2. Using the standard 3.6 amino acids per turn (360°) and the helical wheel below, plot each sequence on a helical wheel. Circle the hydrophobic residues and draw a square around the hydrophilic residues. Clearly indicate which of the 4 sequences creates an amphipathic helix where one side is buried on the inside of the protein and the other is exposed to water. Explain why the peptide you chose is the correct one and why the other 3 are incorrect. CRAAPNRKIVLETY SIEPDANFRACISLW EKATVEMAVRNSA RAIMEILKVDAQFN

2. Using the standard 3.6 amino acids per turn (360°) and the helical wheel below, plot each sequence on a helical wheel. Circle the hydrophobic residues and draw a square around the hydrophilic residues. Clearly indicate which of the 4 sequences creates an amphipathic helix where one side is buried on the inside of the protein and the other is exposed to water. Explain why the peptide you chose is the correct one and why the other 3 are incorrect. CRAAPNRKIVLETY SIEPDANFRACISLW EKATVEMAVRNSA RAIMEILKVDAQFN

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter15: Genes And Proteins

Section: Chapter Questions

Problem 4RQ: The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains...

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1. Use the info of this molecule as well as the attached addendum to demonstrate the flow of genetic information to protein sequence as described by the so-called “Central Dogma” . Clearly indicate the direction of your polynucleotide strands and peptide/protein. ATG GCA TGC AAT AGC TCA TGC 2. What would happen to the amino acid sequence if the underlined nucleotide (C) would change to an A?
1) what is the net charge of the amino acid leucine of it is on the C-terminus end and why? 2) if the amino acid was changed to lysine on the c-terminus end explain why and what the net charge would be?.
6. a.) Which part (sugar, phosphate, or nitrogenous base) of the four types of nucleotides differ? b.) Based on the complementary base pairing rules we know that: A(denosine) pairs with _________ , and that G(uanine) pairs with _________.
6a) Transcribe the following DNA sequence into codons. TACGCGACATTACATGAATCGTTTGGAGATTAGCCCTATTTCTCTAAGAACACGACTb) Excise(cut out) codons numbered 5, 6, and 7. Leave the remaining codons. c) Now translate the sequence . d) Explain how many amino acids are now in your polypeptide? e) What would happen to your polypeptide if either of your cysteine amino acids near the start or end of thepolypeptide were translated incorrectly. f) Based on your final polypeptide can you make the original DNA strand by doing reverse translation andtranscription? g) Explain if your polypeptide similar to your template strand or the complementary strand?
1. For each of the sequences given below, list what type of secondary structural element, if any is most likely to be formed by that amino acid sequence. 1a. SEGEWQLVLHVWA 1b. GKGPPGPPGPRGPC 1c. CHSRHPGDFSC 1d. ASVRMNLGF
3 components of a nucleotide are randomly connected, how many different arrangements of those compounds are possible? Explain
1. What is the name of the nucleotide shown here?2. Identify all pointed structures (A to H)3. Which structure causes the acidity of the nucleotide? Choose theletter of your answer.
1. What is the length in AA’s of the LilP protein? Assume fMet is NOT CLEAVED. 2. Write out the sequence of the polypeptide in AA: use the three letter notation, e.g. Met-Ser-Pro-
1 the overall structure of DNA is double helical and the bases between each strand form watson- crick base pairs. why does RNA make such different structure give atleast two examples. 2Draw a generic triacylgylcerol. Use R for the alkyl groups.
5’ - A T G G C C C A A C T G A C C - 3’ a. How many nucleotides are listed here b. How many codons are listed here c. What are the three structural components of one nucleotide D.Write the appropriate sequence for the complementary strand above or below the sequence shown. Be sure to include which end of the complementary strand is 5’ and which end is 3 E.If the above sequence is the coding strand, write the RNA strand that will be transcribed
3. In studying normal and mutant forms of a particularhuman enzyme, a geneticist came across a particularly interesting mutant form of the enzyme. Thenormal enzyme is 227 amino acids long, but themutant form was 312 amino acids long. The extra85 amino acids occurred as a block in the middleof the normal sequence. The inserted amino acidsdo not correspond in any way to the normal proteinsequence. What are possible explanations forthis phenomenon? How would you distinguishamong them?
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' 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.