QUESTION 28Which amino acid is most likely to break an alpha helix?AlanineIsoleucinenone of the choices are correctProlineQUESTION 29If an enzyme has a kcat = 3.3e's-1, Km = 5.9e M, what is its catalytic efficiency? Give your answer in2 significant figures and scientific notationQUESTION 30To determine the molecular weight of a purified protein you subject it to ESI mass spectrometry at pH=2. The spectrumi t aiahbeni aln hain m tianClick Save and Submit to save and submit. Click Save All Answers to save all ansuers.786 Mostly cloudy9 Type here to search

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Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question 16 For a Michaelis Menten reaction the following rate constants were observed: k1 = 7x 107/M-sec k1 =1x 103/sec k2 = 2 x 104/sec The value of Km is: Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 0.3 M b 0.03 M 0.003 M d. 0.0003M e 0.00003 M f 0.000003 M 0.0001 M 0.01 M i 0.001M
Question 13 Which of the following is the correct structure of the tripeptide Gly-Phe-Ala? a. H-N. Ph H. N. b. HN OH с. H,N. Ph d. OH но Ph NH, O a O b O d * Previous ASSIFICATION OF AMINO ACOS perbes, tis ed on the in chemican VE CLASS CLASSIFI tende nd the LG their co0 useful POLARITY of their R polar, aliphatic R group R group R ter at biological pH, near pH 7.0). ged R group d(basic) Rgroup cidic) Rgroup saov OM HHHIN
QUESTION 1 The full name of this amino acid is The 3-letter abbreviation is Please also note the following: • The non-ionized structure is shown • Spelling matters • For the acidic amino acids use the full name, e.g. "so-and-so acid" • Case does not matter • Do not include L- or D- in the name НООС- СH - NH2 CH3
QUESTION 26 Which of these reagents is commonly used to determine the number of polypeptides in a protein? dansyl chloride 2-mercaptoethanol (B-ME) DEAE cyanogen bromide iodoacetate O O O O
QUESTION 38 In a 250µl reaction containing 0.3 nmol of a Michaelis enzyme with Km = 4.4 x 10 M and saturating substrate concentration, product was formed at an initial velocity of 6.3 x 10 M min-1. What is kcat for this enzyme? Give your answer in 3 sigfigs in scientific notation, for example 1.20 e -3 Click Save and Submit to save and submit. Click Save All Answers to save all answers. O Type here to search 78°F Mostly cloudy End 4) DII PrtScn F8 Home F9 F6 F2 F3 F4 *- & 7 8. 4. #3
QUESTION 35 Calculate the reaction rate of catalase at room temperature using the following data. Depth of Hydrogen Peroxide Solution Time = 66.3 seconds 2.2 cm O 3.000 68.50 0.080 O 30.140 O 0.033
Question 33 Orciprenaline (C₁₁H₁7NO3, 211.258 g/mol) is a bronchodilator used in the treatment of asthma. The BP assay for orciprenaline tablets is described below. HO The following information was obtained during the assay: Weight of 20 tablets = 2.5564 g Weight of tablet powder assayed = 0.5266 g Absorbance reading - 0.5868 Stated content per tablet = 20 mg A (1%, 1 cm) at 276 nm = 72.3 OH H N OH "Weigh and powder 20 tablets. Shake a quantity of the powder containing 80 mg of orciprenaline sulphate with 50 mL of 0.01 M hydrochloric acid (HCI), filter and add sufficient 0.01 M HCI to the filtrate to produce 100 mL. Dilute 10 mL to 100 mL with 0.01 M HCI and measure the absorbance of the resulting solution at the maximum at 276 nm." Orciprenaline 4 Answer the following questions, explaining your reasoning clearly. a) Calculate the amount of orciprenaline in the tablet powder analyzed. b) Calculate the average amount of orciprenaline per tablet. c) Calculate the percentage of the stated…
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
QUESTION 4 Lipids are hydrophobic molecules and have no charge. If they are loaded into a gel, and an electric field is applied, which way will they move, if at all? O Some will migrate to the + electrode and some will migrate to the - electrode. O They will migrate toward the - electrode They will not move They will migrate toward the + electrode
QUESTION 3 In the presence of 0.000005 M competitive inhibitor, an enzyme exhibits an apparent Km of 0.002M. If the Kt of the inhibitor is 0.0000003 M, what is the true Km of the enzyme? Give your answer with 3 significant figures an scientific notation. For example, 0.000023434 is 2.34e QUESTION 4 Approximately how many domains are in an 82.5 kDa protein? O a. 2 O b.3 O C. 4 O d. 1 2.5 QUESTION 5 How long is an a-helix that contains 36 amino acid residues? 6.0 nm 5.4 nm 78 Mostly clody a n Click Save and Submit to save and submit. Click Save All Answers to save all ansuers P Type here to search
Question 15 The GroES subunit has 14 identical 549-residue subunits arranged in two stacked rings with 7 subunits eac True O False
Question 42 The structure below HO, urs O contains trans double bonds O represents an unsaturated fatty acid O does not pack very easily O two of these are correct O three of these are correct O contains cis double bonds O packs easily

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Which amino acid is most likely to break an alpha helix? Alanine Isoleucine none of the choices are correct Proline