# yousuf89

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10

1. ## can anyone help me in this question?

describe the preparation of 500ml of 4.75% w/v aqueous ethanol (mm=46.1 g/mol)
2. ## SDS agarose gel electrophoresis

I know that: bromophenol blue – used as a marker since most proteins and nucleic acid are colorless. glycerol - It is a preservative and a weighing agent. but what's the purpose of SDS and tris base in SDS agarose gel electrophoresis
3. ## I don't understand the question

Are u saying that red blood cell is one of the human cell that do not have entire DNA sequence genome to produce every protein type
4. ## I don't understand the question

which human cells do not have entire DNA sequence genome to produce every protein type? I don't really understand what the question wants , does it mean which cells doesn't have a nucleus or something......
5. ## can anyone help me in this question?

Given the specific rotation of L- Alanine = + 1.8° ( 25° C), calculate the optical rotation (observed) of a 1.10 M solution of Alanine in water at 25° C in a 25cm polarimeter tube. Show all calculations I know the formula is Specific Rotation = observed rotation (deg) × 100 / Optical path length (dm) × concentration (g/100ml) I think I found that the concentration is 0.097999 g/mL and the optical path length is 2.5 dm but I'm little bit confused and I was absent on the class that was talking about this because I had a fever. can anyone help me?
6. ## Need really big help relating to Gravimetric Analysis

It's like the no of atom in a subtance, right? seriously, I'm really don't know how to do it? I really need it for my test revision
7. ## Need really big help relating to Gravimetric Analysis

An experimental alloy contained by copper and tantalum of the alloy was dissolved and analyzed gravimetrically. a) the copper was precipitated and weighed as CuO, a mass of 0.1739g was obtained. Calculate the %w/w Cu in the alloy. b) the tantalum was precipitated and weighed as Ta2O5, a mass 0.4748g was obtained. calculate the %w/w Ta in the alloy.
8. ## definition

what does - single-locus allele - upstream and downstream DNA primers - dna size marker mean?
9. ## Diagnostic Digest

what does Diagnostic Digest means?
10. ## L-Cysteine

can u show me please or give me a link that have the structure?
11. ## L-Cysteine

yeah, but what's does it look like and is L-Cysteine a R configuration?
12. ## recombinant DNA technology

which places were recombinant DNA technology is useful and give reason?
13. ## L-Cysteine

Can any one give me a stereochemical structure of L-Cysteine by using the Fischer convention and indicate whether it is the R or S configuration? Please!! I've searched every website for two days and no detail the L-Cysteine (well the things that I wanted).
14. ## difference between "commercially sterile" and "axenic"?

what's the difference between "commercially sterile" and "axenic"?
15. ## general use of industrial fermentation ethanol

I tried to do that, but I couldn't find a good answer
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