# Posts by andrew

Total # Posts: 1,166

**Biology**

Where do tertiary base pair interactions largely map onto the three-dimensional structure of tRNA? What is their purpose?

**Biology**

Devise an experiment, based on sucrose gradient sedimentation, that would demonstrate that proteins are synthesized on polyribosomes.

**Biology**

What is the difference between enterocolitis and gastroenteritis?

**4th grade**

my son's homework asked to find each product by factoring the tens on 6x2, 6x20, and 6x200 and to draw rectangles if he needed to. I'm not unerstanding

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 11 m/s. The cliff is h = 55 m above the water's surface, as shown below. How long does it take for the stone to fall to the water?

**math**

equations....4 pennies=4pennies;multiply both sides by 7

**Math**

Find the definite integral of the following using a suitable substitution: 1) (x^2)/sqroot(x^3-1)dx 2)xe^(x^2)dx 3)(ln(x))^(7/2)/(x)dx

**Math**

Find the definite integral of the following using a suitable substitution: 1) (x^2)/sqroot(x^3-1)dx 2)xe^(x^2)dx 3)(ln(x))^(7/2)/(x)dx

**English**

Is this sentence grammatically correct? I would someday like to be half the man my father is.

**physics**

It's because, you the equation is 1/2(K)(x^2) So you change the cm to meters, and then you subtract, getting (.02) then you get (.02)^2, cuz u have to square it, Then you * by K which is 88, and then divide by 2. That gives you the SPE, (spring potential energy)

**Physics 11**

okay thanks alot guyz!

**Physics 11**

I need help on this question 79 g of water at 95 degree Celsius were added to tap water at 22 degree Celsius, and the Temperature of the mixture after all thermal energy transfer ended at 36 degree Celsius. What was the mass of the tap water? (teacher's answer key : 412 ...

**critical thinking**

I need an article from a newspaper or something published between the dats of September 10 2009 till December 4 , 2009. It must be a weak argument that has fallacies and can be refuted by counter examples. For the assignment i need to reconstruct the argument with its premises...

**science**

HOw has the artificial limb improved in efficiency over time since it started being used?

**Physics 11**

In physics we did a lab experiment that involved finding the Heat capacity. the teacher told us that we wont get an exact answer. He wanted us to state the Source of Error. what is a source of Error? He said that it isn't a "human stupidity error" eg. Spilling ...

**math**

3m = 18

**Algebra**

Phoebe is swimming in the ocean, 187 meters out from the beach. She screams for help and starts swimming for the beach at 0.7 meters per second. 15 seconds later Calvin starts toward her in a rowboat, going 1.6 meters per second. Let x be the number of seconds since Phoebe ...

**The secret of gumbo grove**

what is a summary for this book? Answer as soon as possible!!!!!!!!!!!!!!!

**MATH**

MICHAEL(M) IS 1 YEAR OLDER THAN TWICE HIS BROTHER GREGS AGE. IF GREG IS G YEARS OLD, WRITE AN EXPRESSION FOR MICHAELS AGE

**Science**

What would be the origin of endosporeforming bacteria in pepper and other dried foods such as oregano? and.. How would a high number of endosporeforming bacteria in pepper affect the quality and other prepared and vacuum-packaged ready-to-eat foods? I know what ...

**Grammar**

Does this make sense? "I think moms are the best kinds of people"

**math**

the Area of a parallelogram is 60ft2 the height is 5ft how long is the base

**Biochemistry**

The pH of arterial blood is 7.42. When 10 mL of the blood is acidified, 5.91 mL of CO2 is produced. 1) what is the total concentration of CO2 in the blood [CO2]+[HCO3-]? The experimental value for the volume of one mole of CO2 is 22.26 L/mol. 2) What are the individual ...

**Biochemistry**

A person during a 24 hour period produced 1.40 litres of urine containing phosphate at a total concentration of 0.0440 M, at a pH of 6.00. This urine was made in the kidneys by acidifying the phosphate in the glomerular filtrate, which had a pH of 7.40. How much acid must be ...

**science**

I have two questions. I'm doing a crossword puzzle and this is the question. "sometimes scientist make a mistake or ___and need to do the experiment again." The answer is 5 letters and the second to last letter is an O. The second question is "After the ...

**gr. 8 math**

skylar wants to join the local gym. the cost in dollars for a membership can be expressed as: 100+39.99m where 100 is the initation fee in dollars, 39.99 is the monthly fee in dollars, and m is the number of months for which a person signs up. How much will it cost skylar to ...

