Homework Help

In an experiment, the rate of an enzyme-catalyzed reaction increased as the substrate concentration increased, but it leveled off after reaching a certain point. Why is there a steep slope in the beginning? why does it level off when more substrate is added? I need help with this question..i have turned my bio book inside out and i still cant find the answer..i feel like it is soo simple and i am over thinking it..any help at all is appreciated

I am trying to see if the GFP protein is used with anti-bodies to label the proteins OR something else. It says GFP can be fused to any protein of interest using standard methods of recombinant DNA. I guess that means that an antibody isn't necessary but...what is a standard method of recombinant DNA? HELP!

My bio professor said that the NH3 groups are basic because the have a positive charge. Um...that isn't the Lewis base definition. It isn't the Bronstead Lowry either. What does she mean!

Need it for an essay. Please help.

what is the meaning of uniform composition? I know that a solution or a mixture has uniform composition if all sections of it as the same properties..... a solution like pure water can be called of uniform composition because it is made up of h2o molecules throughout and that is what we find when we keep on dividing it. but a mixture like salt and water has particles of nacl in between particles of h2o. so why do we call it as of uniform composition?(as these nacl particles may be less and present between some h2o particles and present not in some others)

Hi, I'm a little confused about the term "naturally occurring amino acid". Does this refer to the chirality of the amino acid at all? Some sources say that L-isomers are the "naturally occurring" amino acids, but others seem to suggest that this is a misconception. I've been given the structure of GABA (gamma aminobutyric acid) and asked if it is considered a naturally occuring amino acid. I know that it's synthesized from glutamate, has no chiral carbon and is not a protein forming amino acid... does that mean its not naturally occurring? Cheers, rorosingsong

Which is a better definition for carnivores? 1 Organisms that eat only organisms other than plants Or 2 organisms that eat only flesh/meat Or neither? Thanks.

Hello. Please tell me how to round off repeating numbers after decimal. For example, how to round off 0.6666666666...... would it be 6.5 or 6.7? and why?

I have about 100 problems with a lot of factoring. (Difference of squares, sum of cubes, difference of cubes, etc.) But I need help on a few. First is x^3+3x^2+3x+1. What kind of problem is this...? I did some steps that I thought appropriate and ended up with... (3x+(x^2-x+1))+(x+1) If anyone can double check this that'd be great

must find the length of the arc of the curve on the given interval of x: The Curve: 24xy=x4 +48 Interval : x=2 to x=4 My solution gives a math error and i've been over and over it and I can't find my fault. I'm known too make a lot of small errors so please help me find it. you'll see at the end when I substitute 2 I get an undefined anwer(Divide by 0) I have attached my solution. Please help if you can I

please help me with this one micropropagation

Science forums is amazing, but I've noticed that there are a few websites out there that give you homework help answers to various subjects. Can anyone tell me what websites I can trust (since you've got to pay for them I'm hesitant to even surf them). It'd be really nice to have all of the answers to my homework so that when I'm stuck I can get unstuck by going online. Then if I want to discuss a problem with the community, I can do that here

Hi all, came across this question in prep for my GAMSAT exam. I've been trying to work it out, but my answers do not match up with the given answers in the book. 5.5 x 10^-7 is the given answer. I've attached the problem with this post. Can anyone verify that 5.5 x 10^-7 is correct or a mistake? Any help appreciated. edit: Ignore the graph part

COULD SOMEONE PLEASE FURNISH ME WITH A STEP BY STEP DESIGN PROCEDURE FOR A CONTINUOUS RCC SLAB,IN THE SIMPLEST TERMS POSSIBLE

I got this wrong in a test. Now I'm sitting and puzzling. The initial fraction is what the answer key said, the last, mine. What did I do wrong in: 2x/(1+4x) = (2x/x)/(1/x+4x/x) = 2/(1/x+4) = 2(x/1)+2(1/4) = 2x+1/2 When I substitute 10 for x, the answers are different. If there is a link or source, it would be very helpful too. Thanks!

