What are the main features of the genetic code?

Key Features of the Genetic Code
  • 61 codons code for 20 amino acids.
  • Three codons do not code for any amino acids.
  • Each codon codes for only one amino acid, hence, it is unambiguous and specific.
  • Some amino acids are coded for by more than one codon, hence the genetic code is degenerate.
A.

What is the genetic code made up of?

The genome of an organism is inscribed in DNA, or in some viruses RNA. The portion of the genome that codes for a protein or an RNA is referred to as a gene. Those genes that code for proteins are composed of tri-nucleotide units called codons, each coding for a single amino acid.
  • How does a mutation occur?

    Acquired (or somatic) mutations occur at some time during a person's life and are present only in certain cells, not in every cell in the body. These changes can be caused by environmental factors such as ultraviolet radiation from the sun, or can occur if an error is made as DNA copies itself during cell division.
  • Do all cells of the body express the same genes?

    All the cells in a person's body have the same DNA and the same genes. However, the difference between cells in different tissues and organs is that the "expression" of the genes differs between cells.
  • What is the DNA code for?

    The cell reads the DNA code in groups of three bases. Each triplet of bases, also called a codon, specifies which amino acid? will be added next during protein synthesis. There are 20 different amino acids, which are the building blocks of proteins.
B.

What is the genetic code and how is it determined?

Genetic code, the sequence of nucleotides in deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) that determines the amino acid sequence of proteins. Though the linear sequence of nucleotides in DNA contains the information for protein sequences, proteins are not made directly from DNA.
  • What is mutation explain?

    Mutations. Definition. A Mutation occurs when a DNA gene is damaged or changed in such a way as to alter the genetic message carried by that gene. A Mutagen is an agent of substance that can bring about a permanent alteration to the physical composition of a DNA gene such that the genetic message is changed.
  • Why is the genetic code so important?

    Although each codon is specific for only one amino acid (or one stop signal), the genetic code is described as degenerate, or redundant, because a single amino acid may be coded for by more than one codon. Furthermore, the genetic code is nearly universal, with only rare variations reported.
  • What is a codon and what do they code for?

    genetic code. …a unit known as the codon, which codes for an amino acid. For example, the sequence AUG is a codon that specifies the amino acid methionine. There are 64 possible codons, three of which do not code for amino acids but indicate the end of a protein.
C.

What is the meaning of genetic code?

The genetic code is the set of rules used by living cells to translate information encoded within genetic material (DNA or mRNA sequences) into proteins. The code defines how sequences of nucleotide triplets, called codons, specify which amino acid will be added next during protein synthesis.
  • What is a codon and what do they code for?

    genetic code. …a unit known as the codon, which codes for an amino acid. For example, the sequence AUG is a codon that specifies the amino acid methionine. There are 64 possible codons, three of which do not code for amino acids but indicate the end of a protein.
  • How many codons are in the genetic code?

    The Genetic Code. The genetic code consists of 64 triplets of nucleotides. These triplets are called codons.With three exceptions, each codon encodes for one of the 20 amino acids used in the synthesis of proteins. That produces some redundancy in the code: most of the amino acids being encoded by more than one codon.
  • What are genes and what do they do?

    Genes tell your body how to make all its proteins. Each new cell in the growing embryo receives a full set of genes. But not every cell needs to make every protein and cells make some proteins only at certain times. Some genes are instructions for proteins that regulate the activity of other genes.

Updated: 20th September 2018

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