Report Abuse. I never recommend anyone hitting themselves in the head, but I can explain why they do it. They have a bunch of negative thoughts running through their minds and hitting themselves in the head sometimes interrupts that pattern for a few moments.In fact eft uses light taps on the forehead to break a pattern of negative thinking. The second reason is when people are that angry they cannot think straight.hey have a bunch of negative thoughts running through their minds and hitting themselves in the head sometimes interrupts that pattern for a few moments. In fact eft uses light taps on the forehead to break a pattern of negative thinking. The second reason is when people are that angry they cannot think straight.
Altering nucleotide sequences most often results in nonfunctioning proteins. Mutations cause changes in the genetic code that lead to genetic variation and the potential to develop disease. Gene mutations can be generally categorized into two types: point mutations and base-pair insertions or deletions.Point mutations are the most common type of gene mutation. Also called a base-pair substitution, this type of mutation changes a single nucleotide base pair. Silent Mutation: Although a change in the DNA sequence occurs, this type of mutation does not change the protein that is to be produced. 2  This is because multiple genetic codons can encode for the same amino acid. 3  Amino acids are coded for by three nucleotide sets called codons.
A. Base pair (nucleotide pair) substitutions. These are of two types: transitions (purine to purine or pyrimidine to pyrimidine) and transversions (purine to pyrimidine or pyrimidine to purine). We break these down into the two categories because they can occur in different ways. third type of spontaneous DNA damage that occurs frequently is damage to the bases by free radicals of oxygen. These arise in cells as a result of oxidative metabolism and also are formed by physical agents such as radiation.