Thursday
February 26, 2015

Posts by Andrew


Total # Posts: 1,022

Health
1 How do hepatocytes (& Kupffer cells) get access to slow-moving blood? 2 How is bile produced and collected as a fluid separate from blood? Thanks!
April 9, 2009

Biochemistry
Have two quick questions... Why does denatured protein precipitate? (when heated, why does it give that poached egg look? I know heat denatures protein, but why does it look like that? something to do with bonds?) And also... why does protein denature in heat? Thanks!
April 6, 2009

Social Studies
Bad: People began bootlegging and smuggling alcohol from Canada, and brewing/distilling it in their basements. With caused numerous arrests. Good: Less alcohol related accidents and deaths were recorded.
April 1, 2009

Chemistry
Never Mind
April 1, 2009

Chemistry
Suppose 1.0 mol of substance A reacts with 1.0 mol of substance B. to produce 2.0 mol of substance C. In a reaction, 2.4 mol of substance A is allowed to react with 2.1 mol of substance B. What amount in moles of substance c is produced?
April 1, 2009

Chemistry
Calculate the value of the solubility product (Ksp) for CdS given the following standard reduction potentials: CdS + 2e- --> Cd + S-2 E° = -1.21V Cd+2 + 2e- --> Cd E° = -0.402V --------------------------------------- CdS + Cd --> Cd + Cd+2 + S-2 E° = -0....
March 30, 2009

Chemistry
Thank you so much! I was trying to work with wrong E_cell
March 30, 2009

Chemistry
A galvanic cell is based on the following half-reactions at 25C: Ag+ + e- --> Ag H2O2 + 2H+ + 2e- ---> 2H2O (not H2O2) Predict whether E_cell is larger or smaller than E°_cell for the following case. [Ag+]= 1.0M, [H2O2]= 2.0 M, [H+]=2.0M...
March 30, 2009

Biochemistry
Why are the Krebs Cycle and electron transport pathways downregulated during period of high ATP demand? Has something to do with pyruvate and lactate...
March 18, 2009

math
The math problem we need help with is: lbs of can collected by 4 children were as follows: #1 49 #2 72 #3 108 #4 121. the answer is 10. what is the question. where do i start to figure out what the question is their looking for?
March 17, 2009

Science
the answer is D
March 17, 2009

earth scince
What process is mainly responsible for shaping Earth's land surface
March 15, 2009

To Writeacher
In what way is Kreon superstitious?? We can only use the play Oedipus Rex and not the others (eg, Antigone..) so I'm finding a little bit difficult to get a good grasp on Kreon's character. At the end of Oedipus Rex it shows how Kreon is eager to grasp power but I can...
March 9, 2009

Oedipus Rex
Has anyone read this play?? I'm having a little trouble comparing and contrasting Oedipus and Kreon. I need to back up my thesis of Kreon serving as a foil for Oedipus... so far what I have is that Oedipus is a tragic hero by his tragic flaws, mistakes and pride, while ...
March 9, 2009

math
how to convert a fraction to a decimal? 3 - 5 1/50
March 8, 2009

math
how to convert a fraction to a decimal
March 8, 2009

Biochemistry
Is the substrate level phosphorylation (of succinate) spontaneous under conditions that exist in the mitochondria?
March 7, 2009

Biology
What's the purpose of a blank, a postivie control and a negative control?? (say, for an experiement with a spectrophotometer).
March 4, 2009

Biochemistry
Could someone please tell me the effects of anions on enzymes? For example, does anion such as NaCl act as an activator or inhibitor of the enzyme amylase?? I tried google but it just gave me nonsensical scienfitic papers. My reasoning is that it is an inbititor of enzymes ...
March 2, 2009

