Dna Definition and 374 Threads

i am stuck on this problem and was hoping someone could help.. If a double-stranded DNA molecule is 22% cytosine, what are the percentages of guanine, adenine, and thymine? Thanks

which DNA and RNA bases contain a carbonyl group? Which DNA and RNA bases are primary amines? Thanks for any help

Hello, This morning, I was reading some stuff about DNA Computing on wiki, arstechnica, and other places.. I found it quite interesting and want to know the latest happening in the same area. If any of you is working on this new technology then please let's discuss about it. Thanks

What are DNA polymerase? Why do they have to exist? Why do RNA primers need to be primed? Is the idea of priming, just connecting the 3' to the 5'? What is the difference between the polymerase I, II, III? Homework Equations I have no clue how to answer this and my textbook makes...

Are there any known enzymes that will fix oxidative dna damage without correcting mismatched bases? Any enzymes that are thought to work like that? thanks

How do these enzymes "read" the template strand and "put in" the complementary nucleotide? Also I've heard that DNA polymerase is less error prone than RNA polymerase. How is this accomplished?

Hi there, I tried Google and seems that there's not much information around. I'm thinking what are the use of Buffer ATL, AL, AW1, AW2 and AE, and ethanol added to the sample. Anyone can help? I'd appreciate even if you post me any reference links:approve: Thanks

So not only are researchers spelling out the genetic sequences of extinct creatures, they have now successfully inserted some DNA from an extinct animal into a modern day one and observed how that DNA functions. Amazing! Researchers took tissue from 100yr old museum specimens of a...

Can zinc fingers be used to solve the oxidative DNA damage problem? theoretically? "By attaching zinc fingers which determine where transcription factors bind to endonuclease, which break DNA strands, homologous recombination can be induced to correct & replace defective/undesired DNA sequences"

Sedal is one of the most important shampoo companies in argentina, they recently launched a New Product: Sedal Vegetal DNA. This is what they say it does: http://www.pelo.terra.com.ar/canales/pelo/cabellos_sedal_vegeta/sedalveg_text.htm DNA Considering that the hair is constituted by DNA...

Consider a segment of a molecule of DNA that is a coil with an overall length of 1.6 μm. If the end of the molecule become singly ionized (one end loosing a single electron and the other end gaining a single electron) the helical molecule acts like a spring and compresses 1.10% of its original...

I am trying to complete an assignment about DNA, and the following questions are nowhere to be found in my textbook/notes nor in any easy-to-understand journals! so any help would be greatly appreciated :smile: - The difference between DNA and RNA that allows them to be separated...

Do germ line cells accumulate DNA Damage like the rest of the body? I've heard things about them that make them seem to have very different characteristics to the rest of the body. Ie could germ line cells, or anything, contain your original DNA when you're like 50 or 100, or would the only DNA...

DNA tests can now be done from a cheek swab. But since our mouths are full of bacteria, how is that DNA separated from human DNA?

In a new paper, Smolin sketches a mechanism by which the laws of physics can be selected naturally and thus evolve. He outlines a universal or "meta" law, from which many possible versions of physical law can emerge depending on the start-up----depending on what happens as a new region of...

Hi, To my understanding, the directionality of DNA (3' to 5') (5' to 3') is based on where the free(unattached) end of the ribose is. With this idea, how can bacterial DNA (where the ends are joined together) have directionality?

Synthetic DNA on the Brink of Yielding New Life Forms

Hi. We have done some experiments on stretching of DNA strands. We want to expand our report with some physical modelling but we are having some problems understanding surface tension. We have read some introductive book about fuild dynamics and used wiki a lot but we still have problems...

"Size" of a DNA molecule? Sorry for such a beginner's question in an advanced profile forum: In basic school we were taught that a molecule of a substance is "the smallest structure which still retains all the properties of that substance. If you divide it any further, (at least some of) its...

If you were to select healthy and smart people from our gene pool (in hopes of creating better humans), and let them reproduce in isolation without further intervention, would the generations of offspring down the line still develop the same ailments that the general population develops...

A molecule of DNA (deoxyribonucleic acid) is 2.09 µm long. The ends of the molecule become singly ionized -- negative on one end, positive on the other. The helical molecule acts like a spring and compresses 1.13% upon becoming charged. Determine the effective spring constant of the molecule...

I read that a lot of aging is caused by DNA and mtDNA getting damaged, I was wondering if anyone knew of how much it gets damaged, like say if someone is X years old then the average cell's DNA is Y% correct of what it was originally. Or are changes to DNA much more rare, and if a small change...

hi :smile: i am new over here,needed a little help from u people. i have an assignment to do in which i have to discuss about any 4 examples linking dna mutation to disease

[SOLVED] BiOchem lab DNA electrophoresis 1) what is the the purpose of restriction endonucleases in prokaryotes? how do these organisms protect their DNA against the effects of their own restriction enzyme? 2)why is it important to use purified Dna samplesin restriction digest and gel...

