12) In the lac operon, if lactose is present, which of the following occurster a
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12) In the lac operon, if lactose is present, which of the following occurster and transcribes s to the promoter transcribes A) Lactose bind to RNA polymerase, which then bind 12) the needed genes. B) Lactose binds to the repressor, changing its shape so that it does not bind to the operator. RNA polymerase then transcribes the needed genes. C) Lactose binds to the operon, which attracts RNA polymerase, then trn transcription of the needed genes occurs. D) Lactose bind s to the repressor, changing its shape so that it can bind to the operator and the structural genes are not expressed 13) All of these are true about the genetic code EXCEPT 13) A) It was cracked through the use of a cell-free system of enzymes. B) Most amino acids have only one codon. C) It produces 64 different possibilities of base sequences D) It is composed of a triplet code of three bases per codon. E) It contains start and stop codons as instructions 14) 14) Your tongue does not grow hair because A) saliva prevents hair from growing. B) the genes for hair proteins have been deleted from the cells of your tongue. C) skin cells have extra DNA that codes for hair proteins. D) different genes are expressed in different tissues. E) None of the above are correct 15) Which sequence of events is most CORRECT for the initiation and elongation steps of tra 15) in prokaryotic cells? A. initiator tRNA binds start codon on mRNA B. small ribosomal subunit binds to mRNA C. large ribosomal subunit binds D. tRNA entry and peptidyl transfer reaction E. translocation of ribosome and release of tRNA A) A, B, C, D, E ?) B, C, A, E, D C) A, C, B, D, E D) B, A, C, D, E E) A, B, C, E, D are to translation. 16) is to transcription as A) DNA polymerase; RNA polymerase B) DNA polymerase; ribosomes C) RNA polymerase; ribosomes D) RNA spliceosome; ribosomes E) RNA polymerase; RNA spliceosomesExplanation / Answer
1. Lactose bind to the repressor, changing its shapes that it does not bind to the operator. RNA polymerase then transcribes the needed genes.
2. Most amino acid have only one codon
3. Different genes are expressed in different tissue
4. B, A, C, D, E
5. RNA polymerise, ribosome
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