10th grade English (Art Essay)
This is my Art assignment but I just wanted to make sure whether there are any mistakes. Please help! Reading or evaluating the visual images around us is a critical skill to have in our lives. By looking at different images and sculptures, people can evaluate and discover the...
March 2, 2009

bible charater
500 begins it 500 ends it 5 in the middle is seen first of all letters first of all numbers
March 1, 2009

government
Words that mean "Equal Justice Under the Law" Is there such a thing or do they just want words that relate to it?
February 26, 2009

ecology
what causes the buildup of a river delta
February 17, 2009

Biochemistry
I need to copare and contrast gel electrophoresis and paper strip electrophoresis... I know what both of them are, but I need to explain in terms of the charges on the proteins.. and I need to describe the polyacrylamide gel electrophoresis method in terms of mobility??????? ...
February 12, 2009

Physics
A drowsy cat spots a flowerpot that sails first up and then down past an open window. The pot was in view for a total of 0.37 s, and the top-to-bottom height of the window is 2.20 m. How high above the window top did the flowerpot go? S= ut +(1/2)at^2 S= (0)(0.215) + (0.5)(9.8...
February 12, 2009

Physics
A drowsy cat spots a flowerpot that sails first up and then down past an open window. The pot was in view for a total of 0.37 s, and the top-to-bottom height of the window is 2.20 m. How high above the window top did the flowerpot go? S= ut +(1/2)at^2 S= (0)(0.215) + (0.5)(9.8...
February 11, 2009

Chemistry
Thanks for your help!!
February 9, 2009

Chemistry
So since the vapor pressure of water is 23.8 torr p = 0.99 * 23.8 p = 23.6 is this right?
February 9, 2009

Chemistry
What is the total vapor pressure of NaCl solution at 25C with mole fraction of 0.01? (X_NaCl = 0.01) Thanks!!
February 9, 2009

Math
what dose sea level mean in math :()!
February 5, 2009

chemistry
Between HF and H2O, which one has the greater intermolecular force? i know they both exhibit hydrogen-bonding, but which one is greater? thanks
January 28, 2009

Biochemistry
Assuming pKa values of 3.8 for the a-COOH and 8.5 for the a-amino groups and that the numbers in parentheses indicate the pKa values of side chain groups, at what pH would electrophoresis provide the best resolution of the following dipeptides? His (6.0) – Ser Gly – ...
January 27, 2009

Dr Bob
On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect. Think about how pH ...
January 26, 2009

Biochemistry
I have a 1/40 dilution as 19.18 mg/ml. how would i get back to the original solution?
January 25, 2009

Biochemistry
So with NaOH... it's a strong base... it denatured the protein so it eliminated the suspension? Adding acid to the original suspension didn't do anything because it didn't denature the protein? In strong acid, the protein is exposed to the strong acid and the ...
January 25, 2009

Biochemistry
On preparation of a solution of protein, you attempted to dissolve the substance in water, but a suspension resulted. Drop-wise adition of NaOH solution, with stirring, eliminated the suspension. Addition of acid to the original suspension had no effect. Think about how pH ...
January 25, 2009

DrBob
How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!! ------------------- I still don't understand-- I know Lucas Test is best for tert carbocations but 2-propen-1-ol gives secondary carbocation at best even with rearrangement? Is ...
January 24, 2009

Chemistry
How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!!
January 24, 2009

8th grade pre algebra
Assign a value to t as long as that value keeps the statement true, then it is correct. t in this would be anything greater than -9 to solve it it would look like: t+6>-3 -6 -6 t>-9
January 19, 2009

Biochemistry
Thank you, I understand all of it but I'm not sure how I'm supposed to know what the pKa is
January 17, 2009

Biochemistry
Calculate the pH that would result if 0.40mL of 1.50 M HCl is added to 12.0 mL of a 0.065 M solution of the fully deprotonated form of the tripeptide glu-asn-leu. I know I'm supposed to do an ICE table... and the equation will look like this initially: deprotonated + HCl...
January 17, 2009

Math 30 Pure
Shouldn't it equal zero anyway because what does Y equal?
January 12, 2009

Titration
Which of the four solutions (all same concetrations, same volume) requires: a) the greatest amount of base for complete titration? b) the greatest amount of base to titrate to any given pH? HCl, acetic acid, formic acid, HNO3. i put HCl for both... is that correct?
January 11, 2009

