62. What phenotype would you expect to see in a strain of E coli with an inactiv
ID: 268935 • Letter: 6
Question
62. What phenotype would you expect to see in a strain of E coli with an inactivating mutation in the mutH gene? a. decrease in UV-induced mutations b. increase in UV-induced mutations c. increase in mismatch mutations d. increase in the methylation of nucleotide bases e. decrease in the methylation of nucleotide bases 63. You want to design a drug that prevents transcription of mRNAs in mammals but does not affect transcription of other RNAs. What enzyme would you target? a. RNA polymerase I b. RNA polymerase II c. RNA polymerase III d. rbozyme e. methyl transferase 64. An X-linked homozygous color-blind (a recessive disorder) woman gives birth to a son wheo is not color-blind. He could have normal vision because he a. has Down syndrome b. has Klinefelter syndrome c. has Turner syndrome d. has Jacob syndrome e. shows triploidy 65. Being an avid gardener (and a lover of your mom's zucchini bread), you do a cross between two pure-breeding strains of zucchini to see what will happen. One strain has green fruit, the other has yellow fruit. The F1 plants of your cross are all green, but when the FI's are crossed to each other, the F2 plants consist of 9 green to 7 yellow. What do all of these results collectively suggest to you? a. There is one gene that controls zucchini color just like there was one gene for seed color in Mendel's peas b. There are two genes for zucchini color and they are interacting with one another in some way c. There are three genes for zucchini color, the third one is being masked by the other two genes so only two colors showed up in your crosses. d. Who knows? This is not at all what you were expecting and there is no way to figure out what is going on.Explanation / Answer
Ans 62) C. increase in mis-match mutation.
expliain- MutH is responsible for repairing DNA by cleavage of the mis-match bases in DNA. If this protein is inactive then there will be increase in mismatch repair.
Ans 63) B. RNA Polymerase II.
Explain- RNA Polymerase II is responsible for transcription inhibition of mRNA.
Ans 64) D. Jacob syndrome
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.