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76 Cards in this Set
- Front
- Back
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what makes up chromosome
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2 chromatid 1 centromere
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what produces the spindle
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centriole
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how do the asters differ in appearance from the spindle
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it's shorter
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when do the centrioles begin to move
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prophase
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do all life forms have centrioles
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no not plants
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how many chromatids in metaphase
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92
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what is the purpose of the spindle
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to move chromosomes
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furrow
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indentation
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plate
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becomes new cell wall, can't be indented because made of fiber
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where are the chromosomes in metaphase
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equator
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what happens to the chromosomes in anaphase
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go to the side
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why does mitosis occur
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so the nucleus can divide
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how many nuclei form in telephase
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2
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why does the nucleus appear so dark in prophase
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because chromatin are coiling into chromosome
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what structures disappear in prophase
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chromatin
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what makes the asters
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centrioles
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why do chromosomes become visible in prophase
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because chromatin condense, easier to split
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what do the chromosomes condense from
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chromatin
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when does DNA replicate
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interphase
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what assembles organic molecules in cell
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enzymes
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DNA replicates in
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synthesis
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extra organelles are made in
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G2
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when cell does most of its work
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G1
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Do ALL cells divide?
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no
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example of cell that doesn't divide
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skeletal muscle nerve
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mitosis
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division of nuclues
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cytokinesis
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splitting of the cytoplasm
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When cells divide what increases? decreases?
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Volume decreases, surface area ratio increase
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Cell division is also used for?
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cell growth and repair, production of certain proteins
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a form of asexual reproduction in which one cell makes two
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binary fission
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a segment of DNA that codes for a protein ot RNA molecule
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gene
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boat that holds DNA
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chromosomes
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2 exact copies of DNA that make up each chromosomes
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chromatid
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point at which chromatids attatch
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centromere
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a repeating sequence of cellular growth and division during the life of an organism
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cell cycle
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a repeating sequence of cellular growth division during the life of an organism
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cell cycle
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first three stage of cell cycle g1 s g2
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interphase
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how long does cell spend in interphase
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90%
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cancer causing genes
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oneogenes
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humans have how many chromosomes
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46
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when do DNA replicate
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interphase
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Four phases of mitosis?
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1. prophase
2. metaphase 3. anaphase 4. telephase |
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In prophase...
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chromatin condense into visible chromosomes
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ChromaTIN are seen when?
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interphase
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chromosomes are seen when?
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mitosis
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bodies the produce fibers in ANIMAL cells, replicate to move to opp. sides of cell
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centrioles
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long fibers
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spindle
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short spiky fibers
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asters
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What do chromosomes do in metaphase?
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line up @ equator
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In metaphase the spindle...
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stretches across cell attatches to centromeres
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a repeating sequence of cellular growth during the and division during the life of an organism
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cell cycle
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first three stage of cell cycle c1 s g2
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interphase
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how long does cell spend in interphase
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90%
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cancer causing genes
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oneogenes
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humans have how many chromosomes
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46
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when do DNA replicate
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interphase
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Four phases of mitosis?
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1. prophase
2. metaphase 3. anaphase 4. telephase |
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In prophase...
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chromatin condense into visible chromosomes
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ChromaTIN are seen when?
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interphase
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chromosomes are seen when?
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mitosis
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bodies the produce fibers in ANIMAL cells, replicate to move to opp. sides of cell
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centrioles
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long fibers
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spindle
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short spiky fibers
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asters
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What do chromosomes do in metaphase/
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line up @ equator
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In metaphase the spindle...
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stretches across cell attatches to centromeres
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What happens in anaphase?
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chromatids seperate at centromere pulled back by spindle to each poles
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What does telophase do?
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reverses prophase
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In telophase what disappears?
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spindles and asters
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What appears during telophase
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2 nuclear membrane and nucleoli
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What happens in telophase?
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chromosomes uncoil into chromatin, cytokinesis begins
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what assembles neeeded molecules, membrane and organelles
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enzymes
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Plants have no...
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centioles or asters
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another term for somatic cells
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body cells
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girl chromosome
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XX
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boy chromosome
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XY
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As a result of mitosis...
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each cell recieves exactly half chromosomes from cell
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