Dr Bob
What is the pH of the solution that results from mixing 5 ml of 0.2 M NaOH and 100 mL of 0.05 M lactic acid? (Pka of lactic acid= 3.86) Responses Use the Henderson-Hasselbalch equation. The mixture you have indicated will react to form a buffer, the base will be the sodium ...
January 11, 2009

Biochemistry
What is the pH of the solution that results from mixing 5 ml of 0.2 M NaOH and 100 mL of 0.05 M lactic acid? (Pka of lactic acid= 3.86)
January 11, 2009

math
oh i see thank you
January 6, 2009

math
you and a friend are collecting leaves.In your collection of 45 leaves, 4 are oak leaves. In your friend's collection of 36 leaves, 3 are oak leaves. Whose collection has a greater fraction of oak leaves? how do i convert it into a fraction?
January 6, 2009

Chemistry
BrO3- + 5Br- + 6H+ <--> 3Br2 + 3H2O If 25.0 ml of 0.200-molar BrO3- is mixed with 30.0 ml of 0.45-molar Br- solution that contains a large excess of H+, what is the amount of Br2 formed, according to the above equation? The answer is 0.00810 moles but I don't know ...
December 16, 2008

Calculus
i think u forgot to add the 2x^3 to the antiderivitive for the fundamental theorm step
December 16, 2008

Calculus
your right im sorry, i was thinking we were rotating around x=3 lol but will you do it so i can check my answer?
December 16, 2008

Calculus
No it wouldnt be the same because one is a disk rule one is a washer rule
December 16, 2008

Calculus
washer method!? Find the volume of y=x^2+3, y=3, between [0,2] around y=3
December 16, 2008

Calculus
Using the Disk Method or washer method (im not sure which one) Find The volume of y=x^3 , y=1 , x = 2 revolving around the X axis
December 16, 2008

math
Rearrange and simplify for x when y= mx+b
December 10, 2008

math
thanks mark
December 10, 2008

math
Rearrange and simplify for b when A= 1/2 bxh
December 10, 2008

Biology
I just need somebody to explain in plain english what "Immune Modulation" is. Google doesn't help at all, it just directs me to bunch of science research papers!
December 9, 2008

Biology
What is the difference between type I and type II immune response?
December 8, 2008

History- WWI
Does anyone know about the Canadian Stormtroopers?? I heard during world war 1 Germans named the Canadians "Stormtroopers"- Who were they? Some links would be helpful! Thanks
December 8, 2008

english
thanks for the help (haha dad i was right!)
December 6, 2008

english
is superiority an emotion? - The feeling of superiority
December 6, 2008

bio
the nucleolus would be the head office or something that controls the whole thing
December 4, 2008

Chemistry
you increase the atomic number but i don't know why I think because the atoms gain more electrons the higher they go on the periodic table
December 4, 2008

science
the spraying of pesticides may kill the mosquitoes but the remaining mosquito that survive the chemical grow an immunity to the pesticide causing them to grow a gene that prevents the insect to die to the pesticides Also when the pesticides reproduce they create new mosquitoes...
December 4, 2008

9th grade chemistry
the 2 in the chemical equation means that the element contains more than 1 Hydrogen atom Example H20 = Water 2 hydrogen and 1 oxygen molecule
December 4, 2008

English
okay thanks I was really stuck with that one XD
December 4, 2008

English
okay but what i'd like to know is why is it important for someone to be able to interact in society, don't they think that they feel happy enough???
December 4, 2008

English
Question : Matthew Antony, Grant’s former teacher tells him, “What do you know about life?” He tells him, “ You have to go away to know life.” – What does this mean to you? I need some pointers to help me answer my question... (like extra ideas)
December 4, 2008

Biology
the nucleus would be like the head office (or something that controls the whole thing)
December 4, 2008

Chemistry
what are the order intermolecular forces according to strength??
December 2, 2008

social studies
Can anyone answer any of these questions....? I'm not very associated with the Chicago area.. - What site is near or at the Chicago River today? - How is the area from Lake Michigan to the Chicago River important today? What was the problem with the area in the 1830s and ...
November 18, 2008

