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PROBLEM 20 UAA is a stop codon. Why does the UAA sequence in mRNA in Problem 18 not cause pro- tein synthesis to stop?

PROBLEM 20 UAA is a stop codon. Why does the UAA sequence in mRNA in Problem 18 not cause pro- tein synthesis to stop?

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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PROBLEM 18• If methionine is the first amino acid incorporated into a heptapeptide, what is the sequence of the amino acids encoded for by the following stretch of mRNA? 5'-G-C-A-U-G-G-A-C-C-C-C-G-U-U-A-U- U-A-A-A-C-A-C-3' PROBLEM 19 Four C's occur in a row in the segment of mRNA in Problem 18. What polypeptide would be formed from the mRNA if one of the four C's were cut out of the strand? PROBLEM 20 UAA is a stop codon. Why does the UAA sequence in mRNA in Problem 18 not cause pro- tein synthesis to stop? PROBLEM 21 Write the sequences of bases in the sense strand of DNA that resulted in the mRNA in Problem 18. PROBLEM 22 List the possible codons on mRNA that specify each amino acid in Problem 18 and the an- ticodon on the tRNA that carries that amino acid.
Transcribed Image Text:PROBLEM 18• If methionine is the first amino acid incorporated into a heptapeptide, what is the sequence of the amino acids encoded for by the following stretch of mRNA? 5'-G-C-A-U-G-G-A-C-C-C-C-G-U-U-A-U- U-A-A-A-C-A-C-3' PROBLEM 19 Four C's occur in a row in the segment of mRNA in Problem 18. What polypeptide would be formed from the mRNA if one of the four C's were cut out of the strand? PROBLEM 20 UAA is a stop codon. Why does the UAA sequence in mRNA in Problem 18 not cause pro- tein synthesis to stop? PROBLEM 21 Write the sequences of bases in the sense strand of DNA that resulted in the mRNA in Problem 18. PROBLEM 22 List the possible codons on mRNA that specify each amino acid in Problem 18 and the an- ticodon on the tRNA that carries that amino acid.
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