The tangent plane at the point x=a, y=b is the plane that contains all the tangent vectors (at the point) of curves on the surface that pass through the point (a,b,f(a,b)). Another way to define it is to say that this is the plane through the point (a,b,f(a,b)) which is perpendicular to the NORMAL to the surface at that point. The NORMAL to the surface at a point is just defined as the direction perpendicular to all tangent vectors to the surface at that point. Therefore all we need to do to find the equation of the tangent plane is to find a normal to the surface at that point.
Apart from adenine (A), cytosine (C), guanine (G), thymine (T) and uracil (U), DNA and RNA also contain bases that have been modified after the nucleic acid chain has been formed. In DNA, the most common modified base is 5-methylcytosine (m 5 C). In RNA, there are many modified bases, including those contained in the nucleosides pseudouridine (Ï), dihydrouridine (D), inosine (I), and 7-methylguanosine (m 7 G).
DNA stands for deoxyribonucleic acid, while RNA stands for ribonucleic acid. DNA, thus, carries a deoxyribose sugar and RNA contains a ribose sugar. DNA is composed of several types of nitrogenous bases: adenine, thymine, cytosine and guanine.RNA contains nitrogenous bases similar to DNA, but does not contain thymine.It contains uracil instead.NA and RNA are the genetic material that is found in every living cell. These compounds are responsible for cell reproduction and production of proteins necessary for life. While each of these compounds carries information coded by genes, they differ in a number of ways.