1,708 Answered Questions for the topic biochemistry

Biochemistry

02/26/21

A research question about Biochem
There is a protein that has a pI of 10.5. However, when the protein runs at pH 8 on a reducing SDS-PAGE gel, the protein moves towards the positive electrode. How is this possible?
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02/24/21

Arrhenius Equation
The activation energy for the gas phase decomposition of ethyl chloroformate is 123 kJ.ClCOOC2H5C2H5Cl + CO2The rate constant at 462 K is 5.91×10-4 /s. The rate constant will be _____  /s... more
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02/24/21

Arrhenius equation
The activation energy for the gas phase isomerization of dimethyl maleate is 111 kJ.cis-CH3OOCCH=CHCOOCH3trans-CH3OOCCH=CHCOOCH3The rate constant at 713 K is 9.77×10-4 /s. The rate constant will... more
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02/24/21

Mechanisms: 2nd step
The following mechanism for the gas phase reaction of nitrogen dioxide with carbon monoxide at temperatures above 225 oC is consistent with the observed rate law......step 1.....fast:......NO2 +... more
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02/24/21

Concentration of sulfuric acid after neutralization
Write the balanced neutralization reaction that occurs between H2SO4 and in KOH aqueous solution. Phases are optional.Suppose 0.250 L of 0.500 M of H2SO4 is mixed with 0.200 L of 0.240 M KOH. What... more
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02/24/21

Chemistry: Mechanisms
A student proposed the following mechanism for the gas phase reaction of fluorine with chlorine dioxide......step 1.....fast:......2 ClO2  Cl2O4.....step 2.....slow:....Cl2O4 + F2  2 FClO2(1) What... more
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02/24/21

Chemistry: Mechanisms
The following mechanism has been proposed for the gas phase reaction of nitrogen monoxide with bromine......step 1.....fast:......NO + Br2  NOBr2.....step 2.....slow:....NOBr2 + NO  2 NOBr(1) What... more
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02/24/21

Chemistry: Mechanisms
The following mechanism has been proposed for the conversion of tert-butyl bromide to tert-butyl alcohol in aqueous solution:step 1  slow:  (CH3)3CBr  (CH3)3C+ + Br-step 2  fast:   (CH3)3C+ +... more
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02/24/21

Chemistry: Mechanisms
The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism:step 1  slow:  H2O2 + I-  H2O + OI-step 2  fast:   H2O2 + OI-  H2O + O2 +... more
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02/24/21

Arrhenius Equation
The activation energy for the gas phase isomerization of cis-cyanostyrene is 193 kJ.cis-C6H5CH=CHCNtrans-C6H5CH=CHCNThe rate constant at 672 K is 3.87×10-4 /s. The rate constant will... more
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Biochemistry Chemistry Chem

02/22/21

Which of the solutions (A, B, or C) will have the highest freezing point?
Consider the following four solutions:(A) 0.175 moles of KClKClin 1.250 kg of water (B) 0.175 moles of C6H12O6C6​H12​O6​(glucose) in 0.750 kg of water (C) 0.075 moles of Ca(NO3)2Ca(NO3​)2​in 0.950... more
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Biochemistry

02/22/21

Biochemistry question
A) Describe how you would set up an experiment to determine if a newly synthesized peroxide is a mutagen. How would you interpret the results?B) How might you determine if addition of an... more
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Biochemistry Biology Microbiology

02/21/21

General Biology
You receive a bacteria culture from a hospital and are asked to figure out which bacteria are present in the culture. You find that there is peptidoglycan in the culture and lipopolysaccharides.... more
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Biochemistry Biology Microbiology

02/21/21

General Biology
you want to discover how much a heat a DNA strand can withstand before denaturing. Youdecide to heat DNA in a beaker and measure the amount of DNA content throughout. At the beginning the DNA... more
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Biochemistry Biology Chemistry

02/21/21

General Biology
you need to make a solution of NaOH in the lab. You decide to make your solution with 12 g of NaOH in 900 ml of water. You find your solution to have a pH of 10.00, what is the molarity of the... more
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02/20/21

What is the difference in development of natural products as a pure, well-defined substances and as a complex extract. 
Any differences in determining the dose between an extract and a pure substance? Why could it differ in an extract?
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02/19/21

Integrated Rate Laws
The decomposition of hydrogen peroxide in dilute sodium hydroxide at 20 °CH2O2(aq)H2O(l) + ½ O2(g)is first order in H2O2 with a rate constant of 1.10×10-3 min-1.If the initial concentration... more
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02/19/21

Integrated Rate Law
The gas phase decomposition of hydrogen peroxide at 400 °CH2O2(g)H2O(g) + ½ O2(g)is second order in H2O2.In one experiment, when the initial concentration of H2O2 was 8.60×10-2 M, the concentration... more
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02/19/21

Integrated Rate Law
The gas phase decomposition of sulfuryl chloride at 600 KSO2Cl2(g)  SO2(g) + Cl2(g)is first order in SO2Cl2 with a rate constant of 2.80×10-3 min-1.If the initial concentration... more
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02/19/21

Integrated Rate Law
The decomposition of hydrogen peroxide in dilute sodium hydroxide at 20 °CH2O2(aq)H2O(l) + ½ O2(g)is first order in H2O2.During one experiment it was found that when the initial concentration... more
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02/19/21

Integrated Rate Law
The decomposition of nitrous oxide at 565 °CN2O(g)N2(g) + ½ O2(g)is second order in N2O with a rate constant of 1.10×10-3 M-1 s-1.If the initial concentration of N2O is 1.67 M, the concentration... more
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02/18/21

Integrated rate law
The gas phase decomposition of hydrogen iodide at 700 KHI(g)½ H2(g) + ½ I2(g)is second order in HI with a rate constant of 1.20×10-3 M-1 s-1.If the initial concentration of HI is 1.06 M, the... more
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02/18/21

Integrated rate law
The following initial rate data are for the reaction of tertiary butyl bromide with hydroxide ion at 55 oC:(CH3)3CBr + OH-  (CH3)3COH + Br- Experiment [(CH3)3CBr]o, M [OH-]o, M Initial Rate,... more
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02/18/21

Integrated rate law
The following initial rate data are for the oxidation of arsenate ion by cerium(IV) ion in aqueous solution:AsO33- + 2 Ce4+ + H2OAsO43- + 2 Ce3+ + 2 H+ Experiment [AsO33-]o, M [Ce4+]o,... more
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Biochemistry Biology Microbiology

02/18/21

What's the role of actine outside the cytoskeleton?
What's the role of actine outside the cytoskeleton?
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