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33 Cards in this Set
- Front
- Back
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how do many-called organisms grow?
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cell division
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how do one-celled organisms reproduce?
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cell division
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where is DNA found?
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in the nucleus
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when DNA copies, what breaks the bonds between the nitrogen bases?
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enzymes
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haploid numbers are found in what types of cells?
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sex cells
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what kind of cells constantly repeat the cell cycle?
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skin cells and body cells
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where is most of a eukaryotic cell's life spent?
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interphase
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which type of cells are always in interphase and no longer divide?
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nerve and muscle cells
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why do cells copy their hereditary material?
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so the 2 noew cells have a compete copy
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during interphase, what do chromosomes do?
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duplicate
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during what stage do the nucleolus and the nucleur membrane disintergrate?
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prophase
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plant cells don't have what?
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centrioles
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what happens after the nucleus divides?
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the cytoplasm seperates
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what does the appearance of a cell plate mean?
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the cytoplasm is being divided
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what happens after the cytoplasm divides?
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cells begin a period of growth, or interphase
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mitosis is the division of what?
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the nucleus
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what does mitosis produce?
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2 new nuclei that are identical
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after mitosis, what happens to the original cell?
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it no longer exists
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true of false? if an organism is produced through asexual reproduction, will it have identical hereditary material?
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true
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how does a bacteria reproduce?
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by fission
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why does bacteria reproduce by fission?
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because it has no nucleus
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what happens during fission?
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bacteria copies it's genetic material and then divides
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what is budding?
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asexual reproduction when a new organism grows from the body of the parent organism
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what is regeneration?
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process that uses mitosis and cell division to regrow body parts
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where are sex cells formed?
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reproductive organs
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what happens after fertilization?
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mitosis and cell division begins
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true or false? sex cells out number body cells
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false
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what does meiosis insure?
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the offspring will have the same diploid number as the parent
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what happens before meiosis?
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chromosomes duplicate
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what happens in metaphase II that does not happen in metaphase I?
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each centromere attaches to two spindle fibers instead of one
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after meiosis I and II take place, how many cells are there?
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four
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true or false? each call has one-half the number of chromosomes in its nucleus that were in the original nucleus
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true
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are mistakes in meiosis more common in plant or animal cells?
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plants
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