5.6. Molecular Biology: DNA and RNA: Genetic Code

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Molecular Biology is an area of ​​science that studies the processes that occur in cells at the molecular level, including the nature and function of genetic material. One of the most important topics in this area is the study of DNA and RNA and the genetic code. This subject is fundamental for understanding how genetic information is transmitted and expressed in cells.

DNA, or Deoxyribonucleic Acid, is a complex molecule that contains all the genetic information necessary for an organism to function. It is composed of two long chains of nucleotides, which are joined by hydrogen bonds to form a double helix structure. Each nucleotide is composed of a nitrogenous base (adenine, thymine, guanine or cytosine), a sugar (deoxyribose) and a phosphate group.

RNA, or Ribonucleic Acid, is similar to DNA but is composed of a single chain of nucleotides. Furthermore, the sugar in RNA is ribose, and the nitrogenous base uracil replaces thymine. RNA plays many roles in the cell, but one of the most important is that of being the molecule that transcribes and translates the information contained in DNA into proteins, which are the molecules that perform most cellular functions.

The genetic code is the set of rules that determine how nucleotide sequences in DNA are converted into amino acid sequences in proteins. Each sequence of three nucleotides, known as a codon, codes for a specific amino acid. For example, the 'AUG' codon encodes the amino acid methionine, while the 'UAA' codon is one of the three stop codons that signal the end of translation.

There are 64 possible codons, but only 20 common amino acids, which means that the genetic code is degenerate - that is, more than one codon can code for the same amino acid. However, the genetic code is almost universal, which means that almost all organisms use the same set of codons to encode the same amino acids.

Understanding DNA, RNA, and the genetic code is fundamental to understanding molecular biology and genetics. These concepts are the basis for understanding how genetic information is stored, transmitted and expressed in cells. In addition, they are essential for understanding many of the modern technologies in genetics and biotechnology, including genetic engineering and gene therapy.

In summary, Molecular Biology is a fascinating area of ​​science that allows us to understand the vital processes that occur at the molecular level. The study of DNA, RNA and the genetic code is a key component of this area, providing the basis for our understanding of how genetic information is stored, transmitted and expressed. This knowledge is fundamental to understanding many aspects of biology, from embryonic development to evolution, and has practical applications in areas such as medicine, agriculture and biotechnology.

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205.7. Molecular Biology: DNA and RNA: Genetic mutation