Homework Help

1. How many different ways a DNA molecule could be altered? 2. How misincorporation of a base is corrected during DNA synthesis? 3. Describe the repair mechanism of DSB (double strand break) and how BRCA TSG participates in this process? 4. What are the error prone enzymes and why they are needed or not needed for DNA repair process? 5. What are the protective measures taken by normal cells to repair altered DNA molecules in a DNA strand? 6. What are the different steps of tumor cell invasion and metastasis? Describe in detail. 7. What are the architecture of cells and other components in a tissue and how cells remain adhered within the tissue?…

I have one question,that i can't find a solution to.So if someone can help,i ll be really grateful! Q-A Circular loop of radius 20 cm carries a current 10 A.An electron crosses the plane of the loop with a speed of 2.0 x 10^6 m/s (2 into 10 to the power 6 meters/second).The direction of motion makes an angle of 30 degrees with the axis of the circle and passes through its centre. What is the magnitude of the magnetic force on the electron at the instant it crosses the plane? Thanks in advance!

The power series converges for all , say to . Let be the power series expansion of about . Prove that for all positive integers . Help would be much appreciated.

How would a person go about doing the following in the simplest way possible?: [matrix1] ^ [matrix2] = [matrix3] ? Thank you.

I'm doing an experiment to measure the light absorbance of bromophenol blue? (spectrophotometry) i have 5 test tubes: 1st) 1ml BB and 4ml H2O 2nd) 2ml BB and 3ml H2O 3rd) 3ml BB and 2ml H2O 4th) 4ml BB and 1ml h2O and the 5th) 5ml BB and 0ml H2O. max absorbency at wavelength 595 nm concentration of stock solution: 10mg/L results are: 1st tube: .332 2nd tube: .368 3rd tube: .375 4th tube: .533 5th tube: .746 how can i draw a graph concentration of bromophenol blue (x-axis) and absorbance (y-axis)? then i need to find the absorbance at concentration 2, 4, 6, 8, 10? please…

Please, Guys. I need to know the context or concept as the case may be, of the SI standard of measurement 1: TIME 2: LENGTH 3: MASS why is time measured as a 9 192,631,770 cycles of microwave radiation. etc. Please i need an obvious and less gobbledygook kind of explanation.

Hey, I have to write a research paper on alternate energy sources for school. I was thinking of going out of the box and go with nuclear energy as a alternate energy source. Ofcourse nuclear fission is not a realistic, I already know that much about a article I read on physorg.com, but I was wondering if nuclear fusion is a valid alternative. Since this is a research paper I would prefer that you don't give me the answer or that would defeat the purpose of the research part in the assignment . I am wondering though if some one could lead me to a website that focuses on the nuclear fusion and how it is used to produce energy. I am only a high school student and we don'…

I have done a experiment testing the ethanol content in a white wine sauce after different cooking periods by titrating it and have gotten odd results. The sauce contained a cup of 13% alcohol volume wine and a cup of chicken stock and an onion. It was prepared and frozen until I was ready to test it. When I tested it my 0 minute cooking time sample (the one the hadn't been heated at all) got a result of 2% where as i expected it to be at least 6% as I thought most of the ethanol would have still been present. Do have any idea why I might have gotten these results?

Hey guys, I'm currently in a Physiology class and we were asked to critically think about why our body has a convoluted system for creating urine. The fluid goes through multiple stages to concentrate and unconcentrate before it becomes urine. Why is it that our body doesn't have a direct system from A to B? Does it have to do something with the ions or energy conservation? Appreciate your help. Thanks

Two cars start moving form the same place. One goes north at a rate of 50 mi/hr, while the other heads east at a rate of 30 mi/hr. At what rate is the distance between the two cars changing exactly two hours later? I thought that the equation for the velocity vectors is: r(x) = 30xi + 50yj and thus distance d two hours later is given by: d = √(30x² + 50x² ) and dd/dt = ∂x/dt + ∂y/dt and after solving the equation I just plug in 2 for x and y to get what time the distance changes at the two hour mark. Is this right?

I've started reading Sid Morris's Topology Without Tears and I'm stuck. Here's the exercise: Let R be the set of all real numbers. Precisely three of the following ten collections of subsets of R are topologies. Identify these and justify your answer. T1 = R, {} and every interval (a, b), with a, b any real numbers. T2 = R, {} and every interval (-r, r) with r any positive real number. T3 = R, {} and every interval (-r, r) with r any positive rational number. T4 = R, {} and every interval [-r, r] with r any positive rational number. T5 = R, {} and every interval (-r, r) with r any positive irrational number. T6 = R, {} and every interval [-r, r] with r any po…

<div>My teacher gave us an assessment to do and I encountered some problems. Would be glad if you guys can help.</div><div><br></div><div>1. Why is it that a cup with lesser amount of water produce a lower pitch sound as compared to an identical cup with more water when hit with a stick. (And vice versa)</div><div><br></div><div>2. Sound energy is produced by vibrations of air particles right?</div>

koniecznie zobacz DOMINIQUE STRAUSS-KAHN’S apprehension in May on charges of attempted sybaritic irk and propagative debauch dealt such a frighten that French parade went into a magnificence of suspended animation. This week, in concordance so, the countdown to the 2012 presidential referendum seemed to rise in the world on real. Two contenders articulate in their names on the Socialist nomination. France got a unorthodox accounting proselytizer, after Christine Lagarde was picked to on Mr Strauss-Kahn as IMF boss. And President Nicolas Sarkozy launched a unequalled supplicate agonize to rebuild France. http://www.minergie.fr/forum/viewtopic.php?f=16&t=252 h…