This should be interesting for those in biochemsitry and genetics. Scientists spy enzyme that makes us unique http://www.eurekalert.org/pub_releases/2007-10/uol-sse101707.php http://www.fbs.leeds.ac.uk/research/bulletin/index.php?id=1007

Hi all, I'm interested in learning more about DNA sequence alignment and have been reading up on the topic online. I'm more interested in the Smith-Waterman algorithm for local alignment, but I'm quite confused about how the algorithm works. I know the algorithm works on a MxN matrix...

if anyone can link me to websites explaining history of DNA cloning or showing a time line regarding DNA Cloning discovery i would appreciate it any sources regarding the cloning of DNA would be helpful. thx

Making of dna ? who it,s done

This is what any involved person intuitivelly knew from the beginning of the hype, and now even the scientists figured out: :confused: http://www.boston.com/news/science/articles/2007/06/14/dna_study_challenges_basic_ideas_in_genetics/"

why ? how we can manufacture the DNA?(in laboratory):bugeye:

are we anywhere near understanding DNA well enough to "program" a new species. say, programing a cell to grow into an animal with specific traits. I know similar things are done to a certain extent with genetically modified foods and animals (or on mosquitoes and flies); I know we know enough...

I have a few questions about the dna strand and how long is it. When the dna strand changes through generations is the strand growing longer or is it just changing. Basically does it have a limited amount of data or does it just keep getting more complex.

What would happen if you create an organism with all junk DNA spliced out? While some introns are needed, it appears most DNA does not serve any function. Could a viable yeast or mouse be created with all junk DNA taken out?

Homework Statement By running a DNA blast, we need to identify who is the grandmother, mother, and daughter. And how/why do we know their relationship. The tree is attached. Homework Equations Here are some of the results from blast, I'm not sure if they will help: Group 1...

I've stumbled upon an interesting short article http://www.npr.org/templates/story/story.php?storyId=4225769 It's about the possible danger of Y-chromosome in men loosing its genes throughout the evolution, because it is unpaired (the X-chromosomes are always paired and thus can correct...

Homework Statement I know this is a biology question but this is the most busy forum so I decided to put it here: I'll make this simple. A restriction enzyme reads a DNA strand containing nucleotide base pairs. It cuts the strand after it reads a sequence of 6 base pairs - AAGCCT. Of...

How large is the smallest piece of DNA compared to a hydrogen atom? What chemical elements go into the average strand of DNA? If the human body is mostly H2O, then why are we considered "carbon-based" lifeforms?

Using dendrochronology to get DNA mutation rates? A question: Would it be possible to use DNA analysis in combination with tree ring dating get an accurate DNA mutation rate? By extracting DNA from the inner rings of a tree, shouldn't it be possible to compare it to the DNA from outer...

Net Force in a DNA molecule?? Homework Statement The two strands of the helix-shaped DNA molecule are held together by electrostatic forces as shown in Fig. 16-44. Assume that the net average charge (due to electron sharing) indicated on H and N atoms is 0.2e and on the indicated C and O...

I was wondering what happens to an organ after it's transplanted in another body. Obviously it starts off with the DNA of the donor. However I find it odd that there is something in your body with different DNA then yourself. So I'm wondering if the DNA of the organ eventually changes into...

Since nucleotides are molecules, how does quantum mechanics pertain to DNA and RNA? I have heard there is the study of stability of the DNA and RNA molecules, for instance. What does DNA and RNA actually look like -- as opposed to textbook drawings which illustrate spherical balls attached to a...

Homework Statement The question can be found on this link. It is the last question, the one with the DNA molecules. Prof said that the direction is not important, he is just looking for a magnitude. http://www.phys.uvic.ca/medphys/people/AJ/Courses/Phys216/Assignments/P216-A1-2007.pdf...

I am doing some biology research and need to check if a DNA sequence for complexity and repetitiveness, using Empirical test like Frequency test, Serial test and etc. For that I need to represent or convert the sequence into scalar. My question is basically, how to apply those tests on...

What is the value of prob(conclusion C1 is true IF premise P1 is true)? It depends on the prior probability that the suspect's DNA would be found at the crime scene -- which makes it a true match for some crime scene DNA -- and the true and false positive rates for the police forsensics lab...

...the puppy that never grows old, bug DNA kits for designing your own bugs, Control Genes [found in every dictator], Orangutans who can speak English, Spanish, or Japanese, and ear enlargements for improved hearing are just a few of the wonderful new products available from Michael Crihton's...

Hello, I'm trying to compile a list of factors that could cause a DNA strand to be damaged or modified (denaturalized). I'll list a few that I can think of, if you can add some or nix some of mine, please help me and reply, thanks. 1. Radiation (like gamma rays from the sun) 2...

What would a mole of mammal DNA look like? Smell like? Feel like? How about a mole of plant DNA?

how are DNA and proteins similar in structure? :confused:

How much different are the DNA of chimps and humans. I've read in a magazine that it is 98-99 percent. But, my friend tells me 95%. Who is right? And what is the difference between 98 and 95 percent in terms of the quantity of genetic code?

Does the single-handedness of DNA and RNA indicate that life originated few times, if more than once? What might the sameness between early sequences (in bacteria, say) indicate in this regard?