1.Write out the DNA sequence that marks the end of RNA transcription. Enkephalin
ID: 96275 • Letter: 1
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1.Write out the DNA sequence that marks the end of RNA transcription. Enkephalin is a small the template strand of DNA that codes for the synthesis of enkephalin is given below. Assume that transcription begins with the first codon following the TATA promoter sequence hormone in the brain that affects the perception of pain. The gene on 3'... TATA promoter TGT CACTAC ATO CCA CCC AAG ACT GAT TOG AAAAAAAA.. I. Write out the DNA sequence that marks the end of RNA transcription 2. In the blank below, write out tdhe mRNA codon sequence that would be transcribed from this DNA strand. Label 3 and 5' ends appropriately 3. Translation does not begin until a certain mRNA codon is read by the ribosome. Which mRNA codon is the "start" codon for translation? For which amino acid does the "start" codon code? Which DNA codon on the template strand codes for the "start" mRNA codon?-- 4. Translation stops when the ribosome reads any one of three mRNA codons Which of the three mRNA "stop" codons is found on the gene above? For which amino acid does this "stop" codon code? What are the other two mRNA-stop-codons? For which amino acids do these "stop codons code? 5. In the blank below, write out the amino acid sequence of enkephalin by translating the mRNA codon sequence in part 2 above. Refer to the "mRNA dictionary, Fig. 17.5 on page 339 of your textbook. Take into account your answer in parts 3 and 4 above to provide clues where the amino acid sequence begins and ends 6. In the blank below, write out the anticodon sequence of each tRNA that caries these amino acids to the ribosomes so that enkephalin can be assembledExplanation / Answer
1) The DNA sequences,upstream to poly A chain that is rich in GC bases mark the end of transcription.
2)mRNA codon sequence is
5"-ACA GUG AUG UAC GGU GGG UUC UGA CUA ACC UUUUUUUU 3"
m RNA formation occurs from 5" to 3" direction.
This is catalysed by RNA polymerase enzyme. The base pairing occurs between Adenine and Uracil and Guanine and cytosine
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