choose the correct answer 35. When using a repeating trinucleotide sequence (suc
ID: 266456 • Letter: C
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choose the correct answer
35. When using a repeating trinucleotide sequence (such as 5'-AAC-3') in a cellfree translation system, you will obtain: a. three different types of peptides, each made up of a single amino acid b. peptides made up of three different amino acids in random order c. peptides made up of three different amino acids, each alternating with eac other in a repetitive fashion d. polyasparagine, as the codon for asparagine is AAC 36. An extraterrestrial organism (ET) is discovered whose basic cell biology seems pretty much the same as that of terrestrial organisms except that it uses a different code to translate RNA into protein. You set out to break the code by translation experiments using RNAs of known sequence and cell-free extracts of ET cells to supply the necessary protein-synthesizing machinery. In experiments using the RNAs below, genetic owing results were obtained when the 20 possible amino acids were added either singly or in different combinations of two or three RNA 1: 5'-GCGCGCGCGCGCGCGCGCGCGCGCGCGC-3' RNA 2:5'-GCCGCCGCCGCCGCCGCCGCCGCCGCCGCC-3' Using RNA 1, a polypeptide was produced only if alanine and valine were added to the reaction mixture. Using RNA 2, a polypeptide was produced only if leucine and serine and cysteine were added to the reaction mixture. Assuming that protein synthesis can start anywhere on the template, that the ET genetic code is nonoverlapping and linear, and that each codon is the same length (like the terrestrial triplet code), how many nucleotides does an ET codon contain? C. b. 3 d. 5 37. All the following statements regarding eukaryotic mRNA decay are TRUE except? Degradation of eukaryotic mRNA is initiated by the shortening of the 3' poly-A sequence Before mRNA can be degraded by an exonuclease in the 5' to 3' direction, it must be decapped by a decapping enzyme Exonucleolytic degradation of mRNA can only occur in the 3'to 5' direction Exonucleolytic degradation of mRNA can occur in either the 3' to 5' direction or the 5' to 3' direction None of the statements above are true a. b. c. d. e.Explanation / Answer
37 Answer:-D
Exolytic degradation of mRNA occur only in 3->5 direction.
35 Answer:-A
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