Homework Help

I have a bit of homework that is puzzling me. There is a sheet of illustrations of cells etc, and I have to try and work out the magnification from their apparent and actual size. I have been stumped a little bit, because in one image the scale at the bottom for 0.01mm is 31mm long, yet the apparent size of the cell is 24mm, my maths is terrible and I have no idea how to translate this into its actual size when the scale is bigger than the apparent size of the image... I hope that makes sense. I'll try to clarify if it's not clear. Much appreciated Laurens

You sequence the following DNA fragment: ACT GGG CAG AAG CGG GAA CTT TGC AGA ACT G GC TGG CCT CAG AG C AGG GA) by Sanger method (dideoxy sequencing) using primer [32P]-5’- TCT GAG GCC AGC CAG TTC TGC AAA GTT C. a) Predict the band pattern after electrophoretic analysis of the products of primer elongation. b) Due to an experimental mistake you forgot to add dATP in all four reaction mixtures. How does the band pattern change? This is the problem I was giving. I worked on it for awhile and got nowhere really. I think that I don't understand what the question is asking me. How does the primer affect the band pattern?

If you hydrolyzed the dipeptide Phe-Arg and the dipeptide Arg-Phe and then analyzed the mixtures in separate lanes using paper chromatography, would there be any differences in what you observed on the chromatogram? Why or why not? Thank you

Hi, can someone help me with following homework. The inner loop of a matrix computation uses the statement For J:=K step 1 until N do A[i,J]:=A[i,J]xQ – A[K,J]; Assume that this statement is parceled out among the processors of a multiprocessor system so that each processor executes statement for a different value of J. Assume also that the multiprocessor system has a central shared memory. When two different processors access the same memory module simultaneously, the module responds immediately to one processor, and the second processor has to wait one memory cycle, at which time it repeats its request. a) Assume that the array is stor…

Find 3 Reasons why digestive enzymes are secreted as proenzymes. I now 1 reason is because enzymes would digest the cells they are secreted from.

Hello, I have a few questions in my homework and I dont know where to go to get the answers. I have looked for books on protein synthesis, biochem texts, cant find the info. Protein secondary structure questions:1. How does secreted protein biosynthesis differ from that of cytosolic proteins? From lysosomal proteins? 2. How do proteins fold? 3. What is the role of glycosylation in protein folding? 4. Where are glycosylated proteins found?

why sometimes full moon not appear at cloudless night and why in some months and not others? why filtration to seperate sand and salt show salt not seperated?

Is mgnesium chloride neutral since its a salt? Sodium hydroxide is a strong alkali?Can someone pls name a few common strong/weak acids and alkali?Having exams tmr and o lvls is coming. pls help thanks!!!

hiya. ok, so i've got an assignment that's due around 9AM EST on the 13th of Sept (this morning). If anyone could help me out before then, I'd be forever grateful =p Here's the first question: Solve for "x" 2x^3 + 6x^2 -x = 3 and so far, i have: (x+3)(2x^2-1)=0 Its a four mark question, so I have to be missing something here. The other question is: When (ax^3 - 4x^2 +5x -3) is divided by (x+2) and (x-1), the remainders are equal. Find "a" How would I go about doing this?

This problem was in a book. In the figure, angle RQS = angle RSQ and QS is the median on TR. Prove that: EP/TP = PQ/TS Our teacher said that this problem is incomplete. Also, when you draw the figure, we need angle PTS for construction. But this angle is not given. Thus, as I find, the problem seems wrong. Can you help me solve it if you know how to? Thanks.

how would one get from: (2a+3)^2 - 8(2a+3) + 12 to: [math] [(2a + 3 ) -2] [ (2a+3) - 6] [/math] i expanded the first part and got: 4a^2 - 4a - 3

Ey ppl. Here's the question: Given the the points on the graph y=f(x), find the equation of y=f(x) and y=1/f(x). Label asymptotes. Given Points: (-4,0), (-2, 2), (0,0), (2,4), (4,8), (6,0) Therefore: [math]f(x) = k(x)(x-6)(x+4)[/math] Using the local maxima (4,8), I began by solving the value of k. [math]f(4) = 8 = k(x)(x-6)(x+4)[/math] [math]8 = k(4)(-2)(8)[/math] [math]8 = -64k[/math] [math]k = 8/-64[/math] [math]k = -1/8[/math] Therefore: [math] k=(-1/8) [/math] The revised equation for f(x) is: [math] f(x) = -1/8(x+4)x(x-6) [/math] This is where I get stuck. This equation does not yield the ordered points that were given at the begi…

OK. so for my lab i needed to take the partial derivative of the following equation with respect to D and y. lambda=(d*(D/y))/m lambda is the wavelength d is the distance between the slits D is the distance from the laser to the board y is the distance from the center maxima to the maxima (m=-4 to 4) and m an interger multiple of the wavelength of light ( we used -4, -3, -2, -1, 1, 2, 3, 4) I got these equations: dlambda/dD= (d/m)*y deltaD and dlambda/dy= (d/m)*D delta y You add these together and plug in variables and error to get experimental error. I understand that d, y and D are the values we used in the experiment. I also understand t…

I am creating an unknown riboflavin solution. I have a mulit-vitamin tablet weighing 0.849g. The bottle says there is 10g of riboflavin in each tablet. The tablet was crushed up and I took 0.201g of the powder and mixed it in 250mL of distilled water. I need to calculate the mass of riboflavin in the entire unknown solution and I am not sure how to set it up. At first I thought you take the 0.849g tablet/10g riboflaven = X/.201g vitamin sample. then X would equal 0.422g riboflavin but where does the 250ml of water in the solution come into play?

Does anyone know the reason that the boiling point of oxygen is lower than that of fluorine ?_?

a. What are the three longest wavelengths for standing waves on a 240cm long stiring that is fixed at both ends? b. if the frequency of the second longest wavelength is 50 hz, what is the frequency of the third longest wavelength? can someone walk me through how to solve this? thanks

Hi: For the reaction: Fructose 1,6-bisphosphate (F-1,6-BP) ↔ DHAP + GAP The standard free energy change, ΔG°', is -23.8 kJ/mol Suppose that in a mammalian liver cell at 37 °C (310 K), the actual metabolite concentrations are as follows: [F-1,6-BP] = 1.4 x 10–5 M [DHAP] = 1.6 x 10–5 M [GAP] = 3 x 10–6 M Calculate the actual free energy change (ΔG) at 37 °C (310K). Question options:-56.2 kJ/mol -23.8 kJ/mol -8.6 kJ/mol -3.2 X 104 kJ/mol I chose -56.2 and repeated all the calculations several times, but it doesnt seem to be the right an…

How is sugar both a kinetic and potential energy?

idk the answer... 3a+5b+6a and 5z+6z2+2z ^ to the power of

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