241 results found

Search Results for: sequence

Signal sequence

Definition noun A sequence of amino acid residues bound at the amino terminus of a nascent protein during protein... Read More

Silent mutation

A mutation is a change in the nucleotide sequence of a gene or a chromosome. When there is only one nucleotide involved, it... Read More

Frameshift mutation

Define Frameshift Mutation What is a frameshift mutation? In biology, insertions or deletions of nucleotides in the coding... Read More

Codon

What does codon mean? A codon, in biology, is the basic genetic unit of life that acts as the template for the amino acid... Read More

Conserved sequence

Conserved sequence (Science: molecular biology) a base sequence in a dna molecule (or an amino acid sequence in a protein)... Read More

Leader sequence

Definition noun (1) 5' UTR (five prime untranslated region); the section of mRNA and DNA beginning at the +1 position up to... Read More

Dna sequence analysis

Dna sequence analysis (Science: molecular biology) determination of the nucleotide Sequence of a length of dna. Typically,... Read More

Genetic Information and Protein Synthesis

Genetic Code Genes are sequences of DNA nucleotides that carry and transmit the information specifying amino acid sequences... Read More

Missense mutation

What is a missense mutation? Literally speaking, a mutation that changes the meaning of the encoded gene sequence is the... Read More

Chromosome Mutations

Reviewed by: Mary Anne Clark, Ph.D. By nature, the genetic information from both parents is expected to be seen... Read More

Carbohydrate sequence

Carbohydrate sequence The sequence of carbohydrates within polysaccharides, glycoproteins, and... Read More

Sequence homology

sequence homology (Science: molecular biology) Strictly, refers to the situation where nucleic acid or protein sequences are... Read More

Consensus sequence

Consensus sequence Of a series of related dna, rna or protein sequences, the sequence that reflects the most common choice... Read More

Amino acid sequence

Amino acid sequence The sequence of amino acids as arrayed in chains, sheets, etc., within the protein molecule. this is... Read More

Signature sequence

signature sequence short oligonucleotides of unique sequence found in 16S ribosomal RNA of a particular group of... Read More

Genetic Mutations

Reviewed by: Mary Anne Clark, Ph.D. Genetic Mutations Genetic mutations are inherited variations in an... Read More

Genome

Genome Definition What is a genome? As defined in biology, a genome is a complete set of deoxyribonucleic acid (DNA) within... Read More

Role of Golgi Apparatus & Endoplasmic Reticulum in Protein Synthesis

Continued from the previous tutorial that introduces protein synthesis... mRNA and tRNA mRNA leaves the nucleus and enters... Read More

Shine-dalgarno sequence

shine-dalgarno sequence A short stretch of nucleotides on a prokaryotic mRNA molecule upstream of the translational start... Read More

Sequence

sequence The noun: the order in which subunits appear in a chain, such as amino acids in a polypeptide or nucleotide bases... Read More

Unique Sequence

A genetic sequence of DNA that is unique, and therefore does not appear anywhere else in the... Read More

Mutagen

Mutagen Definition What is a mutagen? A mutagen is a substance or agent that causes DNA impairment that results in the... Read More

Mutation

A mutation is a permanent, heritable change in the nucleotide sequence or the process by which such a change occurs in a... Read More

Pribnow box

Pribnow box --> promoter (Science: molecular biology) A region of dNA to which rNA polymerase binds before initiating the... Read More

Transcription (biology)

In biology, transcription is the process of transcribing or making a copy of the genetic information stored in a DNA strand... Read More

Protein

Protein Definition Proteins are biomolecules comprised of amino acid residues joined together by peptide bonds.... Read More

Translation

Translation, in general, is the conversion of something into another form, such as a word from one language to another. But... Read More

Nonsense mutation

A nonsense mutation is the type of point mutation that renders the translation process useless by coding for a stop/nonsense... Read More

Allele

Allele Definition What are alleles? An allele is a term coined to describe a specific copy of a gene. Genes, the DNA... Read More

Ribonucleic acid

Ribonucleic Acid Definition noun (uncountable), ribonucleic acids ri·bo·nu·cle·ic ac·id, raɪboʊnjuːkliːɪk... Read More

Phylogenetics

Phylogenetics Definition Phylogenetics is the scientific study of phylogeny. It studies evolutionary relationships among... Read More

Homologous chromosome

A homologous chromosome pertains to one of a pair of chromosomes with the same gene sequence, loci, chromosomal length, and... Read More

Nucleosome

Nucleosome Definition Every organism is made of deoxyribonucleic acid, also known as DNA. DNA is made up of numerous... Read More

Intron

Definition noun, plural: introns (molecular biology) A noncoding, intervening sequence of DNA within a gene that is... Read More

Insertion (genetics)

In genetics, insertion refers to the type of mutation characterized by the insertion of one or few nucleotide base pairs to... Read More

Polymorphism

Polymorphism Definition The occurrence of two or more different forms or morphs in the population of a species is referred... Read More

Complementary DNA

Definition noun A double stranded DNA produced from the messenger RNA synthesis in a reaction catalyzed by an enzymes... Read More

Repeated sequences

Definition noun (molecular biology) Multiple copies of nucleotide sequences in the nucleic acids (i.e. DNA or RNA)... Read More

Gene Regulation in Eukaryotes

Reviewed by: Mary Anne Clark, Ph.D. Eukaryotic Gene Structure In prokaryotes the DNA is located in the... Read More

Recombination DNA repair

Recombination DNA Repair Definition Recombination DNA repair is a biological reparative process in response to DNA damage... Read More