A DNA molecule is a twisted ladder-like stack of building blocks called nucleotides. There are four types of DNA nucleotides-adenine, cytosine, guanine, and thymine-or A, C, G, and T, for short.ou've got six billion of these pairs of nucleotides in each of your cells, and amongst these six billion nucleotide pairs are roughly 23,000 genes.
Where does lightning occur?This map from NASA shows color variations indicating the average annual number of lightning flashes per square kilometer. WhereThe new maps show that Florida, for example, is one place where the rate of strikes is unusually high. This is because Florida experiences two sea breezes: one from the east coast and one from the west coast.
It's all about static electricity! Lightning happens when the negative charges (electrons) in the bottom of the cloud (and your finger) are attracted to the positive charges (protons) in the ground (and the pie pan).