opposite poles, or the ends of the cell. The last thing to happen is the spindle microtubules extend and attach themselves to the centromeres, or to the middle of the chromo ... er of the cell.The second stage of mitosis is called metaphase. When the chromosomes, pulled by the spindle's microtubules, reach the center of the cell and line up along the middle of the cell this i ...

(3 pages) 52 0 0.0 Feb/2004

Subjects: Science Essays > Biology

Mitosis.Major Events Occurring During Mitosis and Cytokinesis.Include different phases of cell duplication.

zations. In all eukaryotic organisms, including fungi, plants and animals, a microtubule (MT)-based spindle apparatus is assembled and used for chromosome segregation. Similarly, cytokinesis results f ... of two sister chromatids that are held together along their lengths). The assembly of a bipolar MT spindle begins when the unique interphasic MT-organizing centre (MTOC) splits; these separate MTOCs ...

(2 pages) 52 0 3.8 Feb/2004

Subjects: Science Essays > Biotechnology

To investigate the effect of phosphate on cell division in root tips.

ible as they become shorter and thicker. Replicated centrioles move opposite poles of nucleus and a spindle is formed. Nuclear envelope and nucleolus disappear. Chromosomes become visible and the two ... ds are attached to each other at centromere.3. Metaphase, in this stage chromosomes are attached to spindle by centromeres and line up across the equator. Chromosome separates at the centromere and th ...

(4 pages) 52 0 4.2 May/2005

Subjects: Science Essays > Biology > Plant Biology


of the cell and fibers extend from the centromeres. Some fibers cross the cell to form the mitotic spindle.Prometaphase is when the nuclear membrane dissolves, marking the beginning of prometaphase. ... he kinetochores. Microtubules attach at the kinetochores and the chromosomes begin moving.Metaphase spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to ...

(2 pages) 41 0 4.3 May/2005

Subjects: Science Essays > Environmental Science

Cellular Reproduction.

his point chromosomes have formed into two chromatids separated by a structure called a centromere. Spindle fibers are barely visible. During metaphase, the second phase of mitosis, the two chromatids ... se of mitosis, the two chromatids line up along the equator of the cell. Each chromatid has its own spindle fiber. Next comes the third phase of mitosis, Anaphase, in which the centromeres break in ha ...

(2 pages) 39 1 3.6 Jan/2006

Subjects: Science Essays > Biology

Mitosis Description

ppear. Each duplicated chromosome appears as two identical sister chromatids join together. Mitotic spindle begins to form in cytoplasm (it is made of microtubules radiating from two centrosomes). Nex ... attached to microtubules coming from opposite poles of the cell. Entire apparatus of microtubules = spindle. In anaphase, sister chromatids separate from each other and move toward opposite ends of th ...

(1 pages) 21 0 3.0 Jan/2006

Subjects: Science Essays > Biotechnology

Describing the cell cycle and mitosis.

oken down into five stages: prophase, prometaphase, metaphase, anaphase, and telophase. The mitotic spindle, made of microtubules and associated proteins assemble and elongate. The assembly of spindle ... eus. The two centrosomes move apart from each other during prophase and prometaphase of mitosis, as spindle microtubules grow out from them. By the end of prometaphase, the two centrosomes, one at eac ...

(2 pages) 24 0 5.0 Feb/2006

Subjects: Science Essays > Biology

Mitosis 101

n the Centrioles are at opposite ends of the cells thread like structures come out from them called Spindles which begin to stretch across the cell towards each other. Metaphase is when I think things ... the cell towards each other. Metaphase is when I think things really begin to start happening, the spindle fibers connect and each chromosome lines up in the middle of the cell to get their own spind ...

(2 pages) 1272 0 0.0 Aug/2001

Subjects: Science Essays > Biology

Cell division in animals: mitosis, cytokinesis, and the cell cycle.

chromosomes have two sister chromatids that are bonded at a midpoint called the centromere. Mitotic spindles are also formed in the cells cytoplasm during prophase. In the later stages of the first st ... poles of the cell. In the centromere of each chromatid is a point called the kinetochore. Then the spindle microtubules attach to the kinetochore making the chromosomes move. The spindle microtubules ...

(2 pages) 10697 0 0.0 Feb/2008

Subjects: Science Essays > Biology

Chromosomal Chaos and Cancer

•Normal human cell•Aneuploid cell•Proteins and their role•The role of mitotic spindle apparatus•From normal to abnormal•Children and Cancer•CarcinogensSince 1960's ... he cell to produce abnormal amount of proteins that were encoded by those lost or multiplied genes. Spindle apparatus which has a major responsibility in cell division is a complex of proteins. This a ...

(3 pages) 9 0 0.0 Mar/2008

Subjects: Science Essays > Biology > Human Biology