Xeroderma pigmentosa (XP): A. is caused by a defect in the mismatch repair system. B. typically results in base substitution mutations. C. can be caused by defects in any of a number of different genes that have to do with DNA repair. D. results when an individual does not spend enough time outside. E. Can be corrected by a direct repair mechanism

Unusually high levels of Mdr1 provide stem cells with a. Nutrients needed b. Protection of their genomes from mutagenic agents c. Apoptotic factors d. Ability to differentiate

Mutations can arise in the absence of a mutagen. please explain your answer  true false

How would each of the following types of mutations affect proteinfunction or the amount of functional protein that is expressed froma gene?A. Nonsense mutationB. Missense mutationC. Up promoter mutationD. Mutation that affects splicing

Exposure to various chemicals can cause DNA mutations. Classify the examples as representative of transition, transversion, or nsertion/deletion mutations. Transition replacement of T:A: with C:G treatment with nitrogen mustard causes this type of mutation oxidative deamination via nitrous acid causes this type of mutation treatment with 5-bromouracil causes the replacement of A:T with G:C Transversion replacement of G:C with T:A Answer Bank Insertion/Deletion the removal of one or more base pairs treatment with proflavin causes this type of mutation