1,698 Answered Questions for the topic biochemistry

Biochemistry Science Biology Chemistry

05/27/20

i need help please
do you think that organisms/species will become more different from each other over time? Or more similar? Explain your reasoning. 
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05/20/20

Strontium (average atomic mass = 87.62) naturally exists as 4 stable isotopes with masses of 84, 86, 87, and 88. Which statement is correct?
Strontium-88 is the most abundant.Strontium-87 is the most abundant.All strontium isotopes are equally abundant.Strontium-86 is the most abundant.
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05/20/20

A bottle of Bourbon Whiskey contains 250.ml of liquid and 42% alcohol (C2H5OH). assuming density = 1.05g/ml, will the whiskey freeze if put into a -20.0 degree celsius freezer?

can someone please explain.
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05/20/20

A 0.152mol sample of CH2O2 reacted completely according to the reaction shown and 38.7 kJ of heat was released. What is delta H for this reaction?
2CH2O2+O2---->2CO2+2H2Ocan someone please explain.
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05/19/20

What is the concentration of bromide ion if 25.0 ml of a 0.50 M AlBr3 solution combines with 40.0 ml of a 0.35 M NaBr solution?
I converted AlBr3 and NaBr to moles however, I'm not so sure what to do after that. I know the final answer for the concentration of bromide ion is 0.79 mol/L. Can someone please help ?AlBr3 =... more
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05/19/20

Can someone please tell me if there is an easier way to answer this question? and if I did it correctly please.

A 2.32g sample of Na2SO4*nH2 yields 1.42g Na2SO4 upon heating. What is the value of n?Na2SO4*nH20--->Na2SO4(s)+nH20(g)Molar Mass Na2SO4 =142 g/molMolar Mass H2O = 18.016 g/molI'm not sure if I... more
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05/19/20

Tetrahydrocannabinol (thc), the active agent in marijuana, is composed of 80.16% carbon, 9.63% hydrogen and 10.17% oxygen by mass. What is the empirical formula of thc?
The answer I got was C7H10O, however I think I am missing a step since my answer was incorrect. This is what I did 80.16g C (1mol/12.01g)C =7 mol C 9.63g H (1mol/1.008g)H =10mol H 10.17g O... more
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05/19/20

A sample of ethanol (C2H6O) contains 3.024g of hydrogen. How many moles of carbon are in the sample ? Molar Mass of ethanol (C2H6O)=46.07g/mol
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Biochemistry

05/18/20

Aldolase B Expression
How can Aldolase B expression be regulated by transcription factors HNF-1, HNF-3, C/EPB and DBP?
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Biochemistry Biology Microbiology

05/13/20

What are the mechanisms of antibiotic resistance used by Pseudomonas aeruginosa and Burkholderia cepacia complex?
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Biochemistry

05/12/20

I have an enzyme that the enzyme-inhibitor complex requires 450 kJ.mol-1 to dissociate and that it displays kinetics somehow similar to non-competitive inhibition. are is a good inhibitor?
Human xanthine oxidase catalyzes the oxidation of hypoxanthine to xanthine and can further catalyze the oxidation of xanthine to uric acid. For the treatment of hyperuricemia and gout, several... more
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Biochemistry

05/10/20

biochemistry questions

20. Which of the following mechanisms of allosteric enzymes activation is correct? a They induce the denaturation of an apoenzyme b They block the enzyme active centre c They change the... more
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05/09/20

Why do we sweat order to cool off?
Drops of water and ethanol are placed on an overhead projector and the ethanol drop is seen to evaporate more rapidly. Our bodies utilize sweating as a means to stay cool and maintain... more
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Biochemistry

05/09/20

Using molarity to find solute mass and solution volume
Calculate the volume in liters of a 0.00599 mM calcium sulfate solution that contains 25.0g of calcium sulfate . Be sure your answer has the correct number of significant digits
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Biochemistry Science Biology

05/07/20

Calculate the number of ATPs generated by completely oxidizing one molecule of tripalmitoylglycerol into CO2 and H2O in muscle tissues.
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05/06/20

For chromium, Cr, the heat of fusion at its normal melting point of 1860 °C is 14.6 kJ/mol.
For chromium, Cr, the heat of fusion at its normal melting point of 1860 °C is 14.6 kJ/mol.The entropy change when 1.61 moles of solid Cr melts at  1860 °C, 1 atm is _____ JK-1.
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05/06/20

Arrange the substances on the left in order of increasing entropy. Assume 1 mole of each at standard conditions.
Arrange the substances on the left in order of increasing entropy. Assume 1 mole of each at standard conditions. match them in orderl SnCl4(l) Sn(OH)2(s) SnCl4(g) SnO(s) 1) lowest... more
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05/06/20

Water can decompose into H2 and O2 via electrolysis. How many moles of H2 could theoretically be obtained from 87.5 g of water. theoretical yeild: mol H2
Water can decompose into H2 and O2 via electrolysis. How many moles of H2 could theoretically be obtained from 87.5 g of water. theoretical yeild=:________________ mol H2
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05/06/20

Drawing Amino Acids (Organic Chem)
Draw the tetrapeptide below out in full chemical structure by attaching the four amino acids from your amino in order (this is an application of the characteristic organic reaction Formation of an... more
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Biochemistry

05/04/20

biochem assignment

predict how changing Trp105 to alanine would affect the ability of CEL-I to interact with GalNAc. A complete answer will describe the chemical role of Trp105 in GalNAc binding, how Trp and Ala... more
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Biochemistry

05/03/20

Percent yield of chemical reactions
Aqueous sulfuric acid reacts with solid sodium hydroxide to produce aqueous sodium sulfate and liquid water . If 2.15g of water is produced from the reaction of 34.3g of sulfuric acid and 12.9g... more
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Biochemistry

05/02/20

I need help with this question please!
Choose which characteristics are key features of the genetic code.Three nucleotides encode an amino acid.The code is degenerate.The code has directionality.The code is overlapping.The code has... more
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Biochemistry Biology Microbiology

04/30/20

Fermentation questions.
Fermentation questions.Fermentation Which gas is produced during the process of fermentation and is measured in fermentation tubes? What was the negative control in this experiment?  When yeast is... more
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04/30/20

Chem help please.3?
Calculate the mass of Li formed by electrolysis of molten LiCl by a current of 7.6 * 10 ^ 4 * A flowing for a period of 30 h. Assume the electrolytic cell is 90 % efficient.i did this and... more
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04/30/20

Chem help please.1?

What is the emf of this cell when [Fe^ 2+ ]=1.1M [Fe^ 3+ ] =2.0*10^ -2 M,P O 2 = 0.45 atm and the pH of the solution in the cathode compartment is 3.2.A voltaic cell utilizes the following... more
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