Alternatives to Adderall? Hello. I've been taking Adderall XR 15mg for the last few months, upped from 5 mg twice a day. It's made an amazing improvement in my work life...focused, less mistakes, on the ball. Here it is...a short time later the effects of it aren't working like they used too. I can hardly focus on this screen as I type currently.
DNA is a complex molecule that is found in all living organisms. Constructing DNA models is a great way to learn about DNA structure, function and replication. DNA contains the genetic information for the reproduction of life. nucleotide is composed of a phosphate, a deoxyribose sugar molecule, and a nitrogen-containing base (A, T, C, or G). The instructions carried on DNA are used to make proteins from amino acids in the cytoplasm.
New DNA molecules are made by copying, using old DNA molecules as a template. Our understanding of this process also goes back to Watson and Crick's observation that only certain base pairings can exist in DNA. Each DNA strand contains the information necessary to reconstruct the other, or complementary, strand. When a cell needs to copy a DNA molecule, it unzips part of the double helix, breaking the rungs of the ladder in half so that the molecule separates down the middle. New nucleotides, floating free in the cell, can then hook up with complementary nucleotides along each strand. Gradually the unzipping proceeds, and the new strands continue to grow until one DNA molecule becomes two identical DNA molecules. A cell copies all of its DNA in this fashion each time it divides.