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April 20, 2014

Search: BioChem

Number of results: 152

science(chem)
See if this will help you. http://www.science.smith.edu/departments/Biochem/Biochem_353/Buffer_Prep.html#top There is a better site but I can't find it now. Its done by Haverford College (UK).
Sunday, September 21, 2008 at 11:28pm by DrBob222

Biochem
Thank you!
Monday, September 9, 2013 at 7:31pm by Amanda

Biochem
ggfgvgf
Monday, September 14, 2009 at 9:54am by Anonymous

Biochem
what is the pKa?
Thursday, May 6, 2010 at 3:57pm by Dr. Nick

chemistry
http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-S/saturated_solution.html
Monday, August 4, 2008 at 3:40pm by DrBob222

science
http://www.biochem.northwestern.edu/holmgren/Glossary/Definitions/Def-R/recessive_allele.html
Tuesday, February 16, 2010 at 8:44pm by Ms. Sue

Biochem
The conc is 6.0M HCL
Monday, September 13, 2010 at 10:50pm by Jeff

BioChem
What is the pH of hydroiodic acid (HI)?
Thursday, September 1, 2011 at 10:20pm by Max

BioChem
H2PO4^- + OH^- ==> HPO4^-
Friday, March 23, 2012 at 10:17am by DrBob222

biochem
Why concentration of salt is 0,05?
Tuesday, March 27, 2012 at 2:22pm by Anonymous

Biochem
See your post above.
Sunday, September 30, 2012 at 9:45pm by DrBob222

Biochem
What salt? what acid? what's the pH.
Monday, November 19, 2012 at 8:17pm by DrBob222

BIOCHEM
calculate the pH of 0.0076M KOH
Friday, September 7, 2007 at 4:08am by CHEM

BioChem
Wouldn't that be 0.4mg/mL x (1.00/0.25) = ?
Monday, October 31, 2011 at 10:38pm by DrBob222

biochem help needed
"College" is not the subject. Please be more specific.
Saturday, October 16, 2010 at 7:23pm by drwls

Biochem
Thank you! I solved for c and received c = 0.797 Would this answer be correct?
Friday, December 6, 2013 at 5:40pm by Anonymous

Biochem again add on
I have the pka from previous problems 4.75
Thursday, September 11, 2008 at 12:44am by bugbabe623

biochem
What is the structure and net charges of Aspartate, Lysine and Alanine at pH 7.5
Saturday, January 28, 2012 at 10:04pm by age

help with chem biochem
Ethanol + NAD+  ----> acetaldehyde + NADH + H+  
Wednesday, September 11, 2013 at 8:32am by tracy

Biochem
Should say absorbancy *, A, was plotted.. My phone autocorrected the word.
Friday, December 6, 2013 at 5:40pm by S

Biochem
But then if they ask us to predict the pH of this solution, using the Handerson-Haselbach equation...?
Wednesday, September 10, 2008 at 11:29pm by Pham

Bio/Biochem/Chem
Use the Nernst equation: E=(RT/zF)ln([K+]o/[K+]i)
Thursday, February 7, 2013 at 1:28pm by Devron

Enzyme Kinetics-Km values
http://www.worthington-biochem.com/introbiochem/substrateconc.html If the Michaelis factor is lower, more of the enzymes have bound in to a substrate-enzyme complex, resulting in a higher velocity of reaction production. The max km of course is at 1/2 the max velocity (...
Saturday, January 31, 2009 at 2:08pm by bobpursley

REPOST biochem
i don't understand this why can carboxyl and phosphate groups act as acids? as in, what makes an acid?
Thursday, October 18, 2007 at 9:45pm by J

Biochem
You need to read your posts to make sure they are ok. This post omits the concn HCl.
Monday, September 13, 2010 at 10:50pm by DrBob222

BioChem
Greater than (fill in your highest concn) OR you can extrapolate the graph in some circumstances and read it.
Monday, October 31, 2011 at 10:33pm by DrBob222

biochem
ph is 4.6, pKa is 4.76 in a .15M buffer solution, what are the concentrations of acid and base?
Monday, September 17, 2012 at 7:39pm by Lola

Biochem
Frankly, I recommend flash cards. They are easy to make, efficient, and have a proven record.
Wednesday, September 12, 2007 at 2:50pm by bobpursley

biochem
I believe human and animal cells do not have cell walls but get a second opinion. I'm no biochemist.
Monday, September 28, 2009 at 7:05pm by DrBob222

BIOCHEM
what are the problems created by using molecular oxygen as a recipient of the electrons from the oxidation of carbon compounds.
Monday, March 14, 2011 at 6:32pm by DAN

