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).
The monomers of both DNA and RNA are composed of three parts: a phosphate group, a pentose (5-carbon sugar), and a nitrogenous base. Both DNA and RNA use a form of ribose as their sugar (RNA uses ribose itself; in DNA, a single oxygen atom has been removed from the 2' carbon of ribose, to form deoxyribose).Both DNA and RNA use the bases adenine, cytosine, and guanine.Both DNA and RNA undergo complementary base pairing (DNA usually between two different strands, and RNA usually between two regions of a single strand). Both DNA and RNA are synthesized in the 5' to 3' direction.oth DNA and RNA use the bases adenine, cytosine, and guanine. Both DNA and RNA undergo complementary base pairing (DNA usually between two different strands, and RNA usually between two regions of a single strand).