Jumpto... 3/22/2018 09:30 AM 63.3/100 3/19/2018 04:28 PM BGradebook Question 21
ID: 212576 • Letter: J
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Jumpto... 3/22/2018 09:30 AM 63.3/100 3/19/2018 04:28 PM BGradebook Question 21 of 31 Incorrectincorrect ncorrectIncarrect Genetics: A Conceptual Approach 6th Edátion MHE/Freeman Map What would be the most likely effect on the transcription of the tp structural genes for the following mutations? mutation that prevents ribosome binding to the mRNA 5 UTR mutation that changes region 1 tryptophan codons into alanine codons mutation that creates a stop codon in region 1 of mRNA 5 UTR deletions in region 2 of the mRNA 5 UTR deletions in region 3 of the mRNA 5 UTR letions in region 4 of the mRNA 5UTR deletion of the string of adenine after region 4 of the mRNA 5 UTR Preve us check Answer 0 Next Ex 19 8 4Explanation / Answer
A mutation that changes the tryptophan codons in region 1 of the mRNA 5'UTR into codons for alanine; The tryptophan codons are required in region 1 as this makes the ribosome pause so that 2 and 3 can bind. If they now code for alanine, the ribosome will not pause, 1 & 2 will bind and 3 & 4 will bind causing attenuation. transcription occurs when alanine low. A mutation that creates a stop codon early in region 1 of the mRNA 5' UTR; The ribosome would stop when the first two will bind and the binding of second two would cause attenuation as 3 and 4 form the attenuator. transcription will not occur. Deletions in region 2 of the mRNA 5' UTR; If 2 is deleted, then 2 and 3 can't bind and so attenuation will happen.transcription will not occur Deletions in region 3 or 4 of the mRNA 5' UTR; Region 3 wouldn't be able to join with region 4 generating the attenuation factor, transcription would continue Deletion of the string of adenine nucleotides that follows region 4 in the 5' UTR; The string of adenine nucleotides is Expected for the attenuation hairpin to work as a terminator. So if they are removed transcription would continue
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