I am writing a paper on our sun. Earth's. I have whipped up a short survey. I need some solid input and I came here thinking this was the place to find that. The survey is 4 questions long and your help would be appreciated and go to good use. http://www.eSurveysPro.com/Survey.aspx?id=0e4406ca-d599-4c41-bb28-c88170018536 Thanks a lot. LightShox SHARE THE SURVEY IF YOU'D LIKE.

I'm completely stumped with this question. The problem is we were never told how to do this and the method for calculating this quantity doesn't seem to be in any of the supplied course literature. Does anyone know how to do this? Can you please show me?

Hi, actually i don't know what section in this forum should i ask this kind of help. But to anyone who have direct access to Applied letter physics and also Journal of Applied physics can you PM me your email? I'm asking your kindness to help me to download several research paper which are out of subscription for my college, especially the papers in ALP and JoAP. As for exchange you can also call me for help if you have same problem. May be i can help you out if my college subscribe the papers you want. My email zulhelmialif@gmail.com thanks http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5146290&abstractAccess=no&userType=inst anyone …

Hi, I've just started studying molecular biology this semester and I'm a little stumped on a homework problem - would really appreciate some insight. I have a hypothetical hexapeptide with N-terminal Glutamine and C-terminal Arginine. The question is "If the N-terminal was acetylated how would this affect pI?" I know acetylation is the addition of an acetyl group (C2H3O), and that glutamine is a polar amino acid -- however it's uncharged at pH 7 and I can't see how the addition of an acetyl group would affect the charge of the molecule or the pI in anyway. We haven't covered acetylation in any of our lectures, so I'm really not sure about this at all. …

OK, so I have my science fair idea but I don't know how to test it. I am trying to test whether or not temperature of water changes How much CO2 will dissolve into it, and also whether or not adding substances to the water affects the same thing. However, the most scientific method of testing I can find is heating up some cola and sticking your tongue in it. Does anybody know a way I can find out how much CO2 will dissolve int water, with an actual answer in mg/l or g/l, using NON-SPECIALIST equipment? Thanks XenonPirate P.S. here is my aim ,if anyone can think of a way to actually test this and tell me ASAP it would me much appreciated. Aim …

1. Does precision describe the relationship of a measurement to an accepted standard or the limitation of the measuring instrument? to me the relationship of an accepted standard sounds more like an accuracy. what do you guys think? It's on my homework and these two are the choices. 2. How many significant figures does 40.005 00 have? Also, how can significant figures indicate precision? PLEASE REPLY

Hi! I am currently working on a research assignment about lithium. I am trying to find out how it is extracted from the earth. Here is what i know so far: In chilli, the largest producer of lithium in the world, lithium is extracted from brine (water which contains lithium salt) of the Salar De Atacma, the largest salt flat in chilli. The brine is pumped into large solar evaporation ponds. Over a 18-24 month period the brine is evaporated until there is a sufficient concentration of lithium salts. This lithium salt is then transported via truck or pipeline to processing plants where it is converted to usable salt products such as Lithium Carbonate. What i don…

1. A peptide (compound A) was hydrolysed and found to contain equimolar quantities of arg, val, tyr, glu, lys, ala and gly. (a) Exhaustive treatment of compound A with trypsin yields the following compounds: arg, ala-lys and a peptide (compound B) containing glu, gly, tyr and val. Treatment of compound B with chymotrypsin yields val-tyr and glu-gly. (b) Short-term treatment of compound A with carboxypeptidase yields free glycine as the first detectable amino acid. © N-terminal analysis of compound A with FDNB yields DNP-alanine in the ether phase extracted from the acid hydrolysate. What is the sequence of the peptide? Given this info, the N-terminal AA is…

I need to know what do they need to survive? How they die? And other basic information. Anything would be great.. Thank you

What are the methods of Base catalyised synthysis aspirin production, im having alot of trouble even finding a single method. Any methods, links or info would be great