Biology

Biology, 20.09.2019 12:10, ramirez5571

Mutations always happen when dna has been damaged in some way. true or false?

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Biology, 02.08.2019 22:30, 200002977

Which of the following is not true about mutations? a) mutations are chance changes in the dna sequence of bases and may code for a different amino acid b) mutations may cause variations that are adaptations c) radiation and x-rays may cause mutations d) mutations are always harmful

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Biology, 25.08.2019 14:10, jacesmokesloud7254

All of the statements except one are true about mutations. which statement is false? a)mutations must be present in parents and then passed to offspring. b)mutations can be positive and produce organisms with improved traits. c)mutations can be fatal to the organism that has a mutation, if the mutation is in a critical gene. eliminate d)mutations can be silent, and not affect the organism that has them, if the mutation is in a non-critical area.

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Biology, 26.09.2019 08:30, chrisraptorofficial

Mutations always happen when dna has been damaged in some way. true or false?

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Biology, 02.11.2019 03:31, micahwilkerson8344

P53 is a protein that blocks the cell cycle if dna is damaged. it binds to cyclin and cdk, blocking entry into s phase. if the damage is severe, this protein can cause apoptosis or cell death. exposure to smoke, especially from smoking directly, is one of the most frequent causes of mutations to p53. when fluid from the lungs of smokers is analyzed, it often contains cells with p53 mutations. what is the most likely relationship between p53 mutation and the development of lung cancer? a) p53 mutations would cause more lung cells to die. b) p53 mutations would cause uncontrolled cell growth. c) p53 mutations would prevent damaged cells from dying. d) p53 mutations cause cells to enter m phase more frequently.

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