Dna Definition and 386 Threads

Hi I am not from biological background and I seek simple explanations for the above (genes, chromosome and DNA) I know plenty of material are available in net, but if some one explains me what they are and how they are connected in essence I would be grateful to him. These terms are repeatedly...

The purpose of meiosis is to create genetic variation unattainable through mitosis by, in effect, randomly replacing one homolog from each homologous chromosome pair with another one from a different individual. There is also an exchange of genes between homologs before this replacement occurs...

1. A. E.coli DNA ligase can act as a DNA gyrase in the presence of high concentrations of AMP. Explain. B. Would you expect the E.coli ligase/AMP combination to resemble type I or II topoisomerase, or neither. Justify. C. Would you expect human DNA ligase to act as a topoisomerase in the...

Can DNA adopt an A-form helix, and can RNA adopt a B-form helix. If so, under what conditions, and if not, why not? The only idea I have so far is that low humidity will help form the A form, and high humidity forms the B form. However, can humidity change in our bodies? I'm lost here.

This was a quiz question recently in my microbiology class: In what way are transcription and DNA replication compartmentalized in eukaryotes? a. they occur in the same compartment b. they occur in separate compartments c. one must be finsished before the others start d. they are...

Greetings all, I have a problem where I am asked to estimate the number of DNA polymerase in a eukaryotic cell. The sub-question prior to this asked me to find what fraction of the total DNA of a fly was shown in a micrograph in my book. How do I go about estimating this? Is it 2 for each...

How much of "junk dna" is actually on/off switches for gene regulation?

is it possible to interfere in our dna and make the cells reproduce very fast for exp: 10 times in a single second and manipulate the dna in that way so they can't stop renewing or reproducing

"DNA waves and water" Hello all, I've tried to keep in touch with the physics world in my life beyond academics and I came across this paper: http://arxiv.org/PS_cache/arxiv/pdf/1012/1012.5166v1.pdf On one hand I think "this guy is a Nobel prize winner" and on the other hand I am...

Ok I can see the 5 end is negative, is the 3 end positive due to OH. So in other strand this goes other way round. Is this what they mean when they say there is reverse polarity in a DNA molecule. Thanks!

Hello everyone, I'm not very good at this area, so I tried to do some questions to get better, but I have many confusions as a result. This is not homework, I hope you can help me. Thank you :smile: These are true, false questions. *Restriction fragment length polymorphism can be used...

As the title says. I found some contradictory articles about us (not) having the same dna as prehistoric men 50.000 years ago. So how did our dna evolve in the last tens of thousands of years especially human dna of today compared to human dna at the end of pleistocene and can i find some...

Hello! From a data set of F-x measurements of a single dsDNA molecule I want to calculate the persistence length P . So I plotted \frac {1} {\sqrt{(F)}} vs. x and fitted these data points (linear). According to an interpolation formula the extension x of a worm like chain with contour...

1. Suppose DNA molecules of a Streptococcus bacterium contain a radioactive isotope N^{15}, if this bacterium is then put in an environment containing only N^{14} and after 5 generations (DNA duplication), how many N^{15} DNA molecules remain ? Homework Equations 3. after 5...

When I see something like "Humans and Bananas share 50% the same DNA with one another!", I have several questions. First of all, a banana has 530 million base pairs whereas a human has approximately 3 billion. Even if we took the first 530 billion base pairs of the human genome, this would only...

I want to know what material is needed if I want to extract the DNA of a plant and show it in a computer.

I was looking at this page and in the diagram (3rd image down) it shows 23 pairs of chromosomes. http://www2.le.ac.uk/departments/genetics/vgec/highereducation/topics/dnageneschromosomes Do they all fit together to make one strand or is there 23 separate pairs of chromosomes in the nucleus...

I recently read this article that one guy here on the forum wrote few years ago: "Evolution knows nothing. It has no direction or knowledge about anything. Natural Selection drives which random mutations in the genetics of a population are left to be passed on to the next generation. If a...

The following comes from a rudimentary understanding of DNA and biology. Correct me if I have wrong assumptions. Each cell of an organism contains the same set of DNA as all the other cells of the body. Exceptions occur from imperfect copying but these are pathological. Since not all...

DNA Is a Structure That Encodes Biological Information. As you know recently DNA is used to encode digital information. (i.e. translate binary (0,1) to DNA(A,T,C,G)). This is very new knowledge. Is there any good reference or tutorial book that trains how to encode information to DNA and...

Published today in Nature, researchers report engineering an organism capable of replicating DNA with an unnatural base pair (X-Y) in addition to the two normal base pairs found in DNA (A-T and C-G). Here's what the unnatural base pair looks like (in comparison to the C-G base pair)...

And this is why I'm going to hazard to guess that the next century of biology will be heavily dominated by the study of post translational modifications. The genome only encodes ~26,000 genes, and the entire end product of the genome+epigenetics--the proteome--only is comprised of roughly...

Is it theoretically possible that two people not directly related could be born with identical DNA? I would imagine that there is always the chance of a series of mutations that make one person identical to another, but I have no sense of the magnitude of the odds of such an event - I assume...

Hello All! I have a Bio Test on DNA Replication tomorrow and I had a quick question. (I'm in 8th grade) When the textbook states that DNA can only be replicated from the 5' to 3' direction, I don't get it. If it's like this PT. B -> 5' ---------- 3' 3' ---------- 5' <-...

