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| The cell cycle is an orderly set of stages that takes place between the time a ______ cell divides and he time the resulting_____cell also divide. |
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| What three things happen when a cell is going to divide? |
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| it grows larger, the number of organelles doubles, and the amount of DNA doubles |
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| What are the two portions of the cell cycle? |
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| MOst of the cell cycle is spent in _____. |
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| What types of cells typically do not complete the cell cycle? |
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| When cells do not complete the cell cycle and are permanently arrested, they are said to have entered a ____ stage. |
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| 90 % of the cell cycle would be what duration of time? |
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| What are the three stages of interphase? |
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| During g 1, the cell recovers from _____. Then the cell _____in size; doubles its _____, and accumulates materials that will be used for _____. |
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Definition
| previous division, increases, organelles, dna synthesis |
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| During the S stage, _____or____occurs. |
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Definition
| DNA synthesis or replication |
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| At the beginning of the S stage, each chromosome is composed of one ______. |
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| What is each double helix called? |
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| During the g 2 stage, the cell synthesizes ______that will assist in cell division. |
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| What does the M in the m stage represent? |
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| division of the cytoplasm |
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| Following interphase, the cell enters the ____. |
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| During mitosis, what happens? |
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| daughter chromosomes are distributed to two daughter nuclei |
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| When division of the cytoplasm is complete, _____are present. |
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| Whe cell cycle is controlled by _____. |
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Definition
| interal and external signals |
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| A_____is a molecule that stimulates or inhibits a metabolic event. |
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| _____are external signals received at the plasma membrane. |
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| Researchers have identified a family of internal signaling proteins called______that increase and decrease as teh cell cycle continues. |
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| What has to be present in order for the cell to proceed from the g 2 stage to the m stage and for the cell to proceed from the g 1 stage to the s stage. |
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| The cell cycle stops at the _____if dna has not finished replicating. |
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| _____is often defined as programmed cell death because the cell progresses through a usual series of events that bring about its destruction. |
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| Cell division increases and apoptosis decreases the number of ____. |
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