BioChem
I'm not a biochemistry but if you know the limiting reagent I can show you what to do. First you need to know the equation and which of those materials is the LR.
Wednesday, October 30, 2013 at 10:27pm by DrBob222

biochem
If you were to place a bacteria that could form spores in a stressful environment, what would the cell morphology look like?
Tuesday, October 20, 2009 at 7:56pm by chrissy

biochem
N, O, and F are the negative ions that make hydrogen bonds. Other atoms are not electronegative enough to do that. Which pair does NOT have N, O, F?
Sunday, January 27, 2013 at 12:36pm by DrBob222

biochem
can someone help me write a balanced 1/2 rxn for the oxidation of glyceraldehyde-3-phosphate to glycerate-1,3-bisphosphate? I confused on where to put the electrons and how many are needed
Saturday, December 3, 2011 at 3:19pm by amy

biology terms
http://www.worthington-biochem.com/introbiochem/substrateconc.html http://dictionary.reference.com/
Monday, October 6, 2008 at 5:57pm by Ms. Sue

Biochem
Can someone please help me find, or know of any molecules that are at least 20 bases (carbons, nitrogens..) long and have 3 hybrids (sp, sp2, dsp)
Thursday, December 28, 2006 at 10:08pm by Kara

Biochem
A = abc; slope = 0.433 which is a. Then 0.345 = 0.433*c. solve for c in mg/mL.
Friday, December 6, 2013 at 5:40pm by DrBob222

Biochem
10ml of HCl acid titrate with 9.9ml of NaOH. What is the mass in grams of HCl?
Tuesday, August 3, 2010 at 5:04pm by Amrik

biochem
I had problems posting, which required that I do it in two parts, which required some time.
Saturday, February 9, 2013 at 6:12pm by Devron

biochem
I am confused on the dillution of the MgCl2 do I have to divide by 95 because it is only 95% pure?
Sunday, March 10, 2013 at 3:10pm by She

Biochem
How many silver coins (weighing 26g each) would it take to provide 5 moles of silver(Ag).
Tuesday, September 27, 2011 at 1:00pm by Anonymous

BioChem
If you run an unknown sample and it is darker than your highest standard on your standard curve, what do you report as the concentration?
Monday, October 31, 2011 at 10:33pm by Dreamland11

BIOCHEM
pOH= -log(.0076) and pH= 14 -pOH
Friday, September 7, 2007 at 4:08am by bobpursley

Biochem
From 0.1 mL to (0.1+5+4.9) = 0.1 to 10 or the dilution factor is 10/0.1 = 100
Sunday, March 23, 2014 at 6:54am by DrBob222

Biochem
I have to memorize the 20 amino acids and some nucleotides...do you know where I can find some mnemonic tips for this???
Wednesday, September 12, 2007 at 2:50pm by Julie

Biochem
1 mole Ag = 107.87 so 5 moles is 5*that = approximately 540 g. So how many coins at 26g each will make 540 grams?
Tuesday, September 27, 2011 at 1:00pm by DrBob222

BioChem
Write the chemical equation for the reaction that occurs when you add NaOH solution to NaH2PO4/Na2HPO4 buffer solution
Friday, March 23, 2012 at 10:17am by Megan

Biochem
How many moles each do you need? That's mols = M x L = ? EDTA = 0.001 x 0.5 = ? etc. Then grams = mols x molar mass = ? The others are done the same way.
Monday, September 9, 2013 at 7:31pm by DrBob222

biochem
thank you so much. I just recently went back to school and havent had chemistry in more than 4 years and math has been even longer. I really appreciate the help :)
Saturday, September 10, 2011 at 6:40pm by amy

biochem
I have 0.500ml of 3M ethanol and then I take 0.250ml of it and put it to 0.250ml of 0.06M phosphate buffer, what is the final concentration?
Tuesday, March 27, 2012 at 10:01pm by trouble

Biochem
If .1ml of serum, 5ml of reagent and 4.9ml of distilled water are mixed together what is the dilution of the serum in the final solution
Sunday, March 23, 2014 at 6:54am by Dave

Biochem
What concentration of competitive inhibitor is required to yield 75% inhibition at a substrate concentration of 1.5x10-3 if Km=2.9x10-4 and Ki=2x10-5?
Sunday, April 17, 2011 at 2:36pm by Bradley

biochem
Many of today’s antibacterial drugs work by interfering with the growth of cell walls, why do these drugs tend to have little toxic effect on humans?
Monday, September 28, 2009 at 7:05pm by chrissy