As known the DNA molecule has got negative electric charge. Imagine that linear (almost like a straight arrow) DNA is placed in water solution and we turn the electric field on. I would like to know if the DNA molecules can orientate/rotate so that they to stay along the field lines of the...

This is my first time isolating the whole genomic DNA from cells. I have two cell line HeLa and Human fibroblasts (almost fully confluent T-25 flasks). The problem is that the protocol which is to be followed for genomic dna extraction is only suitable for DNA solutions less than or equal to...

How would I store human DNA for decades, at room temperature, blood samples and not too invasive methods available. It needs to be 100% undamaged and usable for genome mapping.

Scientists discover double meaning in genetic code http://www.washington.edu/news/2013/12/12/scientists-discover-double-meaning-in-genetic-code/

http://www.nature.com/nature/journal/vaop/ncurrent/full/nature12788.html After performing a successful analysis of 400,000 year old of human mitochondrial DNA from a femur from an individual from Spain, the results are generating more questions than answers. The previous take on human...

There are only a finite number of combinations of DNA that one can have while still being human so my question is what are the chances of two people having the same DNA?

How does circular DNA wrap around a histone to form a chromosome? Or does it? I am having a hard time visualizing this for any sort of circular DNA: prokaryotes, mitochondria, etc. (This question was inspired by my reading about biology and reading that circular DNA does, in fact, form...

Hey, I just came across this idea that sounds really cool in theory, but I'm wondering if anyone out knows if it's actually technically possible: Lab-on-a-chip detectors http://marblar.com/challenge/Micro-mixer/idea/1237 So the analyte is passively mixed by a tiny microfluidic mixer which...

Hello. Regards to all. I am working on an Organism Simulation Framework to simulate virtual organisms on low cost computers. I have already developed an alpha version of the project. To see the project, visit: www.sourceforge.net/projects/livmach Now I am in the phase where I require...

I'm working on a project in the field of DNA origami and need links to research papers and study content for the trapping processes and folding processes. Can anyone help?

given humans have 64 possible codons, I am imagining a crowd of tRNA, each carrying an amino acid, swarming clumsily with random thermal motion around a ribosome with a feed of mRNA. How do the tRNA anti-codons find the right mRNA codons so quickly?! I saw a video that shows the amino acids...

I was watching the National Geographic Genographic Project where they are collecting DNA from people worldwide and tracing their ancestor's migrations around the world. You can be a part of the project by purchasing the Geno 2.0 Genographic Project Participation Kit. I think this would be...

Hi this is my first post so i hope its ok :). I was wondering what are others opinions on this ? ? THIS IS THE LINK LOOK AT THIS WONDERFUL LINK Have you ever wanted to be a human usb ? ? Personally i don't see where this could go if they were able to start storing large...

I have a basic question about DNA replication. As I understand, the double helix DNA replicates, and two double helix DNA strands are created. I understand that part. Now the question is, are these two DNA strands completely separated and floating about in the nucleus? If so, the next...

Here is the full article, just published today: http://phys.org/news/2013-01-quadruple-helix-dna-human-cells.html The article makes it apparent that this discovery could be used to inhibit the reproduction of cancer cells. Does anyone know of any other uses that this discovery could lead to?

Link: http://research.microsoft.com/en-us/projects/dna/ As I was experimenting around with that simulator, and realized that the language have some similarities with the assembly language, I asked myself: "Are programming languages such as C++ (or at least some of its concepts) will still...

The Daily Mail Even as a novice in biology, I found this amazing and had to post it here.

Homework Statement You have a dye, Sybr GreenI which binds only to double stranded DNA (not single stranded). Once bound, it fluoresces strongly and can be used to monitor DNA melting (transition from double stranded to single stranded). (i) on the axes provided draw the DNA melt curve...

Here you go. I’m interested in what the experts say about this. On another forum, my attention was drawn to this article: http://news.yahoo.com/blogs/technology-blog/study-female-brains-commonly-flooded-male-dna-225612162.html Male DNA? Female DNA? There’s no such thing, surely. Only human...

I belong to ECE department. I know some basics of DNA structure and DNA based sensors. With a DNA in hand can we predict the genetic disorders of a person? If yes how? which part of DNA possesses the characteristics of genetic disorders ? Also by taking the DNA of a women and hybridizing it with...

Homework Statement A DNA 5-[32P] CCT TCG T TCG TTG TTC CCT A GGC TGT ATA GCC CCT ACC TTT TTG GTA GGG GCT ATA CAG CC was elongated by DNA polymerase in four reaction mixtures in the presence of dATP, dTTP, dGTP (dCTP was omitted due to an experimental mistake) and one ddNTPs. The four reaction...

How do DNA, RNA and Proteins bind together? I mean Dna and rna differ in uracil and thymine bases along with the sugars but both differ from proteins in the fact that proteins are made up of amino acids whereas dna and rna are made up of nucleotides. So how do they bind to each other?

John has been accused of murder and the police have found DNA evidence at the scene. The probability of a DNA match given that a person is innocent is 1/100,000. The probability of a DNA match given that a person is guilty is 1. John lives in a city where there are 100,000 people who could have...

What are some good documentaries on cell theory cell membranes DNA or genetics.Also documentaries on bacteria and viruses would be good.

In semi-conservative DNA replication why does it happen that one of the new strands formed is discontinuous while other is continuous?

My apologies to (Ryan_m_b) for my previous post not being detailed enough to support a true discussion. This is the oddest results I have ever seen..and need opinions.. Below is a DNA result that the Alleged Father has been passed off as the father of both children.??. By reviewing...