Chemistry
Why does the reaction of 2-bromo-2-methylbutane and ethanolic solution of silver nitrate interfered by the presence of water in the sodium iodide in acetone reagent? (Substitution chemistry) Thanks for any help!!
November 16, 2008

english
In grade 11 and trying to understand this poem which the teacher gave very little explanation for, telling to "interpret the poem for yourself" The poem is called Bushed and is written by Earl Birney. He invented a rainbow but lightning struck it down shattered it ...
November 11, 2008

math
How to convert -1.7 into fraction thanks
November 11, 2008

math 8th grade
negative one and two tenths minus 5 tenths
November 11, 2008

the subject is science
thanks
November 11, 2008

8th grade
Can we obtain water from milk, vinegar & ink. What are the steps how to do it Thanks
November 11, 2008

Math
The per capita public debt (in thousands of dollars) of the United States for the years 1940 to 1990 appears below. Create a scatterplot and determine a trend line. Based on your scatterplot, what do you expect the per capita public debt to be in 2020? Year-1940 1950 1960 1970...
November 10, 2008

7th grade
There isnt one
November 9, 2008

Chemistry
What is the balanced equation for the preparation of cis-1,2-cyclohexanediol???
November 5, 2008

Chemistry
Please help!! It's due tomorrow morning!!!!! --Why is it necessary to use a mixed aqueous-organic solvent system for the oxidation of cyclohexENE?
November 4, 2008

Calculus
If the tolerance on the volume of a cube is a 2% error then what should the tolerance be fore each side? So what i did was V=x^3 dV = 3x^2 dx dV/V = 2% What should I do next? the answer is 2/3% but I don't know how it works. Thanks.
November 3, 2008

ap biology
what is difference between blending patterns of inheritance and particulate patterns of inheritance?
November 2, 2008

11th grade
what is difference between blending patterns of inheritance and particulate patterns of inheritance?
November 2, 2008

Math riddle PIZZAZZ Worksheet
he was jumping for joy
October 30, 2008

Chemistry
I'm so confused!!!!!!!!!! I need to write out the equation for the reaction between (+)-tartaric acid and (+_)-1-phenylethylamine. I know tartaric acid is C4H6O6 and 1-phenylethylamie is C8H11N. Where do I go from here?
October 27, 2008

Spelling
Sorry, another quick question... u is a vowel, so shouldn't there be a "an" before it?/ For example: "Distress is not an universal association..." However, microsoft word keeps correcting me to say "a" instead.
October 26, 2008

Grammar
thank you!!
October 26, 2008

Grammar
Which one is correct? "There are studies and research that supports categorizing obesity as a mental disorder..." or "There are studies and research that support categorizing..."
October 26, 2008

CHEM
1.46,1.98
October 24, 2008

Phyics
A rubber ball with a radius of 4.8 cm rolls along the horizontal surface of a table with a constant linear speed v. When the ball rolls off the edge of the table, it falls 0.83 m to the floor below. If the ball completes 0.68 revolutions during its fall, what was its linear ...
October 19, 2008

chemistry
it means that salt is made up of different stuff then the things that you use to make it.
October 13, 2008

English
A question on "The Lottery" by Shirley Jackson ? I am writing an essay explaining how the use of literary devices creates a sense of horror. I wrote down things like "withheld knowledge" (that the author not telling readers the "prize" of the ...
October 12, 2008

science
this is the blank word
October 7, 2008

science
This is because the energy from the sun is __________ the water up. Is this heating?
October 7, 2008

Calculus
how do i find dy/dx of y = (x^3-1)/cos(x) do I start with (x^3-1)*cos(x)^-1 ? Thanks!
October 4, 2008

social
in the pacific northwest
October 3, 2008

social
i mean chinook salmon
October 3, 2008

social
what is the season that salmon return?
October 3, 2008

science
search mold in wikipedia
October 3, 2008

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