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HomeHomework HelpbiologyGenetic Code Basics

Genetic Code Basics

The genetic code is a set of rules by which the information encoded in messenger RNA (mRNA) is translated into proteins, consisting of sequences of three nucleotide bases called codons that correspond to specific amino acids. Start codons (such as AUG) signal the beginning of protein synthesis, while stop codons (such as UAA, UAG, and UGA) indicate the termination of translation.

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Biology
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Overview

The genetic code is a fundamental concept in biology that describes how sequences of nucleotides in DNA are translated into proteins. Codons, which are groups of three nucleotides, play a crucial role in this process by determining the specific amino acids that will be assembled into proteins. Start...

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Key Terms

Codon
A sequence of three nucleotides that corresponds to a specific amino acid.

Example: The codon AUG codes for the amino acid Methionine.

Nucleotide
The basic building block of DNA and RNA, consisting of a sugar, phosphate, and a nitrogenous base.

Example: A nucleotide can be adenine (A), thymine (T), cytosine (C), or guanine (G).

Start Codon
A specific codon that signals the start of protein synthesis.

Example: AUG is the start codon that codes for Methionine.

Stop Codon
A codon that signals the termination of protein synthesis.

Example: UAA is one of the stop codons.

mRNA
Messenger RNA that carries genetic information from DNA to the ribosome.

Example: mRNA is transcribed from DNA and translated into proteins.

tRNA
Transfer RNA that brings amino acids to the ribosome during protein synthesis.

Example: tRNA molecules match codons with the correct amino acids.

Related Topics

DNA Replication
The process by which DNA makes a copy of itself before cell division.
intermediate
Protein Folding
The process by which a protein structure assumes its functional shape or conformation.
advanced
Gene Expression
The process by which information from a gene is used to synthesize a functional gene product, usually a protein.
intermediate

Key Concepts

CodonsStart CodonsStop CodonsTranslation