Homework Help

Hi all, I'm currently doing an essay on the theories of colour vision (using the trichromatic and opponent theory). However, I'm having so much trouble understanding the opponent theory and how it actually functions. I'm wondering if anyone could shed some light on this? How can the opposing theory be explained and how could I propose a conclusion and evaluation of both theories? It's driving me crazy trying to get my head around it. Some ideas would be much appreciated. Many thanks, Evnissyen

What enzymes are involved in the following reactions A) lipid hydrolysis B) gelatin hydrolysis C) cellulose hydrolysis D) urea hydrolysis E) tryptophan hydrolysis JUST TO MAKE SURE IF IT'S CORRECT OR NOT: A) lipase C) cellulase D) urease

Hello. I am having trouble with a question in my textbook. If I have an 8.3 g sample of acetanilide (Solubility => 0.53g/100mL at 25oC and 5.0g/100 mL at 100oC) that needs to be purified by recrystallization, then what is the maximum % yield that can be recovered (10% excess of solvent was used)? I'm confused as to how I go about such a question, so if you could, please, hint at what path I am supposed to take, I'd greatly appreciate it.

I don't think I'm giving all the information in this homework problem, but I don't want to have the problem solved for me. I just need to know where to start. We were given the data for enzyme assays and all we have to do (in one to two sentences) is to explain the data. For example in problem (f), it seems like I have to go to a protein database and look up the structures based on the enzyme code, but i'm not entirely sure how to interpret the data once the structure is in front of me......

Righto, hi there! I'm conducting an experiment to identify microbes in water. So i've been give two agar plates--- the control's in the classroom. I've chosen water as my subject, and i have to grow microbes/bacteria on them. I was thinking about pond water (found in a disgusting hole (?) at school) and normal, bottled water, most likely Mount Franklin Bottled water. So i know what to do... just applying it onto the agar plates is the bit.. D: I've read numerous methods, and they all involve THE LOOP. D: I do not possess such an item at home, and i doubt the school will lend me one... >.< So i thought, after researching some more-- why not swabs? A…

Hi all, I've got an essay to write on the activation of cell surface receptors, specifically hormones and neurotransmitters. My local library hasn't been much help, so I was hoping someone here might be able to point me in the direction of useful literature on the subject. I have a couple of books, but not enough to write 1500 words. I'd prefer to steer clear of wikipedia if possible. Many thanks in advance!

Hello, I'm writting a brand new paper to talk about "knowledge management". I have bought some papers from web, but I don't have money to buy more however I would like to read and use this (http://orgsci.journal.informs.org/cgi/reprint/2/1/88) as reference. Somebody can help me to get it or just give a way to access it as read only? Thanks in advanced

Now, this is not exactly home work, as I am at university doing my second degree, but: My name is Jana and I am a science communication student with a first degree in virology and immunology. Me and my fellow students are currently creating a radio show about stem cells, and I was wondering if I could ask your views, opinions, questions or comments on the issue of stem cells, stem cell research and the application of stem cells in medicine, so we can make the show more lively by integrating other people's views. As a scientist I am probably a bit biased towards stem cells - and I also learned a lot about them, but I would like to know what do other people know or …

Does it just happen? I just don't understand how it could be efficient enough to know that.

i need help! please. how do you find the definition for this. what is the domain, the range, and the graph? sgn(x-1) - sgn(x+1)

hi all, I've question we have human gene (with its promoter , TE , ....ect ) which code for a certain protein inserted in plasmed of bacteria , but what happen is there was no expressing for this gene !!! ... why???? -I think that may be mRNA degrated before translation by the action of nuclease enzymes. in other words, no capping or cleavage make the mRNA exposed to 3' exonuclease & 5' exonuclease. - OR may be because there is a gene control the splicing for this gene which is not transferred to plasmed. I mean there is other gene may code for protein control splicing in specific way for exons that stop the translation or produce inactive protein. …

If cells didn't have a limit to the amount of times they could divide, causing them to die, would we just live forever assuming our health was in good condition?

My question is short, how are the normal modes of stretching of C-H bonds in benzene look like? I think there are 12 of them, my thinking is: 1) s orbital of H interact with sp2 orbital of C 2) there are 6 pairs of them 3) each pair can either exist in bonding or antibonding so (A for antibonding; B for bonding): a) BBBBBB b) BBBBBA c) BBBBAA d) BBBABA e) BBABBA f) BBBAAA g) BABABA h) AAAABB i) AAABAB j) AABAAB k) AAAAAB l) AAAAAA I don't know why, but I think this thinking is wrong, please point it out and illustrate how can I figure out the number of normal mode and how they are look like when a certain molecular is given. Thanks.

f(x)=x + 4 .......x - 3 I know I need to change f(x) to y and then switch x and y. I got that far I tried to multiply both sides by (y-3) in order to solve for y, but after that I got a little lost.

