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G7 science Ch3.3
Mitosis
Question | Answer |
---|---|
What are the three main stages of the cell cycle? | Interface, mitosis, Cytokinesis |
interphase | FIRST stage of cell cycle, period between two mitotic divisions during which the cell grows ,takes place before cell division occurs, cell copies its DNA. |
During what phase of cell cycle are organelles and enzymes produced? | early interface |
What is replication? | the process by which the cell makes a copy of its DNA in the nucleus before cell division |
What holds all the information the cell needs to carry out its functions? | DNA |
What is the thread like structure within the cell nucleus that contains DNA that is passed on from one generation to the next | Chromosome |
The end of replication, the cell contains ____ sets of chromosomes? | two identical |
In animal cells only (not plant cells), this structure is duplicated | centrioles |
What are centrioles | found only in animal cells, they are cylindrical cell structures that helps the cell divide |
mitosis | stage TWO of cell cycle, during which the cell’s nucleus divides into 2 new nuclei; one set of DNA is distributed into each daughter cell |
Cytokinesis | completes the process of cell division, final stage of cell cycle. cell cytoplasm divides and organelles distributed into daughter cells. |
What is difference between cytokinesis in animal and plant cell? | In animals, cell membrane squeezes together & organelles+cytoplasm divide in 1/2. Plants have a rigid wall, a cell plate forms in middle. the cell plate begins to form new cell membranes around daughter cells. Lastly cell walls form around cell membranes. |
What is the process of cell division that forms two new nuclei, each of which has the same number of chromosomes | mitosis |
Name the four parts of mitosis in order | prophase, metaphase, anaphase, telophase (PMAT) |
Explain prophase | 1st stage of mitosis; characterized by the condensing of the chromosomes + movement of centrioles to opposite sides of the cell + nuclear envelope breaks down+ spindle fibers form a bridge between the ends of the cell |
what stage of mitosis do spindle fibers form a bridge between the ends of the cell? | prophase |
what stage of mitosis does nuclear envelope break down? | prophase |
what stage of mitosis do centrioles move to opposite sides of cells? | prophase |
what stage of mitosis do chromosomes condense? | prophase |
Metaphase | second stage of mitosis during which each chromosome attaches to a spindle fiber at its centromere, and all of the chromosomes move to the cell's equator |
what stage of mitosis do attached to spindle fibers at centromere? | metaphase |
what stage of mitosis do chromosomes lineup at the cell’s equator? | metaphase |
anaphase | 3rd stage of mitosis; centromere splits and pulls chromatids apart (now called chromosomes since they separated). Chromosomes then drawn by spindle fibers to opposite ends of cell. Sell stretches out. |
what stage of mitosis do chromatids separate? | Anaphase |
what stage of mitosis does centromere split? | anaphase (recall centromere holds chromatids together) |
what stage of mitosis do chromosomes get drawn buy spindle fibers to opposite ends of cell? | anaphase |
what stage of mitosis does so stretch out? | anaphase |
telophase | the final stage of mitosis, during which a nuclear membrane forms around each set of new chromosomes |
what stage of mitosis does nuclear membrane forms around each new cell with Its new chromosomes | telophase |
T/F cytokinesis begins during mitosis | TRUE; Into daughter cells |
Chromatid | one of the two rod like parts of a chromosome, an EXACT copy of the other containing identical DNA |
Centromere | structure that holds chromatids together until they move apart later in mitosis |
When chromatids separate, they are called __________ | chromosomes |