Prokaryotic mRNA contains the message from the DNA that is utilized by the bacteria for the synthesis of two or more polypeptides. True
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Prokaryotic mRNA contains the message from the DNA that is utilized by the bacteria for the synthesis of two or more polypeptides.
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- False
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- The genetic code is defined as a series of _______________ in _______________. (a) anticodons; tRNA (b) codons; DNA (c) anticodons; mRNA (d) codons; mRNA (e) codons and anticodons; rRNAA certain mRNA strand has the following nucleotide sequence: 5AUGACGUAUAACUUU3 What is the anticodon for each codon? What is the amino acid sequence of the polypeptide? (Use Figure 13-5 to help answer this question.) Figure 13-5 The genetic code The genetic code specifies all possible combinations of the three bases that compose codons in mRNA. Of the 64 possible codons, 61 specify amino acids (see Figure 3-17 for an explanation of abbreviations). The codon AUG specifies the amino acid methionine and also signals the ribosome to initiate translation (start). Three codonsUAA, UGA, and UAGdo not specify amino acids; they terminate polypeptide synthesis (stop).Eukaryotic mRNA: usessnRNPs to cut out introns and seal together translatableexons. uses a spliceosome mechanism made of DNA to recognizeconsensus sequences to cut and splice. has a guanine cap on its 39 end and a poly(A) tail on its 59 end. is composed of adenine, thymine, guanine, and cytosine. codes the guanine cap and poly(A) tail from the DNAtemplate.
- Portions of eukaryotic mRNA sequence that are removed during RNA processing are . a. exons b. caps c. poly-A tails d. intronsPolypeptides can be reversed back to RNA because of the enzyme transcriptase. The genetic material must be replicated with high fidelity and great speed. Eukaryotic mRNA is said to be polycistronic since they encode multiple polypeptide chains RNA-synthesis occurs inside the nucleus while protein synthesis in the cytoplasm of eukaryotic organisms. Write T if the statement is true and write F if the statement is falseA mRNA sequence is shown below. Note that the coding strand of DNA has the same sequence as the mRNA, except that there are U’s in the mRNA where there are T’s in the DNA. The first triplet of nucleotides AAU (underlined) is in frame for coding, and encodes Asparagine. 45 50 55 60 65 5’—A A C G A A U C G U C G C C A A C U A A G A G –-3’ Which of the following DNA mutations is almost certain to result in a shorter than normal protein? at position 56 a change from G to C an insertion of a G after the G at position 56 inversion of region 56-59 (G C C A) an delete the C at position 52 None of the above.
- AKS 5c1: The model below represents the process of protein synthesis. What is the best description for what occurs during process A and process B in the model? * AA A GA TIT TT G CITG GCITAG |A AMGAA MAQ IB phenyl- alanine leucine alanine glycine methionineH iysine Process A is showing transcription, which uses a DNA template to create an mRNA copy of the genetic code. Process B is showing translation, which uses the MRNA to create a polypeptide chain. Process A is showing translation, which uses a DNA template to create an MRNA copy of the genetic code. Process B is showing transcription, which uses the MRNA to create a nolynentide chain ATBelow is the sequence of an mRNA that has just been transcribed. Please translate this sequence as if you were a ribosome, and write out the translation results. A genetic code table has been provided. mRNA: 5'- A C G U C C A A U G G C A G U G A U U U G A A U C C A -3'At least three types of RNA are required for protein synthesis. Compare and contrast mRNA, rRNA, and tRNA by moving the descriptions of their structure and function to the appropriate categories. Some phrases may describe all three types of RNA. mRNA in eukaryotes, can exist outside the nucleus acts as an enzyme for peptide synthesis composed of ribonucleic acid rRNA Answer Bank moves amino acids to the site of protein synthesis tRNA contains nucleotide triplets that code for specific amino acids has a convoluted structure with a three-base sequence called an anticodon moves genetic information out of the nucleus and into the cytoplasm mRNA, rRNA, and tRNA
- The following sequence is the coding strand of a piece of DNA. Type out the corresponding template strand of DNA and the MRNA that could be made from this piece of DNA if you assume that transcription begins at the first nucleotide listed. Next, use the attached genetic code table to translate the mRNA into a polypeptide that could be made from the message and list that sequence along with those of the DNA and MRNA. Coding strand 5'-TACCGTATGATTCTCTTGTATGGGTAACC-3' Second letter U UUU UUC UCU UAU UGU Phe Tyr Cys UCC UCA UAC UAA STOP UAG STOP UGG| Trp UGC Ser UUA UGA STOP A UUG Leu UCG CUU CCU CC CAU CGU CGC His CUC C CUA CAC САА Leu Pro Arg CCA CGA Gln CUG СCG CAG CGG AGU Ser AAU AAC ACU AUU lle AUC Asn ACC ACA AGC Thr AAA AGA AUA AUG Met Arg ACG AAG Lys AGG GAU GCU GCC GUU GGU Asp GAC GGC GGA GUC Val Ala Gly GCA GCG GAA GAG GUA Glu GUG GGG Third letter UCAG UCAG 5CAG UCAG First letterThe exact start site for protein synthesis on the mRNA is AUG and base pairs with a tRNA carrying the amino acid methionine. ture or falseShown below is the 5' end of an mRNA molecule. What are the first three (N-terminal) amino acids of its protein product? 5'-AUGUGUUGAUGUAUCAGACCUGUC ---
