In the deoxy state of HB, which of the following does not occur? O An intra-chain salt bridge between Val 98 and Tyr 145. O An intra-chain salt bridge between Histidine 146 and Aspartate 94 side chains O A peptide bond between Tyr 145 and His 146. O An inter-chain salt bridge between Histidine 146 and Lys 40
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- Question 4 a-D-galactose from B-D-glucose can be differentiated using which method of analysis? All of these Methylation analysis O Use of exoglycosidases NMR by the change in chemical shiftQUESTION 3 Biocatalysts are effective because: O a. They increase the activation energy of a reaction Ob. They stabilize the transition state O. They decrease the rate of the reaction Od. They decrease the activation energy of a reaction QUESTION 4 Which of the following statements is INCORRECT regarding L-amino acids and D-amino acids? O NH3 group on the left of the chiral carbon in both isomers O b. They are nonsuperimposable mirror images of each other O NH group on the left of chiral carbon in L isomers Od. They are enantiomersQuestion 1 Amyloid Precursor Protein (APP) is actually thought to be a natural neuroprotective agent induced by neuronal stress or injury. O True O False Question 2 Which of the following is not a property of serine protease? A globular protein with high molecular weight ● It is initially synthesized as a zymogen It has uniquely activated tyrosine residue at the active site Cleaves polypeptide at a specific amino acid residue Question 3 RTK is activated by cyclic AMP. O True False
- Question 9 The mechanism for all template-directed synthesis of any type of nucleic acid involves which of the following? A nucleophilic attack of a 3' hydroxyl toward a phosphoryl group of a nucleoside triphosphate, releasing PPi. B nucleophilic attack of a 5' hydroxyl toward a phosphoryl group of a nucleoside triphosphate, releasing PPi. nucleophilic attack of a 5' hydroxyl toward a phosphoryl group of a nucleoside triphosphate, releasing PPi. D nucleophilic attack of a 3' hydroxyl toward a phosphoryl group of a nucleoside monophosphate, releasing Pi.Question one parts A though E a. True / False: Guanine to cytosine intermolecular interactions (hydrogen bonding) is stronger than adenine to thymine. b. What peptide would be made from the following DNA sequence? 5'ATCCCGGGTACTCACTCCCAT3' Start-Gly-Pro-Stop Start-Gly-Ser-Pro-Val-Arg-Val Start-Gly-Gly-Thr-lle-Arg Start-Arg-Arg-Gly-Gly c. Starting from the MRNA strand below - what peptide would be produced? Remember your start and stop codons...5'CCAUGCGGCAUACCAAAUUACUAAACUAGC3' Start-Arg-His-Thr-Lys-Leu-Leu-Asn-Stop Start-Asn-Leu-Leu-Lys-Thr-His-Arg-Stop Start-Arg-Lys-Leu-Asn-Stop Pro-Met-Arg-His-Leu-Leu-Asn d. Which type of RNA comprises over 80% of total cellular RNA? ribosomal RNA Messenger RNA Transfer RNA e. True / False - All of the DNA nucleotides are attached to the deoxyribose in the BETA configuration (at the anomeric carbon of the sugar). B (Ctrl) -QUESTION 1 Which of the following concepts in column A best fits the concept in column B. p-Nitrophenyl a-D-Glucoside Action of intracellular a-GLUCOSIDASE + NaHCO3 Boiling cells Tris-pH 5.0 A. Substance that act as molecular mimic of a maltose molecule B. Develops TT-Nitrophenyl into a yellow colour reagent for measurement at 400nm c. Breaks the a-linkages of p-Nitrophenyl a-D-Glucoside, leaving p-Nitrophenyl and a glucose molecule D. Allows transport of p-Nitrophenyl a-D-Glucoside across the membrane E. Stop the reaction and release internal p-Nitrophenyl
- AsapQuestion 16 Concerning SDS-PAGE: |A The gel is a copolymer of agarose and bis- agarose. BA magnetic field drives the migration of the proteins within the gel. C Is usually performed in presence of a molecular weight marker composed of a mixture of polynucleotides of known molecular weight. D The gel behaves like a molecular sieve. E In this type of electrophoresis the proteins migrate from the positive (+) to the neg- ative (-) electrode.QUESTION 28 Which amino acid is most likely to break an alpha helix? Alanine Isoleucine none of the choices are correct Proline QUESTION 29 If an enzyme has a kcat = 3.3e's-1, Km = 5.9e M, what is its catalytic efficiency? Give your answer in 2 significant figures and scientific notation QUESTION 30 To determine the molecular weight of a purified protein you subject it to ESI mass spectrometry at pH=2. The spectrum i t aiahbeni aln hain m tian Click Save and Submit to save and submit. Click Save All Answers to save all ansuers. 786 Mostly cloudy 9 Type here to search
- QUESTION 10 Select a property that does not belong to allosteric enzymes. They conform to hyperbolic Michaelis-Menten kinetics They may have binding sites for regulatory molecules that are separate from active sites They tend to have a signmoidal curve of rate versus [S] They undergo conformation changes as a result of modulator binding.5 pts Question 9 95 58 40 HS HS SH 65 8 M urea and 72 B-mercaptoethanol 65 Hs84 Hs- SH 72 26 HS 110 SH 84 26 110 95 124 40 58 Native ribonuclease Denatured reduced ribonuclease Figure 2.53 Biochemistry, Seventh Edition O 2012 W. H. Freeman and Company The image above shows how Anfinsen unfolded ribonuclease for his classic experiment to see if proteins contain all necessary information for adopting their folded states on their own. To achieve proper refolding and ribonuclease activity, Anfinsen must have: trick question: ribonuclease cannot adopt its folded state without the help of cellular machinery removed the mercaptoethanol followed by the urea very carefully removed both the urea and mercaptoethanol at the same time removed the urea followed by the mercaptoethanolQuestion 11 Given this MRNA strand: 3' - AUGAGGAAGGUA - 5'; what are the components of the polypeptide? First Position Third Position (3' end) (5' end) U A G UGU Cys UUU Phe UUC Phe UCU Ser UCC Ser UCA Ser UAU Tyr UAC Tyr UAA Stop UAG Stop |U UGC Cys UUA Leu UUG Leu UGA Stop |A UGG Trp U G CGU Arg CGC Arg CGA Arg UCG Ser CAU His САС His CAA Gln CAG Gln CUU Leu CCU Pro U ССС Pro CỤC Leu CỦA Leu CUG Leu CCA Pro A CCG Pro CGG Arg G U AAU Asn AAC Asn AAA Lys AAG Lys GAU Asp GAC Asp GAA Glu GAG Glu AUU Ile ACU Thr АСС Thr ACA Thr ACG Thr AGU Ser AUC Ile A AUA Ile AGC Ser AGA Arg A AUG Met* AGG Arg G GUU Val GGU Gly GCU Ala GCC Ala GCA Ala GCG Ala U GGC Gly GÚC Val G GUA Val GGA Gly |A GUG Val GGG Gly G