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interphase: phases G1,S,G2
* the cell prepares for division
* the cell size increases
* dna is copied
what are the two main phases of cell cycle?
mitosis and interphase
during the cell cycle what occurs to the cell during interphase stage?
the cell grows and dna in the cell is copied
interphase G1:
- rapid cell growth
- preparation for dna replication
- possible entry into G0, a resting phase
interphase s:
- dna replication
- chromosome duplication to prepare for division
interphase G2:
- The cell ensures dna and other components duplicated properly
- this is the last chance for cell growth before division
cell cycle mitosis:
- a period of cell division
- produces two daughter cells
* own nucleus
which phases of cell cyle are part of interphase?
- gap phase 1
- gap phase 2
- s phase
what are the two main stages of the cell cycle?
- mitosis
- interphase
what occurs during the s phase of the cell cyle?
- dna replication
what occurs during mitosis ?
cell division to create two daughter cells
important of cell cycle to oranisms?
- growth
- repair
reproduction
burn victims:
* when skin is burned, cells must replace damaged skin cells to make new skin
* third degree burns cause damage to all layers of the skin and may cause nerve damage
* grafts are needed to protect and heal third degree burns
skin grafting:
* doctors use healthy skin from the burn victims body to cover the burned area
* as cells multiply they cover the graft with new layers of skin
* graft types are decided based on the damage to the skin
communication of cells:
- cells communicate with one another through chemical signals
-chemical signals are created by the dna of each cell
changes in dna:
- changes in dna cause chemical signals to change as well
- the results of this change may include; death of the cell, mutation, uncontrolled dividing of the cell
mutation:
what happens to the communication between cells if a mutation occurs?
- no change'
- positive change
- negative change
the cell cycle now produces cells with a mutation
cancerous cells:
- cancerous cells continue to divide without stopping
- masses of tissue called tumors are created
- tumors steal nutrients from normal cells
- cancer spreads
* via the circulatory system
* by touching organs or tissues '
what occurs when dna is copied incorrectly during interphase?
a mutation occurs
what is the effect of a mutaton?
positive and negative change
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