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Dna, mutation tumours cancer

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hasanahatesscience's version from 2015-10-16 00:42

Section 1

Question Answer
mutation is whenpermanent change in the DNA sequence of a gene. causes changes in the way cell behaves
inherited means that if a parent has a mutation in his or her dna, mutation is passed on to his or her children. cannot change
acquiredthis happens when enviromental agents damage dna, when mistakes occur when a cell copies its dna prior to cell division
mutagensany chemical or physical agent that causes a change in dna
mutagens may also be carcinogensradiation, viruses, and chemicals
cancergroup of disorders that causes cells to escape normal controls on cell division
cancer cells divide more frequently
cancer cells are not inhibted by contactwith other cells and can form tumours
cancer cells can invade other tissuesa process called metatasis
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Section 2

Question Answer
benigndoes not spread to other cells. not harmful and can be removed
mulignantspreads to other areas of the body. very harmful
control of the cell cyclemechanisms for controlling progress through the cell cycle: 1.check points 2.length of telomeres 3.chemical signals from within and outside the cell
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Section 3

Question Answer
cause: mutation in gene that usually slows the cell cycleeffect: rate of cell division is accelerated
cause: failure to pause for dna repaireffect: faulty dna leads to unregulated cell growth
loss of control over telomere lengthcancer cells have telomerase, an enzyme that elongates telomeres. cell continues to divide after 50 MITOSES
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