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science l2c3 PG2
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| Question | Answer |
|---|---|
| Most cells in an organism go through a cycle of growth, development and division called the _________ . | cell cycle |
| Because of the cell cycle, organisms grow and ________________, replace old or damaged cells, and produce new cells. | develop |
| There are two main phases of the cell cycle-interphase and the _____________ phase. | Mitotic |
| _______________ is the period of growth and development for a cell. | Interphase |
| During interphase, most cells go through three stages-rapid growth and ____________ of the organelles; replication of ______________, the genetic information in a cell; and preparation for ________________. | replication(1) DNA(2) cell division(3) |
| During the mitotic phase, a cell ____________ . | divides |
| __________makes most of the cell cycle. | Interphase |
| During interphase, the DNA in the cell is called __________. | chromatin |
| Interphase begins with a period of rapid growth-the _______ stage. | G1 |
| During the _______ stage of interphase, the cell replicates its strands of chromatin. | S |
| _______________________ are the two identical strands of DNA that make up the duplicated chromosome. | Sister chromatids |
| Sister chromatids are held together by a structure called the ___________________. | centromere |
| The final stage of interphase-the ______ stage-is a period of growth and final preparation for the mitotic phase. | G2 |
| Before a cell divides, it makes copies of all its _______________. | contents |
| In ____________, the nucleus and its contents divide. | mitosis |
| In _______________, the cytoplasm and its contents divide. | cytokinesis |
| Two new ____________result from mitosis and cytokinesis. | cells |
| During __________, duplicated DNA condense into chromosomes. | prophase |
| During ___________, the chromosomes line up in the middle of the cell. | metaphase |
| During ____________, sister chromatids in each duplicated chromosome separate and are pulled in opposite directions by the spindle fibers. | anaphase |
| During ____________, chromosomes begin to uncoil, and two new identical nuclei form. | telophase |
| After mitosis, cytokinesis usually divides a cell’s cytoplasm, forming a new cell ________________ around each daughter cell. | membrane |
| In animal cells, a(n)_______________ in the middle of the cells gets deeper until the cell membrane comes together to divide the cell. | furrow |
| In plant cells, a(n) _______________ grows outward toward a new cell wall until two new cells form. | cell plate |
| The cell cycle results in two new ________ that are genetically identical to each other and to the original cell, which no longer exists. | cells |
| The cell cycle is important for reproduction in some organisms, growth ______________organisms, replacement of worn-out or damaged cells, and repair of damaged tissues. | multicellular |
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