DIY DNA SCIENCE EXPERIMENT! | Breaking Boredom | Simple Science from the Nuclear Museum скачать в хорошем качестве

DIY DNA SCIENCE EXPERIMENT! | Breaking Boredom | Simple Science from the Nuclear Museum

The National Museum of Nuclear Science & History For more fun science visit NuclearMuseum.org Breaking Boredom DIY DNA SCIENCE EXPERIMENT DNA is what makes us who we are. It is so small we cannot even see it without using some help from microscopes or other tools. It is a complex molecule that holds the information that makes us who we are. In this experiment we will show you how to collect so many of the tiny molecules that you will be able to see the cluster. As with any experiment or demonstration make sure to have an adult to help you, they may even have fun! • 16 oz of drinking-water • 1 tablespoon of cooking salt • 1 clear cup or glass, small, with a narrow mouth • 4 oz of chilled rubbing alcohol (Isopropyl alcohol USP 70%) Remember to have an adult help with the Alcohol • food coloring (optional) • 1 eyedropper or 1 spoon • 1 drop of clear dish washing detergent • 1 stir-stick 1: Add the salt to the water and stir until the grains of salt have disappeared. Pour 3 tbsp of the salty water into a cup. 2: Gargle and swish all the salty water from the cup around your mouth. Do not swallow the water. Spit it back into the cup. 3: Dip the stir-stick in the drop of dish washing detergent and gently stir it in the cup. Less froth in the cup is better so only stir it one to two times. 4: Add two or three drops of food coloring to the rubbing alcohol and stir well. The blue food coloring will help you distinguish the alcohol from the water. 5: Use the eyedropper or spoon to very slowly pour the rubbing alcohol down along the inside wall of the cup. Try to add the alcohol very gently, so that the water and the alcohol do not mix. You want the alcohol to form a separate layer on top of the water. It helps to hold the cup at about a 20-degree angle while you do this. Pour enough rubbing alcohol to create a small layer on top of the water. Even if you added the food coloring to the alcohol, the water would remain transparent. 6: Watch the thin strands of DNA collect in the alcohol. When more and more strands of the DNA stick together you eventually have enough to see with the naked eye! Those strands are you! The salt in the water acts like the salt in our bodies and the soap breaks open the cell membranes. Nuclear Museum YouTube Video Presented by Mr Dave & Charlotte