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25 Cards in this Set
- Front
- Back
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Why is cell division important?
(two reasons) |
1. Increases the total number of cells in an organism
2. It is how one celled organisms reproduce |
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Is the cell cycle time the same for all organisms?
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No
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What is the longest process in the cell cycle?
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Interphase
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Cells in the body that no longer divide are always in what state?
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Interphase
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At the end of interphase how many chromosomes are there if it started with 46?
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92 chromosomes
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What are chromosomes in interphase called?
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Cromatin which are proteins
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After interphase what occurs?
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Cell division
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What is mitosis?
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The process in which the nucleus divides to form two identical nuclei.
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List the steps of mitosis in order.
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Prophase, Metaphase, Anaphase, Telophase
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What contains the heredity material?
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The chromosomes
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Where are the chromosomes located?
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The nucleus
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What are chromatids?
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Two identical strands of chromosome coils
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What happens in prophase?
(3 things) |
~ the nucleolus and nuclear membrane disintegrate
~ centrioles move to the opposite ends of the cell ~ Spindle fibers begin to stretch across the cell |
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What happens in metaphase?
(2 things) |
~ pairs of chromatids line up across the center of the cell
~ the centromere of each chromatid becomes attached to the spindle fibers |
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What happens in anaphase?
(2 things) |
~ each centromere divides and the spindle fibers shorten
~ the chromatids separate and begin to move to opposite ends of the cell |
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What are separated chromatids called?
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Chromosomes
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What happens in telophase?
(2 things) |
~ spindle fibers start to disappear
~ New nucleus forms |
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What is cytokinesis?
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when the cell splits and there are two cells with each with 46 chromosomes
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What happens in asexual reproduction?
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a new organism is produced from one organism
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Organisms with eukaryotic cells asexually reproduce by what?
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Cell Division
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If something doesn't have a nucleus can it use mitosis?
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No
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How do bacteria reproduce?
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By Fission
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What happens in fission?
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An organism whose cells do not contain a nucleus copies its materials then divides it into two identical organisms
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What is budding?
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A type of asexual reproduction made possible because of cell division. When the bud on the adult becomes large enough, it breaks away to live on its own.
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What is regeneration?
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Is the process that uses cell division to regrow body parts.
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