Biochem
The pK of acetic acid is 4.76. Which statement is true at pH 5.0? [A^-] = [HA] [A^-] < [HA] [A^-] > [HA]
Sunday, August 28, 2011 at 4:59pm by Zack

biochem
I think that is where I keep getting stuck, with the basic math. I have 0.631 = .180x/10-0.1x and dont know where to go from there. Math was a long time ago for me :)
Saturday, September 10, 2011 at 6:40pm by amy

Biochem
What is the pH and pOH a solution that was made by adding 400 mL of water to 350 mL of 5.0 x 10^-3 M NaOH solution?
Friday, September 2, 2011 at 1:02am by Max

Biochem
HCl + NaOH ==> NaCl + H2O You don't have enough information to work a problem. You must know the M of either the HCl or the NaOH.
Tuesday, August 3, 2010 at 5:04pm by DrBob222

Biochem
This is just a dilution problem. 5E-3M NaOH x [(350)/(350+400)] OR use the dilution formula of mL1 x M1 = mL2 x M2
Friday, September 2, 2011 at 1:02am by DrBob222

biochemstry
Look at biochem testbook. "Acetal CoA is a cental character in the cellular metabolism... [through which] all the energy sources (fats, proteins, and carbohydrates) are interconvertible". Acetyl CoA is the correct answer.
Tuesday, September 1, 2009 at 10:26am by Mark

Biochem
When trying to purify a protein using column chromatography, what happens to the mass of the protein eluted from the column if you accidentally run it dry? Would it be more or less? Thanks.
Monday, October 18, 2010 at 11:35pm by Nancy

science
Thank you for using the Jiskha Homework Help Forum. First of all, do you mean "affect" or "effect?" Please see t5he following: 1. http://en.wikipedia.org/wiki/Enzyme_inhibitor 2. http://www.worthington-biochem.com/introbiochem/inhibitors.html 3. (animation): http://www.wiley....
Monday, September 15, 2008 at 4:49pm by SraJMcGin

Biochem
My best guess is that it would be less. If the column runs dry the protein sticks to the stationary phase, and you have no assurance that (a)the protein will re-enter the mobile phase in its entirety, and (b) that no degradation of the protein will occur.
Monday, October 18, 2010 at 11:35pm by DrBob222

Biochem
I must tell you that I'm not a biochemist and I don't know the equilibrium reactions you need; however, two equations will solve your problem. The first one is the Henderson-Hasslebalch equation of pH = pKa + log [(base)/(acid)] and second the equilibrium constant expression ...
Wednesday, January 30, 2008 at 6:46pm by DrBob222

biochem
When making Aspirin, I know that sulfuric acid is used as a catalyst. But i was wondering 1.) if the reaction would happen without the cataylst and 2.) can other substances be used as a cataylst in this reaction?
Sunday, January 24, 2010 at 2:36pm by chrissy

biochem
Two equations. pH = pKa + log(base)/(acid) or 4.6 = 4.76 + log b/a b + a = 0.15 Solve the two equations simultaneously for b and a.
Monday, September 17, 2012 at 7:39pm by DrBob222

biochem
Actually, from 8 a.m. to 3 p.m. is 7 hours. So it would be 14 generations in those 7 hours. That makes the answer 1,638,400. By 5 p.m. that would be 18 generations.
Thursday, September 24, 2009 at 5:07pm by Kristen

help with chem biochem
You have a 1 ml solution containing 100 uM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets converted to acetaldehyde . a) What will the final concentration of NADH be in the solution? 
Wednesday, September 11, 2013 at 8:34am by tracy

biochem
Yes, the Henderson-Hasselbalch equation is what you use. If x = mL sodium benzoate (base) then 100-x = mL benzoic acid(acid). 4.00 = 4.20 + log(0.18x)/[(100-x)*0.1] and solve for x
Saturday, September 10, 2011 at 6:40pm by DrBob222

Biochem again
Thanks for answering the first one :) Here is another Calculate the amount of sodium acetate and acetic acid necessary to make 100mL of a 0.500 M acetate buffer that is pH 5.2. I believe I have the answer but I want to make sure I did the work correctly.
Thursday, September 11, 2008 at 12:44am by bugbabe623

Biochem
calculate the volumes of 0.10 M acetic acid and 0.20 M sodium acetate that are needed to prepare 48-mL buffer solution with pH = 3.70. Ka for acetic acid is 1.75 x 10-5
Friday, April 22, 2011 at 6:01am by Iris

biochem lab
any help with any of these questions is appreciated. Why was lysozyme pipetted with the Drummond micropipetter? Why can we crystallize lysozyme at room temperature when most proteins require 4 degrees celcius? Why can lysozyme experiments be set up without preservatives needed...
Wednesday, April 30, 2008 at 1:53am by stew

biochem
If I am given a solid chemical form of both the acid and the base, how do I determine how many grams of each I need to make 1L of a 25mM Tris-HCl buffer with acid concentration of 18.94mM, and base concentration of 6.06mM?
Thursday, February 17, 2011 at 1:35pm by Jenny

