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- Question 1Predicting Secondary Structure Which of the following peptides is more likely to take up an -helical structure, and why? (a) LKAENDEAARAMSEA (b) CRAGGFPWDQPGTSNQUESTION 22 The DNA sequences that are most conserved between human and mouse would most likely be located in: A Highly-repeated sequences, such as microsatellite regions B Highly repeated sequences, such as Alu sequences C Moderately-repeated non-coding sequences D Coding regions of single-copy genesQUESTION NO. 1Targeting a protein to be degraded within proteasomes usually requires ubiquitin. In the function of ubiquitin all of the following are true except: A. ATP is required for activation of ubiquicin. B. a peptide bond forms between the carboxyl terminal of ubiquitin and an ε-amino group of a lysine . C. linkage of a protein to ubiquitin does not always mark it for degradation. D. the N-terminal amino acid is one determinant of selection for degradation. E. ATP is required by the enzyme that transfers the ubiquitin to the protein to be degraded QUESTION NO. 2Much of procollagen formation occurs in the endoplasmic reticulum and Golgi apparatus which requires signal peptide. All of the following statements about targeting a protein for the ER are true except. A. signal peptide usually has a positively charged N-terminus and a stretch of hydrophobic amino acids. B. signal peptide emerging from a free ribosome binds signal recognition…
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- Question 1. Suppose that the diagram below represents the genomic organization of an enzyme involved in eye pigment production in mice. Within the gene are four exons. Biochemical analysis has revealed that the active site of the enzyme is located in the C terminus of the protein. The nucleotide length of each exon and intron is shown. The dinucleotide sequence GT represents the 5’ splice site and the dinucleotide sequence AG represents the 3’ splice site. Both the 5’ and the 3’ splice sites must be present for splicing to occur. Assume that the first and second stop codons are located immediately after the first and second 5’ splice sites, respectively; the third and fourth stop codons are located near the 3’ end of exons 3 and 4, respectively; all these stop codons are in the correct reading frame. E) Suppose you isolate a mutant mouse that has white eyes. When you examine the size of the eye pigment enzyme produced by this mouse, you see that it is 400 amino acids long. Sequence…Question 1: tRNA and amino acyl tRNA synthetases Part a: How many codons encode the amino acid Isoleucine (Ile, I)? Part b: How many codons encode the amino acid Valine (Val, V)? Part c: How many codons encode the amino acid Methionine (Met, M)? Part d: How many tRNAs decode the Ile codons? Part e: How many tRNAs decode the Val codons? Part f: How many tRNAs decode the Met codon?Question 11. // Hint: Isoelectric focusing separates proteins based on their pI values, and can separate proteins that only differ by a net charge of ±1.±1. Recall that an amino acid residue with a negatively charged R group has a relatively low isoelectric point (pI) where it has zero net charge. Likewise, an amino acid residue with a positively charged R group has a relatively high isoelectric point (pI) where it has zero net charge. Order from Low pH to High pH
- QUESTION 12 The leucine zipper domain of transcription factors is not involved in DNA recognition but rather in facilitating dimerization. Given the chemical properties of the amino acid leucine, dimerization of transcription factors via this domain by (select the correct option). Facilitating hydrogen bonding with the aqueous environment. Chelation of bivalent ions such as Zn2+. Formation of coiled-coils through hydrophobic non-covalent interactions between evenly spaced Leu residues in alpha-helical domains. Physically connecting the two transcription factor subunits through unstructured loops.QUESTION NO. 1 A transition mutation A. occurs when a purine is substituted for a pyrimidine or vice versa. B. results from the insertion of one or two bases into the DNA chain. C. is most frequently caused by chemicals (like acridine) that intercalate into DNA. D. results from substitution of one purine for another or of one pyrimidine for another. E. always is a missense mutation QUESTION NO. 2 Degeneracy of the generic code denotes the existence of A. multiple codons for a single amino acid. B. codons consisting of only two bases. C. base triplets that do not code for any amino acid. D. different systems in which a given trip let codes for different amino acids. E. codons that include one or more of the unusual bases. QUESTION NO. 3 Replication A. requires that a phosphodiester bond of the incoming dNTP be hydrolyzed in order to be added to the growing chain. B. uses 5' to 3' polymerase activity to synthesize one…QUESTION NO. 1 Patients with the rare genetic disease xeroderma pigmentosum (XP) are very sensitive to light and are highly susceptible to skin cancers. The study of such patients has enhanced our knowledge of DNA repair because XP is caused by defective DNA repair nucleotide excision repair. (A variant, XP-V, is deficient in postreplication repair.) In nucleotide excision repair A. removal of the damaged bases occurs on only one strand of the DNA. B. only thymine dimers generated by UV light can be removed . C. the excision nuclease is an exonuclease. D. a single multifunctional enzyme carries out the repair process. E. only the damaged nucleotides are removed. QUESTION NO.2 Homologous recombination: A. occurs only between two segments from the same DNA molecule. B. requires that a specific DNA sequence be present. C. requires one of the duplexes undergoing recombination be nicked in both strands. D. involves a…