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Messenger RNA (mRNA) is synthesized from a gene segment of DNA which ultimately contains the information on the primary sequence of amino acids in a protein to be synthesized. The genetic code as translated is for m-RNA not DNA. The messenger RNA carries the code into the cytoplasm where protein synthesis occurs.

Genetic Code:

Each gene (or distinct segment) on DNA contains instructions for making one specific protein with order of amino acids coded by the precise sequence of heterocyclic amines on the nucleotides. Since proteins have a variety of functions including those of enzymes mistakes in the primary sequence of amino acids in proteins may have lethal effects.

How can a polymeric nucleotide with only four different heterocyclic amines specify the sequence of 20 or more different amino acids? If each nucleotide coded for a single amino acid, then obviously only 4 of the 20 amino acids could be accommodated. If the nucleotides were used in groups of two, there are 16 different combinations possible which is still inadequate.

It has been determined that the genetic code is actually based upon triplets of nucleotides which provide 64 different codes using the 4 nucleotides. During the 1960's, a tremendous effort was devoted to proving that the code was read as triplets, and also to solving the genetic code. The genetic code was originally translated for the bacteria E. Coli, but its universality has since been established. The genetic code is "read" from a type of RNA called messenger RNA (mRNA). Each nucleotide triplet, called a codon, can be "read" and translated into an amino acid to be incorporated into a protein being synthesized. The genetic code is shown in Figure 7.

Several distinctive features of the genetic code are clearly evident. First, all of the 64 codons or triplets have a known function, with 61 coding for amino acids and the other 3 serving as a stop or termination signal for protein synthesis. Secondly, the code is degenerate, meaning that there are usually several codons for each amino acid. Only methionine and tryptophan have a single codon. More specifics on the importance of the degeneracy of the genetic code will be discussed in a later section.

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βˆ™ 13y ago
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βˆ™ 5mo ago

The basic unit of messenger RNA (mRNA) is a nucleotide, which consists of a phosphate group, a ribose sugar, and one of four nitrogenous bases (adenine, cytosine, guanine, or uracil). mRNA is transcribed from DNA and carries the genetic information from the nucleus to the ribosome, where it is translated into a protein.

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βˆ™ 10y ago

The basic unit of messenger RNA is nucleotides. Nucleotides are also the basic units of DNA and are organic molecules.

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Q: Basic unit of messenger RNA
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Related questions

The basic unit of messenger RNA?

Amino acids are the basic units of messenger RNA. mRNA is synthesized from DNA and is a single stranded molecule.


What are nucleotides the basic unit of?

DNA and RNA


RNA that is a copy of DNA message that can enter the cytoplasm?

Messenger RNA (mRNA) is a copy of the DNA message that is transcribed in the nucleus and can be translated into proteins in the cytoplasm. It carries the genetic information from the DNA to the ribosomes where protein synthesis occurs.


What Nucleotides are the basic unit of macromolecules?

DNA and RNA


What are the 3 different?

transfer RNA messenger RNA Ribosomal RNA


What is the form of RNA that carries the code from the DNA to the site where the proteins is assembled?

mRNA (messenger RNA) is the form of RNA that carries the genetic code from DNA in the cell nucleus to the ribosomes in the cytoplasm, where proteins are synthesized. This process is known as transcription.


What is The type of RNA that carries information from DNA to the ribosome of a cell is known as?

The type of RNA that brings instructions from DNA in the nucleus to the cytoplasm is messenger RNA or mRNA.


What are the shapes of RNA?

mRNA - messenger RNA tRNA - transfer RNA rRNA - ribosomal RNA


What are 3 types of RNA requireed for protein?

Messenger RNA Transcription RNA Ribosomal RNA


Which type of RNA brings the information in the genetic code from the nucleus to other parts of the cell?

Messenger RNA (mRNA) is the type of RNA that carries the genetic information from the DNA in the nucleus to the ribosomes in the cytoplasm, where proteins are synthesized.


What RNA strand is produced from DNA?

messenger RNA (mRNA)


What type of rna takes a message out to the cytoplasm?

messenger rna