Biochem
A buffer solution is prepared by mixing 200 mL of 0.2 M salt solution and 400 mL of a 0.2 M acid solution. What is the concentration of the resulting buffer? ~what is the pKa?
Monday, November 19, 2012 at 8:17pm by Dr. Nick

biochem
Exactly 100 bacteria with a generation time of 30 min are introduced into fresh sterile broth at 8am and maintained at an optimum incubation temperature throughout the day. How many bacterian are present at 3pm? How many generation will take place by 5pm the same day?
Thursday, September 24, 2009 at 5:07pm by chrissy

Biochem
Describe the one dehydration reaction in glycolysis. Include reactants, products, enzyme, and which step it is. I know that it is step 6 and I believe that the reaction uses glyceraldehyde-3-phosphate dehydrogenase to convert glyceraldehyde-3-phosphate into 1,3-...
Monday, April 6, 2009 at 11:49pm by Jaime

Biochem
HEPES, is a commonly used component of physiological buffers. The PKa of the protonated amino group of HEPES is 7.55 at 25C. Describe the preparation of 1.00L of 0.100M HEPES buffer, pH 8.00, from the sodium salt of the basic form of HEPES (MW 260.3), .0M HCL and deionized water
Monday, September 13, 2010 at 10:50pm by Angel

Biochem
Calculate the amount of Tris(hydroxlmethyl)aminomethane(Tris) necessary to make 100mL of a 0.100 M Tris buffer that is equimolar in Tris-base (MW=121.1 g/mol) and Tris-HCL (MW= 157.6g/mol)
Wednesday, September 10, 2008 at 11:29pm by bugbabe623

college majors
Biochemistry, or premed, or medical science, or chemistry, or biology, or even medical technology. You need a high MCAT, and getting biochem, premed, or medical science bachelors is an excellent prep for the MCAT.
Friday, September 4, 2009 at 9:45pm by bobpursley

Biochem
We will need 0.5L extraction buffer with 25 mM HEPES, 1 mM EDTA, and 1 mM DTT. Please calculate how many grams of each solute are needed. (HEPES 238.3; EDTA 292.2; DTT 154.2)
Monday, September 9, 2013 at 7:31pm by Amanda

Chemistry (or Physio/Biochem)
H2O + CO2 <==> H2CO3 <==> H^+ + HCO3^- So if we restrict the breathing, CO2 rises, and Le Chatelier's Principle says that will force the reaction to the right; therefore, my best guess is that the blood pH will decrease (become more acid).
Sunday, March 14, 2010 at 9:14pm by DrBob222

reading
My youngest daughter was an auditory learner, often she would read her biochem text aloud into a recorder, then play it back to herself. But she did develope strategies that worked with reading, like taking text notes, using flash cards, and using a reading mask in texts that...
Thursday, January 15, 2009 at 9:11pm by bobpursley

biochem
Yes, if you divide the right number by the right number. :-) Calculate the grams MgCl2 you need, then divide that number by 0.95 to find the final grams to use.
Sunday, March 10, 2013 at 3:10pm by DrBob222

biology
Thank you for using the Jiskja Homewrk Help Forum. Try the following: `. http://en.wikipedia.org/wiki/Endergonic_reaction 2. http://library.thinkquest.org/27819/ch4_2.shtml 3. (part Ii of #3: http://library.thinkquest.org/27819/cgi-bin/quiz.cgi?quiz=4_2 4. (Broken Link Removed...
Monday, February 11, 2008 at 12:24am by SraJMcGin

Biochem
It isn't clear from your post if the standard was diluted in a manner similar to that of the sample. I will assume it was; if not you will need to make a adjustment for the dilution. If the sample is 4.5 mM and gave A = 0.5, it must be a higher concn than the standard at A = 0...
Sunday, September 30, 2012 at 9:50pm by DrBob222

biochem
of what? the ethanol? The final concn of the ethanol, assuming volumes are additive, is 3M x [0.250 mL/(0.250+0.250)] = 1.5M right? (Note: ethanol and water volumes are not additive. Approximately 4% error).
Tuesday, March 27, 2012 at 10:01pm by DrBob222

Biochem
The theory of ATP synthesis by the ATP synthesis apparatus is called the _______ theory. I have no idea. Can some please help? Go to www.google.com and type in "ATP synthesis" without the parentheses. I think you will find your answer about four or five references from the top...
Thursday, July 20, 2006 at 5:05pm by shamaev

