2. Draw the chemical mechanism (with electron-pushing arrows) for the addition of anRNA nucleotide triphosphate to a growing mRNA transcript. Be sure to explicitlyshow the attacking nucleophile and the leaving group.

The process by which m RNA is synthesized from DNA is known as transcription. RNA polymerases are…

Answered: Draw the chemical mechanism (with…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter15: From Dna To Protein

Section: Chapter Questions

Problem 3TYK

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6. Indicate whether each of the following events occurs when tryptophan is high or when tryptophan is low by placing a check in each of the appropriate blanks. Share your reasoning. Tryptophan Tryp high Event Ribosome does not stall at Trp codons Region 2 of the leader pairs with region 3 Ribosome covers part of region 2 of leader Transcription is terminated before structural genes are transcribed
1. By use of a labeled diagram or a written description, distinguish the roles of thefollowing in elongation of a polypeptide: initiation complex, charged tRNAs, peptidyltransferase, Site A, Site P 2. What determines the initiation of translation? (Hint: there is more than one feature oftranslation.)
5. E. coli ribonuclease H1 is an enzyme that catalyzes the hydrolysis of phosphodiester bonds in RNA. Its proposed mechanism involves a 'carboxylate relay,' as shown below. His124 Asp70 || -HN-CH-C -HN-CH-C- CH2 CH2 c=0 RNA substrate HN H. H. (1) Fill the blanks. In the reaction scheme above, His124 acts as a ( ). The purpose of this relay system is to deprotonate the water molecule (II) so that it becomes a better ( :0
3. Draw the chemical mechanism (with electron-pushing arrows) for the first step of RNA splicing (as catalyzed by the splicosome). Be sure to explicitly show the attacking nucleophile, the phosphate at the intron-exon junction, the intron branch point and the leaving group in the reaction.
2. Several techniques were used to study the degree of translocation of truncated intermediates in the synthesis of an integral membrane protein (with a single transmembrane domain). Experiments were performed in the presence of SRP and canine pancreatic microsomes. The intermediates were synthesized using a rabbit reticulocyte translation system in the presence of 35S-methionine. Of the techniques used to monitor the progress of synthesis and translocation/insertion,| we are concerned with the following: Sedimentation: chains associated with the microsomes are found in the pellet of a 75,000 rpm ultracentrifuge spin. Crosslinks: a photoreactive phenylalanine derivative was incorporated into the truncated chain, and crosslinking to protein and lipid was analyzed after photo-activation. The intermediates studied using these approaches had between 40 and 154 amino acids. All truncated proteins with more than 60 amino acids sediment by centrifugation at neutral pH, while only…
8. The following diagram illustrates a step in the process of translation. fMet Pro mRNA UAC GGG AUGCCCACG UAG a) Identify the following elements on the diagram. Aminoacyl site (A) Peptidyl site (P) Exit site (E) Amino end of the newly synthesized polypeptide chain Carboxyl end of the newly synthesized polypeptide chain Approximate location of the next peptide bond that will be formed
1. A DNA base sequence transcribed into messenger RNA in the following sequence: TTATCTTCGGGAGAGAAAACA. a. If you read from left to right, what amino acids are coded by this sequence? (Note: The initiation sequence is disregarded in this example.) b. If proflavine treatment caused the deletion of the first adenine nucleotide on the left, describe the changes that would occur in the first six amino acids coded by this sequence?
3. Fill in the missing molecules or required cofactors. b) PLP @NH₂ 2 H₂N h) SH Joo NAD+ COASH TPP NAD+ FAD OH O H₂N of i h H₂N .OH НО. HO NH₂ NH₂ HO HO 4. Draw the branch point A nucleotide and all connected nucleotides of a canonical splice reaction after the A has carried out its nucleophilic attack on the 3' splice site.
Which of the following statements is false? a. GTP is an energy source during various stages of translation. b. In the ribosome, peptidyl transferase catalyzes peptide bondformation between amino acids. c. When the mRNA code UAA reaches the ribosome, there isno tRNA to bind to it. d. A long polypeptide is cut off the tRNA in the A site so its Metamino acid links to the amino acid in the P site. e. Forty-two amino acids of a protein are encoded by 126nucleotides of the mRNA.
14. Which mutation would be more harmful to a cell? For each predict the outcome of each mutation and explain one is worse than the other A) A mutation in the anticodon of Ala-tRNA from IGC to IGG OR a mutation in the alanyl tRNA synthase such that it adds either Ala or Ile to the appropriate tRNA? B) A mutation in bases 11 and 24 of the Ser-tRNA (both important recognition elements for serinyl tRNA synthase OR a mutation in the proofreading site of serinyl tRNA that inactivates proofreading
1. Considering the following nucleotide sequence in an mRNA molecule: 5’ AUG UUA CGU AAU GCU GUC GAA UCU AUU UGC UUU ACA UAA 3' a) Write the sequence of the DNA template (antisense) strand from which the mRNA was synthesized. b) Write the sequence of the DNA coding (sense or informational) strand complementary to the template strand. c) Write the sequence of tRNA anticodon that corresponds to the given mRNA molecule. d) Write the amino acid sequence of the peptide synthesized from the given mRNA nucleotide sequence. e) Draw the structure of the pertide fragment made up of the first five (5) amino acids in the given polypeptide.
6. Similar to the class notes (Intro to Genetics), a segment of DNA (shown below) contains a promoter segment (the first 9 base pairs), a ribosome binding segment (the next 6 base pairs), and a segment that codes for protein synthesis which is started by the rest of the base pairs. ACTCCATTGAACCATTTCTATGATCCGCTAACG-... TGAGGTAACTTGGTAAAGATACTAGGCGATTGC-... A. When the DNA is induced to be copied to mRNA, the top strand is coding, meaning that the mRNA makes an identical copy of the lower strand (replacing T with U) The mRNA copy starts with the ribosome binding sequence. What is the sequence of the mRNA that will go to the ribosomes? B. What are the first 6 amino acids of the protein that are coded for by the mRNA? C. What would the amino acid sequence be if... i. a transition mutation occurred on the final G in the mRNA? ii. all of the G & C bases in the protein synthesis portion had transition mutations? iii. a point deletion mutation occurred in the ATA sequence (in the lower strand…

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Draw the chemical mechanism (with electron-pushing arrows) for the addition of an RNA nucleotide triphosphate to a growing mRNA transcript. Be sure to explicitly show the attacking nucleophile and the leaving group.