**algebra 1**

-2/5-7/10

**algebra 1**

2-(-9)

**10th grade English**

This is my intro for my Julius Caesar essay. _____ represents different characters and qualities in the play. Please check any mistakes or awkward phrases thanks Julius Caesar, written by William Shakespeare during the Elizabethan era, is one of the most well-known plays even ...

**Math**

Bridget has a limited income and consumes only wine and cheese; her current consumption choice is four bottles of wine and 10 pounds of cheese. The price of wine is $10 per bottle and the price of cheese is $4 per pound. The last bottle of wine added 50 units to Bridget's ...

**10th grade English**

Well, it is not quite English.. But it is an essay on my science project. I was wondering if I could get some help on grammar or awkward phrases. Please fix any mistakes in it ASAP.. Asthma, a multi-factorial disease, is caused by family heredity, which is, passed on from one ...

**SAT**

Is a 480 for math bad? Would the 660 I got on reading componsate for this?

**Journalism**

For my article, I have to look up a company's old address. Is there a website that has archives of the phonebook online? Thanks so much.

**writing essay english**

can you help me to revise this please? The book focuses on nursing through Sue Bauer's life as a patient, grabbing the reader's attention with her experiences and heartfelt thoughts. That's how this book provides an interesting chance to gain perspective, since ...

**8th grade**

n+3=12

**ALGEBRA**

Thanks Reiny

**ALGEBRA**

how can i graph the inequality 4x+5y is greater than or equal to 20 in a plane? #2 Please help to graph the system of inequalities y is less than or equal to -5 and x is less than or equal to 6 just finishing up an assignment thnaks

**Social Studies**

How did wheat help the U.S. gain wealth and power in the world?

**spanish**

Answer affirmatively ?saludo vd al maestro al entrar en la clase? Si, ...

**10th grade Enlish**

This is my To kill a Mockingbird essay. Please have a look and fix any mistakes or awkward phrases ASAP Thank You Written by Harper Lee, To Kill a Mockingbird is a novel set in a fictional town of Maycomb during the 1930s. In this novel, Lee uses two main characters, Jem and ...

**math**

what is 9*x+6-r+y*p=100

**Allied Health**

Under HIPAA, which one of the following statements is true regarding the release of PHI by covered entities to business associates? A. Covered entities are responsible for the use of PHI made by business associates. B. Covered entities aren’t allowed to release PHI (...

**Allied Health**

A woman in one state is suing a woman in another state for $25,000. Which one of the following statements is accurate regarding the jurisdiction of the court in which the case was filed? A. The court can exercise personal jurisdiction over the nonresident. B. The court has ...

**health**

The answer is D thanks Ms. Sue

**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!

**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!

**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.

**Chemistry**

Never Mind

**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?

**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....

**Chemistry**

Thank you so much! I was trying to work with wrong E_cell

**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...

**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...

**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?

**Science**

the answer is D

**earth scince**

What process is mainly responsible for shaping Earth's land surface

**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...

**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 ...

**math**

how to convert a fraction to a decimal? 3 - 5 1/50

**math**

how to convert a fraction to a decimal

**Biochemistry**

Is the substrate level phosphorylation (of succinate) spontaneous under conditions that exist in the mitochondria?

**Biology**

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

**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 ...

**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...

**bible charater**

500 begins it 500 ends it 5 in the middle is seen first of all letters first of all numbers

**government**

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

**ecology**

what causes the buildup of a river delta

**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??????? ...

**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...

**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...

**Chemistry**

Thanks for your help!!

**Chemistry**

So since the vapor pressure of water is 23.8 torr p = 0.99 * 23.8 p = 23.6 is this right?

**Chemistry**

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

**Math**

what dose sea level mean in math :()!

**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

**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 – ...

**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 ...

**Biochemistry**

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

**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 ...

**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 ...

**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 ...

**Chemistry**

How would i explain the readiness of allyl alcohol to react with the Lucas test???? Thanks!!

**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

**Biochemistry**

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

**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...

**Math 30 Pure**

Shouldn't it equal zero anyway because what does Y equal?

**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?

**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 ...

**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)

**math**

oh i see thank you

**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?

**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 ...

**Calculus**

i think u forgot to add the 2x^3 to the antiderivitive for the fundamental theorm step

**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?

**Calculus**

No it wouldnt be the same because one is a disk rule one is a washer rule

**Calculus**

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

**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

**math**

Rearrange and simplify for x when y= mx+b

**math**

thanks mark

**math**

Rearrange and simplify for b when A= 1/2 bxh