6 DNA questions..Can you answer all? - (May/11/2005 )
Hello.
Here are several questions and matters that generally revolve around the DNA.
I'd be glad to know and understand the answers to these questions as fast as possible:
1)A. You've got a picture of a cell thats' in the divison stage, in which you see 19 doubled chromosmes (bulit from sister chromatids). In what divison stage is this cell found in, and why? (prophase of the mitosis, telophase II of the miosis, prophase of the miosis, anaphase of the mitosis or prophase II of the miosis).
B. If the DNA quantity in the previous section is X, what is the DNA quantity in each of the 5 stages (written in the brackets)?
2)Investigators raised germs in a liquid environment. After few raising circles, they have moved the germs to a raising environment that contains the izotope of heavy Nitrogen -N15, that combines with the nidrogenic bases found in the nucleutids in the cell, making it possible for the germs to have 3 more doubling-cycles.
A How to draw the DNA molecules, heavy and light, in the doubling process of a germ, and include the proption between the heavy-weight molecules in every doubling-cycle.
B A sprouting cell, which is in the end of the G1 stage, was moved to a raising environment containing heavy nitrogen izotope. How to draw the dna molecules, heavy and light, of a pair of homologic chromosomes in the dobling-process?
3) A The insulin hormone in the human being is a small protein, that contains 51 amino acids. WHat's the length of the encoding DNA part for it?
B What's the length of the RNA messanger of the insulin's gene, given that the gene contains 30% Guanine?
C How can germs still produce the insulin protein?
4) The transcriotion is uaually criticized by a protein that connects to a DNA, that's upper relatively to the gene, and not by a change in the RNA's polymrage. Suggest why's that so?
5)In germs there is a buliding track of compound A from materials found in the cell. When you raise germs in a mazeto base, that does not conain compound A, a very big amount of enzymes o the compund A buliding track are created in the cells of the germs. And when you add compund A to the raising-environment, the eznymes amount gets much smaller. Draw a scheme of the apparent structure of the OPERON of compund A and explain it.
And for the last one...
6) A In germs that were raused in a laboratory a mutation was found, that came to expression in producing an INACTIVE PROTEIN. When the amino acids in the mutant protein were compared to those in the active protein, t was found that the amino acid of TYROZINE whichi s in the edge of the amino acids in the active protein, isn't found in the INACTIVE one. What mutation has happened in those germs? Explain it, basing on the genetic code table!
B Here are 2 peptides, translated from the same gene, but from 2 different types of germs - the peptide in breed 1 is alright, while the peptide in the snd is a result of a single mutation. Write the 2 RNA transcriptions of the peptides, and please expalin what kind of mutatuon caused the difference!
The peptides are:
1) aspergin - triptopane - tyrozine - glitzine - arginine.
2) glotmat - levizyne - levizyne - glitzine - atginine. (Might be some errors in the spelling).
*Good luck, and please answer these questions in the next 24 hours! 
*Please send you drawings to harelshol@walla.co.il
*I really need these answers due to Thursday night, so please do your best.
Enjoy and good luck 
Why should we help you with your exam/assignment questions?
This forum is not for cheating at school it is for obtaining consensus opion and help with practical applications of molecular biology.
Also why leave it so late, I'm sure you have had these questions for some time. Why did you not take the time to research the answers yourself rather than cheat by using an internet forum?
This forum is not for cheating at school it is for obtaining consensus opion and help with practical applications of molecular biology.
Also why leave it so late, I'm sure you have had these questions for some time. Why did you not take the time to research the answers yourself rather than cheat by using an internet forum?
Good question, but I believe you didn't define their purpose well.
I disagree with the use of "cheating" and the treatment towards the whole thing. It is indeed an assignmemt I need, but you might as well treat it as any other relevant question. I didn't leave it to so late, and I still have time to complete it.
The assignment I have spns lots of information, and these questions are those I still have to answer, but I find a little trouble with.
I posted this as to get to know these matters better, to use the forum for it's purpose and to get some helpful answers in this subject.
I don't see what's wrong, but do as you will, I'll appreciate any help in these questions.
Anyone? 
I worked hard on the other parts of this assignment, and these are questions that were left.I need your help in these relatively trivial questions, so please do. 
Thanks.
Answers to all these questions can be found in the relevant textbooks - sorry, i like helping but i dont have the time to do someone elses work for them...
Try...
Molecular Biology of The Cell (Alberts et al) its an undergraduate text that should cover most of what your asking + any good genetics textbook - you can tell if its good because it'll be heavy - enjoy 
google searching would also find most of your answers as well.
there are some questions there that require a bit of thought and prior knowledge.
good luck!
You can also check www.askjeeves.com. If u want it 4 free, go 2 a nearest library.
Cheeky Bugger!!! 