Biochem
ΔG = ΔG chem + ΔG elec Remember there are 2 Na+ transported: 2*ΔG = -RT*ln[glucose in/glucose out] [glucose in/glucose out] = apx 2000
Saturday, November 2, 2013 at 9:57pm by Anonymous

biochem
I need to create a 100ml buffer with a pH of 4.00 using 0.100M Benzoic acid (pKa = 4.20)and 0.180M sodium benzoate. What volume of each material do I need to make this buffer? I think I need to use pH=pKa + log(A/HA)but am not sure if that is correct. Any help would be ...
Saturday, September 10, 2011 at 6:40pm by amy

BioChem
If you want to determine the actual salicylate concentration for a sample that gives you a darker color than the highest standard, you would need to make a dilution of it. If you dilute it by mixing .25 mL of sample with .75 mL of water and then find that this mixture has a ...
Monday, October 31, 2011 at 10:38pm by Dreamland11

help with chem biochem
Ethanol + NAD+  acetaldehyde + NADH + H+  You have a 1 ml solution containing 100 uM Ethanol, and 1 mM NAD+. You then add 1 mg of alcohol dehydrogenase. Assume all of the ethanol gets converted to acetaldehyde.  a) What will the final concentration of NADH be in the ...
Wednesday, September 11, 2013 at 8:32am by tracy

science biochem- please help!!!!
I don't know where to start with it? A tube is set up for radioimmunoassay containing antibody with a capacity for binding 1ug antigen. Both labelled (50,000 counts per ug) and unlabelled antigen are added to the tube. Work out a formula to calculate the amounts of counts ...
Sunday, February 27, 2011 at 5:51pm by Isabel

biochem
Which of the following pairs of compounds would NOT make a hydrogen bond with each other? CH3 and H20 H20 and HF NH4 and HF H2O and CH3COOH all of the following would make hydrogen bonds
Sunday, January 27, 2013 at 12:36pm by Jen

Biochem
If the calibration curve for a Beer's Law plot of a protein assay had a slope of 0.433 when absorb acne, A, was plotted as a function of protein concentration, c, in mg/mL. The absorbance of an unknown protein sample was 0.345. What is the concentration of protein in this ...
Friday, December 6, 2013 at 5:40pm by S

biochem
It would have a clear spot in the middle of the cell if you try a Gram stain, but if you use a spore stain, it would have a green spore inside of the red cell. P.S. You shouldn't wait until the night before your lab manual is due before you decide to do it.
Tuesday, October 20, 2009 at 7:56pm by Bob

biology
Since this is not my area of expertise, I searched Google under the key words "enzyme concentration activity" to get these possible sources: http://www.chemsoc.org/networks/learnnet/cfb/enzymes.htm http://www.worthington-biochem.com/introbiochem/enzymeConc.html http://student....
Sunday, March 2, 2008 at 12:37am by PsyDAG

Bio/Biochem/Chem
Okay, I am assuming that this is at 25º C R=8.314 J.K-1.mol-1 F=96485 C.mol-1 T=25+273.15 z=+1 [K+]o=1 [K+]i=20 E=(RT/zF)ln([K+]o/[K+]i) E=(8.314 *298/(1*96485)ln(1/20) E=61ln(1/20)=-183mV
Thursday, February 7, 2013 at 1:28pm by Devron

biochem.
http://wiki.answers.com/Q/What_does_hypertonic_and_hypotonic_and_isotonic_mean
Tuesday, September 23, 2008 at 9:29pm by DrBob222

Biochem
Desribe the preparation of 2.00 L of 0.100M pH 9.00 glycine starting with the sodium chloride salt of zwitterionic glycinhe and 1.00M NaOh. If a reaction that generated 2.00 mmoles of base were carried out in 100 mL of the above buffer, what would be the final solution pH? ( ...
Tuesday, September 13, 2011 at 6:08pm by Sandra

Biochem
For membrane-associated proteins, the consensus sequence _______ is found on the inchoate (new) polypeptide and ______ to halt. a. pribnow, replication b. signal peptidase, transcription c. stop-transfer peptide, transcription d. stop-transfer sequence, translation e. stop-...
Tuesday, August 1, 2006 at 11:15am by Sarah

BioChem
Please help with this question. Insulin, antibodies, enzymes and progesterone are four of many molecules found in and around cells. Of these four__________ are/is not a protein. a. antibodies b. insulin and antibodies c. antibodies and progesterone d. progesterone I think the ...
Saturday, June 17, 2006 at 5:29pm by Jamshid

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