I have a science project and I have decided to find out if the amount of energy (joules) produced when combustion of hydrogen gas in air takes place. I need someone to check if there are any problems, and here is what I worked out: Volume of Hydrogen gas (H2)collected: 51.2cm3 = 0.0000512dm3 No. of moles of H2= Volume/Molar Volume = 0.0000512/24 (at rtp) = 0.00000213mol Enthalpy of Combustion forHydrogen: -286 kJ/mol Energy produced: 286 kJ/mol x 0.00000213mol = 0.00060918kJ (H2) I'm also comparing it w…

What is the atmospheric pressure of helium ? When using Boyles law calculator http://www.endmemo.com/chem/boyle.php it is required that we know the atmospheric pressure of helium ? By calculating the volumes of pressurized helium within following cylinders I have found the atmospheric pressure to be approximately 1.47 Bar. Cylinder 1 150cm x 11.5cm Radius - contains .0035m3 of helium @ 200 Bar therefore the initial volume should be 1.37 Bar Cylinder 2 33cm x 5cm Radius - Contains .0025m3 of helium @200 Bar therefore the initial volume should be 1.42 Bar Cylinder 3 91cm x 7cm Radius - Contains .0149m3 of helium @200 Bar therefore the initial volume should…

hi everyone im doing my science fair on "do essential oils inhibit oral bacterial growth?" im testing tea tree oil , eucalyptus, cinnamon, clove , orange and some others my method (i know its kinda lame) -swab teeth -streak onto agar plate -add 0.5 ml of essential oil to the centre of the agar plate -incubate -measure zone of inhibition but my sister suggested this method : -mix 2.5 ml saliva with 2.5 ml sterile water -dip swab into this solution and streak agar plate -using a straw, cut out a circular piece of the agar, forming a well -using a dropper , fill the well to the top with essential oil -incubate -measure zone of inhibition which metho…

I am practicing my ability to come up with logical arguments. so any feedback on this one would be much appreciated. 1). God couldn't make the Universe while being inside it. 2).Therefore God had to be outside it. 3).Nothing can exist outside the Universe, therefore God doesn't exist. Clarification will be provided upon request. Thanks!

I have to name the two variables in the following hypothesis... Homeless women are subjected to more spousal abuse that are housed women. I initially thought it was homeless women and spousal abuse...However, now I'm thinking the 2 variables are homeless women and housed women because thats the characteristic on which the two variables differ... Can someone point me in the right direction?

hi.. i would like to know why C-12 was used as a reference for measuring atomic mass, other than being the most abundant isotope of carbon.. if any of u know the reason please let me know

People, now i'm doing research project on aluminium..so i need do the electrolysis to coating my sample (aluminum)..the electrolysis is using copper(II) sulphate solution, copper pipe (anode) and my sample aluminium (cathode).so now,i want to know how to know and calculate the thickness of copper deposited on my sample..if say..i use the 0.6A DC electrical current in 2 hours..so how to calculate the thickness..or use the faraday's formula... (can someone explain,because i totally confuse and blur)thank you

I'm stuck on a homework question: Show how the following solution set: [x1,x2,x3,x4,x5,x6,x7,x8]^T =[1,-1,0,0,0,0,0,0]^T, [0,-1,1,0,0,0,0,0]^T,[0,0,0,1,-1,0,0,0]^T,[0,0,0,-1,0,1,0,0]^T,[0,0,0,0,-1,0,1,0]^T,[0,0,0,0,0,-1,0,1] is obtained from the two linear equations x1+x2+x3-x4-x5-x6-x7-x8=0 and x4+x5+x6+x7+x8=0. The two equations can be put into a matrix A= [1,1,1,-1,-1,-1,-1,-1,]; [0,0,0,1,1,1,1,1]. Then row 2 is added to row 1 and the following solution is obtained (where v1, v2, .. v6 are arbitrary values) x1=-v1-v2; x2= v1, x3=v2, x4= -v3 -v4 -v5 -v6; x5=v3; x6=v4; x7=v5; x8=v6. But this corresponds to a solution set different than the one provided …

. I really need help in answering the two questions stated at the end of the quote below: I'll be really grateful to anyone who can help. Thanks in advance. Edit: I'm not sure whether I put this in the right sub-forum. If I didn't, I hope the mods will move it to the appropriate section. .

1) Place 1 cup (236 ml) of water in each of the 4containers. 2) In 2 of the containers, add 1 tablespoon (14.8 ml) oftable salt and mix well. 3) Measure the length and width of a raisin and place itin 1 of the plain water containers. Measure the length and width of a secondraisin and place it in one of the salt water containers. 4) Measure the length and width of a grape and place it inthe second of the plain water containers. Measure the length and width of asecond grape and place it in the second of the salt water containers. 5) After 1 hour, remove and measure the length and widthof each piece of fruit and return it to the appropriat…

Honestly speaking, what can we personally do to help ensure water substainability, apart from the usual wasting less water and not polluting water bodies by dumping litter into them? As much as this is an assignment given, I too have interest in discussing on this topic. Seems interesting enough. I believe we can do a lot more to ensure water sustainability. Thoughts?

the question goes 3^(x+1)=6 i tried it like this 3^(x+1)=3^x.3^1 3^x=6/3 3^x=2 then im stuck... anyone can teach me? not asking for answer only..but with tutorial..and how do people do superscript and subscript in the forum?... The Next Question Goes like this 4^x=1/32 This one i tried it this way but i know im wrong.. =.= 4^x=1/32 4^2.5=32 4^-2.5=1/4^2.5 which equal too 1/32 [yes im wrong].. so x=-2.5 [wrong answer] help pls.. sincerely A.Munsif