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The newest bar girl pictures and video from Manila and Bangkok. Can you believe these angel faced filipinas have become cock sucking little devils? The cold water protects the DNA by slowing down enzymes that can break it apart. The cold alcohol helps the DNA precipitate solidify and appear more quickly.

Make sure that you started with enough DNA. Many food sources of DNA, such as grapes, also contain a lot of water. If the blended cell soup is too watery, there won't be enough DNA to see.

To fix this, go back to the first step and add less water. The cell soup should be opaque, meaning that you can't see through it. Cold water helps keep the DNA intact during the extraction process. Cooling slows down enzymatic reactions. This protects DNA from enzymes that can destroy it.

Why would a cell contain enzymes that destroy DNA? These enzymes are present in the cell cytoplasm not the nucleus to destroy the DNA of viruses that may enter our cells and make us sick. A cell's DNA is usually protected from such enzymes called DNases by the nuclear membrane, but adding detergent destroys that membrane. The two most common enzymes used in meat tenderizer are Bromelain and Papain.

These two enzymes are extracted from pineapple and papaya, respectively. They are both proteases, meaning they break apart proteins. Enzymatic cleaning solutions for contact lenses also contain proteases to remove protein build-up. These proteases include Subtilisin A extracted from a bacteria and Pancreatin extracted from the pancreas gland of a hog.

How much pineapple juice or contact lens solution should I use to replace the meat tenderizer? You just need a drop or two, because a little bit of enzyme will go a long way. Enzymes are fast and powerful! DNA precipitates when in the presence of alcohol, which means it doesn't dissolve in alcohol.

This causes the DNA to clump together when there is a lot of it. And, usually, cells contain a lot of it! For example, each cell in the human body contains 46 chromosomes or 46 DNA molecules.

If the human body is made of about trillion cells, each of which contains six feet of DNA, our bodies contain more than a billion miles of DNA! There is a protocol that would allow you to stain nucleic acids, but the chemical used would need to be handled by a teacher or an adult.

So, for now, you'll just have to trust that the molecules precipitating in the alcohol are nucleic acids. The procedure for DNA extraction is really a procedure for nucleic acid extraction. Your DNA may last for years if you store it in alcohol in a tightly-sealed container. If it disappears it's likely because enzymes are still present that are breaking apart the DNA in your sample.

Using more sophisticated chemicals in a lab, it is possible to obtain a sample of DNA that is very pure. DNA purified in this way is actually quite stable and will remain intact for months or years. Cells with more chromosomes contain relatively more DNA, but the difference will not likely be noticeable to the eye. For example, plant seeds yield a lot of DNA because they have very little water in the cell cytoplasm.

That is, they have a small volume. So the DNA is relatively concentrated. You don't have to use very many seeds to get a lot of DNA! Peas are a good source of DNA because they are a seed. But, we also chose the pea for historical reasons.

Gregor Mendel, the father of genetics, did his first experiments with the pea plant. How does the experiment compare when using animal cells instead of plant cells? The DNA molecule is structurally the same in all living things, including plants and animals. That being said, the product obtained from this extraction protocol may look slightly different depending on whether it was extracted from a plant or an animal.

For example, you may have more contaminants proteins, carbohydrates causing the DNA to appear less string-like, or the amount of DNA that precipitates may vary. Good sources for animal cells include chicken liver, calf thymus, meats and eggs from chicken or fish. We at the GSLC have done a fair amount of testing with the split pea protocol and the wheat germ protocol. We have found no difference in the "product" nucleic acids that is observable, whether using meat tenderizer or not.

So, the step was left out of the wheat germ protocol, but kept in the split pea protocol just for fun. Even though it's not necessary, it may be doing something we can't see. For example, perhaps by using the meat tenderizer you get a purer sample of DNA, with less protein contaminating the sample.

The same basic materials are required, but the protocol would need to be scaled down using smaller volumes of water, soap and alcohol. That means that you will not extract an amount of DNA large enough to visualize with the naked eye. If you wanted to see it, you would need a centrifuge to spin down to the bottom of the tube the small amount of DNA present in the sample.

This sample could be used for gel electrophoresis, for example, but all you will see is a smear. Unless you cut the DNA with restriction enzymes, it is too long and stringy to move through the pores of the gel. A scientist with a lab purified sample of genomic DNA might also try to sequence it or use it to perform a PCR reaction. But, your sample is likely not pure enough for these experiments to really work. How is DNA extraction useful to scientists?

When do they use such a protocol, and why is it important? The extraction of DNA from a cell is often a first step for scientists who need to obtain and study a gene. The total cell DNA is used as a pattern to make copies called clones of a particular gene. These copies can then be separated away from the total cell DNA, and used to study the function of that individual gene. Once the gene has been studied, genomic DNA taken from a person might be used to diagnose him or her with a genetic disease.

Alternatively, genomic DNA might be used to mass produce a gene or protein important for treating a disease. This last application requires techniques that are referred to as recombinant DNA technology or genetic engineering.

Unfortunately, a microscope will not allow you to see the double helical structure of the DNA molecule. You'll only see a massive mess of many, many DNA molecules clumped together. In fact, the width of the DNA double helix is approximately one billionth of a meter! This is much too small to see, even with the most powerful microscope. Instead, a technique called X-ray crystallography can be used to produce a picture of the DNA molecule.

But there are lots of other DNA sources too, such as: Put in a blender: Pour your thin pea-cell soup through a strainer into another container like a measuring cup. Add 2 tablespoons liquid detergent about 30ml and swirl to mix.

Let the mixture sit for minutes. Why am I adding detergent? What is that Stringy Stuff? Try these ideas or some of your own: Blending separated the pea cells. To see the DNA, we have to break open these two sacks. We do this with detergent. How does detergent work? Think about why you use soap to wash dishes or your hands.

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