Please point out where I got wrong. The question: At a sand gravel plant, sand is falling off a conveyor belt and onto a conical pile at the rate of 10m^3 / min. The diameter of the base of the cone is approximately 3 times the altitude. At what rate is the height of the pile changing when it is 15 meters high? My solution: Let V be the volume of the conical pile, and the height be h, and the radius, r. Given, dv/dt = 10. Since the diameter of the base is approximately 3 times the altitude, h= 6r, and r = 2.5 m h=6r dh/dr = 6 v=1/3 πr^2h v=1/3 πr^2(6r) v=2 πr^3 dv/dr = 6πr^2 dv/dt= dr/dt X dv/dr dr/dt= 10 / …

let f(x) be { 3-x, x<1 { ax^2+bx, x>/ 1 if it's continuous for all x what is the relationship between a and b find values for a and b that will make it continuous and differentiable i have no clue where to even start

Actually, I just have some doubts with my experiment result. The equation for the reaction, C7H6O3 + C4H6O3 -> C9H8O4 +CH3COOH I started off with 2.42g of salicylic acid (C7H6O3) which is about 0.175 mole of it. By right, based on the equation, one mole of salicylic acid should yield one mole of aspirin (C9H8O4). So 0.175 mole of Aspirin is expected at the end of the experiment. And the expected mass of aspirin should be 3.15g. But at the end of the experiment, I only got 1.1g of aspirin. Which when calculated in percentage yield, is only 34.92%. So should I presume that I made some mistake during the course of the experiment? When I asked my lectur…

Leukocytes is divided into two groups, Granulocytes and Agranulocytes. I know that the DNA is used for amino acid sequences of the proteins and enzymes. The question I would like to ask: Why do Granulocytes/ Agranulocytes have a high concentration of RNA? I also know that there are the messenger RNA (mRNA), ribosomal RNA (rRNA) and transfer RNA (tRNA). I know their functions too. But the reason is I don't really know why the Leukocytes must have a high concentration of RNA. Is it because of the white blood cell function? Please enlighten me.

Hey guys this is my first post. Im having trouble with 3 questions on my chem lab. The first question is discuss the differences in conductivity between glacial acetic acid, 6 m acetic acid, and 0.1 m acetic acid. the second question is how do organic solids and liquids rate as electric conductors.. lastly how can you account for the fair and poor conductors of electricicty.. Much help is appreciated, but only please respond if you know the answer. Thanks!

encased him in carbonite! He should be quite well protected. ... Assuming he survived the freezing process or is this person trying to sound smart? Isn't carbonite an explosive? I am confused what he is saying.

Hey this question has me stumped and I could really use some help: What is the activity of liquid water in a multicomponent system in which the vapor pressure of water is 748.2 mmHg at 100.0 degrees Celsius? That is all the information given. I think I am probably missing something obvious here, but every equation I have to find activity requires some other info, ie mole fraction or partial pressure. Any help will be greatly appreciated. Thanks, RB

Hello, this is my first time posting:-) I have a question about conversion. I'm doing grade 8 science and in my book it says that the unit of "cc" is the same as "mL". This is all the info they give me. Then I'm asked to convert this value: 100 microL to cc? I have no idea how to do this so I looked in the answer key and the answer is: 0.1mL=0.1cc. Would someone be willing to explain the how and why? It would be greatly appreciated!!!

My project is to write an essay about a boulder. I can put the boulder anywhere and I decided to put in the Four Corners. Now I have to write about what it was like for the boulder 1,000,000 years ago, 100,000 years ago, 10,000 years ago, 1,000 years ago, and present time. Can any give me some information of the Four Corners in those times? All I need is the information. I will write it out in my own words and create similes and metaphors with it. (Because it's an ELA project.) Also, when you give the information, it would have to be from a 100 meter distance of the boulder.

Question: What is the coordination number of (a) Cadmium and (b) oxygen and what are the geometrical arangment around cadmium and oxygen? Answer: cd = 4 o = 4 Question: determine the number of cadmiun and oxygen atoms in the structure, then determine the emperical forumla of the compound and the number of forumla units in the unit cell Answer: cd = 4 o = 4 emperical forumla - CdO How is the last part worked out? Question: Calculate the density of cadmium oxide Answer: Molecular weight = 128.4104 g/mol Avogadro's number = 6.0220x10^23 what is the unit cell dimesions? Is it Cd to Cd measurement?

How are they able to access different parts of it to do different things?