Class A (type D) CpG ODNs (CpG-A ODNs) contain a central palindromic phosphodiester (PO) CpG sequence and a PS-modified 3â poly-G tail. The poly G tails form intermolecular tetrads that result in high molecular weight ordered structures.
Why does a tornado form when cold and hot air meet? The collision of warm and cold air is not the direct cause of a tornado, nor is it absolutely necessary. When a cold air mass pushes into a warm air mass (this is called a câ¦old front) the warmer, less dense air is forced upwards.
Where does the hot and cold air that form a tornado come from? To start off, the warm air cold air are not the direct cause of tornadoes. When cold air plows into warm air, it forces the warm air up causing the moisture in it to condense â¦and form thunderstorms. Given a few other conditions these storms can produce tornadoes.