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.
Where does lightning occur in a cloud? Negative charge accumulates on the bottom of a cumulonimbus cloud and becomes attracted to the positive charge of the ground. When it overcomes air resistance, the charges shâ¦oot down. The lightning that you see is when the positive charge shoots back up into the cloud.