PSI. Pounds per square inch: a unit for measuring pressure. One PSI equals the pressure resulting from a force of one pound force acting over an area of one square inch. See pound.
  The four bases that make up RNA are:   * Adenine (A)  * Cytosine (C)  * Guanine (G)  * Uracil (U).denine and guanine are complementary, as are thymine and cytosine. RNA is practically the same, â¦ except that thymine is replaced with uracil (U) - meaning that when RNA replicates DNA, any thymine needed is replaced with uracil. Uracil is still compatible with cytosine, though.
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.