Carlos and Matt were in science class studying friction. They began their investigation by pulling a block across their wood desk and recording the force needed to slide the block a distance of .5 meters. The boys hypothesized that is would take more force to pull the block across the desk if it were covered with cardboard. They repeated their original procedures, but with cardboard on the desk, under the block. To their surprise, the about of force to move the block .5 meters was the same! What would you tell the boys about their hypothesis and results? A) The hypothesis was incorrect and the design was flawed. B) The hypothesis was not a good one because it was not supported by their results. C) The hypothesis was not supported; the amount of force to move the block was the same on cardboard. D) The hypothesis was not supported; the boys should repeat the experiment until they get the results they predict.

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interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle