Homework Help

This is basically a true or false statement. If it is false, I am supposed to rewrite a correct statement: Osmosis will not take place if a dead cell is placed in a solution hyotonic to its contents. I am aware of what osmosis is and I also know that a cell in hypotonic solution will expand due to the lower solute concentration outside of the cell. However, I am not aware if dead cells are able to go through osmosis nor can I find information regarding dead cells and osmosis anywhere. Thanks for any help

I don't know how to do this:embarass:, can anyone explain a bit, please? Thanks a lot for the help! The transformation shown below can be accomplished in TWO reaction steps. From the following list, select the two reagents (or sets of reagents) which would most effectively bring about this conversion. Reagents: 1. Conc H2SO4/heat 2. CN- 3. KMnO4 4. (i) CH3MgI (ii) H3O+ 5. PBr3 6. (i) BH3 (ii) H2O2 7. CH3CH2O-/CH3CH2OH 8. H2O/H+ 9. OH-/H2O 10. (i) O3 (ii) Zn 11. NaBH4 12. HCl 13. KI 14. Na 15. CH3CH2Br Please enter the reagent number (from the above list) for each of the two steps in the following synthesis: Step 1: Step 2:

I'm working on a genetics assignment for uni and need some help to get me on the right track. It is about crossing Drosophila flys with veinless wings, forked bristles and a yellow body. The question is - Indicate whether the cross is (i) mutant females with wild type males, (ii)mutant males with wild type females or (iii) both(ie a recipricol cross), to produce an F1 generation that will enable you to determine if the traits are dominant or recessive and if they are sex linked. Draw mating diagrams and punnett squares to support your answer. As far as I can work out I think I need to be doing a recipricol cross? Can someone explain how this cross works to me I thin…

How do I differentiate this? (x^2-3x+2)(sqrt x) What i did was this: (x^2-3x+2)(1/2x^-1/2)+(2x-3)(sqrt x) But what is the next step?

Tomorrow my school will be having final test. And this question is not for homework actually but there's something I don't understand for the test tomorrow. The question I would like to know is about formula of Volts, Ressistance and Ampere. This is the sample question I'm confused with: -What is the meaning of the term 'equivalent resistance'? I want to know how to find resistance in a circuit, or to find their potential different and current. Thank You for the help, I'm new here.

Plz help i just dont knwo how to solve it i just want a little help.thz Water at the rate of 68kg/min is heated from 35 to 37 C by oil having a specific heat of 1.9kj/kg C. The fluids are used in a counter double pipe heat exchanger, & ayhe oil enters the exchanger at 110 C & leave at 75 C/.The overall heat transfer coefficient is 320 W/m^2 C. Calculate the heat exchanger area. Answer is 15.82 m^2

This is actually a project, but.. I have to make a small self contained ecosystem modeling the chaparral biome, and once I set it all up I leave it sealed for 3 days before adding organisms, then I can go ahead and add the organism but seal it once again for 2 weeks. I know chaparral is kinda an inbetween of grassland and desert and is generally the result of destroyed forest so it has poor soil, and during most of the year it is pretty dry. So what are some suggestions of autotrophs I can place and let grow and in these poor conditions? And would I need to add any insects(I want to avoid large animals) or bacteria to keep stable cycles like water/carbon/nitrogen/p…

okayy. so im doing this project for my planets and moons class at school, and i am supposed to type a two page report about a "creature" of my choice to live on any planet. i chose the planet URANUS. im trying to figure out how my creature can breathe on the the planet Uranus. I know that there is methane hydrogen and helium on the planet. Is there a way you can breathe those gases? or are they perfectly okay to breathe in? will they even hurt you if they are inhaled?

hello, if anyone could help me with these biochem problems I will greatly appreciate it! a) if you magnify a cell 10,000 fold, how big will it appear if the the is eukaryotic with a cellular diameter of 50micrometers? I did 50micrometer= 5.0x10^-5m 5.0x10^-5m times 10,000= 0.5m 0.5m equals 500mm, which is the answer, but how do I solve the following parts? b) if the cell was a muscle cell, how many actin molecules could it hold, if the cell is spherical and there are no other cellular components present and actin molecules are spherical with a 3.6nm diameter. and the volume of the sphere is 4/3(pi)®^3. I did 3.6nm/2= radius= 1.8nm=1.8x10^-9m the 50micro…

Using various inbred strains of mice, design an experiment to determine the importance of the three classes of MHC antigens in graft rejection. Include results and interpretation of the results in your answer. I am having some problems with this help would be appreciated. Thanks!

Using various inbred strains of mice, design an experiment to determine the importance of the three classes of MHC antigens in graft rejection. Include results and interpretation of the results in your answer. I am having some problems with this help would be appreciated. Thanks!

The drift velocity is directly proportional to the current in the conductor. If electrons have a drift velocity of 1.6*10^-4 m s^-1 for a current of 10 A in a certain conductor, what would be their velocity if the current was 5.0 A? What is drift velocity by the way? Any help on the above will be appreciated!

Hi. I need to draw a diagram to show the process of alloying any two metals.

Hello, everyone. This is my first post. I'm having trouble with a problem from my general chemistry homework. Everytime I work it out, I end up with a ridiculously large pressure. Any suggestions will be greatly appreciated. The problem is written as follows: In the "Methode Champenoise," grape juice is fermented in a wine bottle to produce sparkling wine. The reaction is C6H12O6(aq)---> 2 C2H5OH(aq) + 2 CO2(g) Fermentation of 750. mL of grape juice (density=1.0g/mL) is allowed to take place in a bottle with a total volume of 825mL until 12% by volume is ethanol (C2H5OH). Assuming that the CO2 is insoluble in water (actually, a wrong assumption), what …

Ok im studying just because I want to learn all about well everything,a nd Ive started with some chemistry. Im working through atomic structure at the moment, and i am really puzzled by one part of it, and after browsing the net for ages I cannot find an answer for this. with sub shells I've noticed that the 4s energy level is filled before the 3d energy level, I want to know why this is, and also if there is a formula for working out which energy levels get filled before others. because Having 4s filled before 3d is confusing enough, but when I start getting into the f orbital equations and i think that 4f comes above 5s ect it all gets very tricky for me to work out…

After browsing a few pages looking for a definition of the word Mole I cannot find one which is similar to the last definition I found. Could someone tell me what A Mole is. Also here is a sentence in my chemistry book that uses the word and I don't understand what any of it means. "The first Ionisation Energy of an element is the energy required to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions." Also, what's a gaseous atom?

Hi, can someone help me with solving this thing? I'm at the exam at the mo, stuck on this one... thank you!

Hello all, I need an advice with this code: function G=fotf(a,na,b,nb) if nargin==0, G.a=[]; G.na=[]; G.b=[]; G.nb=[]; G=class(G,'fotf'); elseif isa(a,'fotf'), G=a; elseif nargin==1 & isa(a,'double'), G=fotf(1,0,a,0); else, ii=find(abs(a)<eps); a(ii)=[]; na(ii)=[]; ii=find(abs(b)<eps); b(ii)=[]; nb(ii)=[]; G.a=a; G.na=na; G.b=b; G.nb=nb; G=class(G,'fotf'); end Syntax is : G=fotf(a,na,b,nb) its not my own this give an error : ??? Error using ==> class The CLASS function must be called from a class constructor. Error in ==> fotf at 9 G.a=a; G.na=na; G.b=b; G.nb=nb; G=class(G,'fotf'); Anyone know what is wrong will be a great help, th…

If the average man is 175 cm tall with a variance of 6 cm and the average woman is 168 cm tall with a variance of 3cm, what is the probability that the average man will be taller than the average woman? What is the probability that the average woman will be taller than the average man? What is the probability that the average man will be shorter than the average woman? If the average woman has an IQ of 101.41 with a standard deviation of 13.55 and the average man has an IQ of 103.08 with a standard deviation of 14.54, what is the probability that the average man will have a higher IQ than the average woman? What is the probability that the average woman will have a hi…

A roller coaster freewheels down a frictionless track from rest a height h above the ground. At the bottom the track becomes a vertical loop with diameter 2a = 16m. How high above the ground (value of h) must the roller coaster start if it is to reach the top of the vertical loop without lifting off the track? The given answer is 20m. I would have thought that the roller coaster needs to start at a height equal to, or slightly more than, the diameter of the vertical circle at the bottom. Energy at start = energy at end, therefore mgh = mg2a, and h = 2a = 16m. Please help me understand why it is not so. Thank you in advance

A bead slides down the surface of a sphere. Ignoring the initial speed of the bead, define the normal force between the bead and the sphere with respect to the angle of displacement. Given Answer: N = mg(3cosL-2) , L is the angle between the bead and the vertical taken from the centre of the sphere. My answer was N = mgcosL. I don't see how the given answer could have been derived.

The question is The dissociation constant of water is 10^-14, explain what this means using a chemical equation. Heres how I'd answer this. The dissociation of water into the ions H3O+ and OH- is in dynamic equilibrium. The concentration of H3O+ and OH- ions present in 1L of water is said to be 10^-7 each and since Kw = [H3O+][OH-] / [H2O]. Do I even need to say all that bullshit or would I get away with writing [H3O+][OH-] / [H2O] [H3O+] = 10^-7 [OH-] = 10^-7

Heres the question Calculate the heat of formation of methane from the following data: C + O2 CO2 DH = -393kJ/mol H2 + 1/2O2 H2O DH = -280kJ/mol CH4 + 2O2 CO2 + 2H2O DH = -895kJ/mol This is not homework its the kind of question that will be on the test so I need to know how to do it. I know what Hess' law is but I just have no idea how to go about solving this. I'm assuming the final reaction can be reversed and it will be endothermic with a DH of +895kJ/mol but apart from that I'm lost.

My task is to design an experiment to answer the question: How does the force of attraction between 2 bar magnets depend on the separation of the bar magnets. I need to write a method beforehand as we are getting marked on how we conduct the experiment but I'm really confused. I tried looking up the experiment but cant find the method I would need when using these materials. Stand and Clamp Newton meter Bar magnet (x2) Blu-tack Masking tape Ruler Does anyone know the best possible method for this experiment while using these materials? Merged post follows: Consecutive posts mergedDon't worry about this. I figured it out.

Hello, I am writting a report for my teacher and need to know a simple question. When the virus penetrates the cell and releases its RNA or DNA, does the cells ribosome's then build new protien parts, using the cells machinery. Or does the virus inject its own molecular machines? thanks a bunch:-)