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  1. describe the preparation of 500ml of 4.75% w/v aqueous ethanol (mm=46.1 g/mol)
  2. 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. 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. 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. 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. 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. 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. what does - single-locus allele - upstream and downstream DNA primers - dna size marker mean?
  9. what does Diagnostic Digest means?
  10. can u show me please or give me a link that have the structure?
  11. yeah, but what's does it look like and is L-Cysteine a R configuration?
  12. which places were recombinant DNA technology is useful and give reason?
  13. 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. what's the difference between "commercially sterile" and "axenic"?
  15. I tried to do that, but I couldn't find a good answer
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