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.
Nucleic acids are made of monomers known as nucleotides. There are 3 parts to nucleotides: one of 4 nitrogenous bases, a sugar, and a phosphate group.RNA as well as DNA are â¦ both nucleotides. The four bases in DNA are: Adenine, Guanine, Cytosine and Thymine (present in DNA only).Plus a slightly different base: Uracil (present in RNA only).ucleic acids are made of monomers known as nucleotides. There are 3 parts to nucleotides. They are a nitrogenous base, a pentose sugar, and a phosphate group. 11 people found this useful.