Molecular Biology: Definitions and explanations page 1

Learn molecular biology terms with definitions and explanations, molecular biology terminologies (Page 1) for science degree programs.


  1. What is A Site (Ribosomal)?
    The a site in ribosome is the entry point for the 'aminoacyl trna ', (except for ...
  2. What is A Site (RNA Polymerase)?
    A' site in the rna polymerase is an active site of the rna polymerase, where the ...
  3. What is A-DNA?
    A-dna is a form of dna, a biologically active double helical structure, which is assumed in ...
  4. What is A1492 and A1493?
    A1492 and a1493 are two universally conserved bases in 16s rrna that are critical for codon ...
  5. What is AAUAAA?
    Aauaaa is an important hexamer sequence polyadenylation signal in animals, that causes polyadenylation and cleavage about ...
  6. What are Abortive Transcripts?
    Abortive transcripts are short rna transcripts, about 6 nt long, that are produced at prokaryotic promoters. ...
  7. What is Ac?
    Ac is a group of active maize transposing elements, which carry on transposition in a wide ...
  8. What is Accommodation?
    Accommodation is a term that is used to describe the position of aminoacyl-trna, which does not ...
  9. What is Acidic Domain?
    Acidic domain, as the name implies, is an amino acid rich, transcription activating domain in cells. ...
  10. What is Aconitase?
    Aconitase is an enzyme, which, in apoprotein form (iron lacking form) binds to the iron response ...
  11. What is Activation Region I (ARI)?
    Activation region i is the region of cap subunit that binds to the ctd (carboxyl-terminal domain) ...
  12. What is Activation Region II (ArII)?
    Activation region ii is the region of cap subunit, that binds to the ntd( amino terminal ...
  13. What is Activation Site?
    Activation site is the specific site on an aminoacyl-trna synthetase, which activates the amino acid, resulting ...
  14. What is Activator-Binding Site?
    In prokaryotes, activator binding site is that part of the dna to which transcription activator (transcription ...
  15. What is Activator?
    An activator is a protein (transcription factor) that activates transcription by binding to an activator-binding region ...
  16. What is Adenine?
    Dna glycosylases are a group of enzymes that are responsible for base excision repair. adenine dna ...
  17. What is Adenosine Deaminase Acting on RNA (ADAR)?
    Adar gene (adenosine deaminase acting on rna) in humans, encodes the double stranded rna specific enzyme, ...
  18. What is Affinity Chromatography?
    Affinity chromatography is a chromatography method, used to separate biochemical mixture that involves a highly specific ...
  19. What is Affinity Labeling?
    Affinity labeling is a strategy to chemically modify an amino acid residue, within a ligand-binding site ...
  20. What is Ago3?
    Ago3 is an argonaute protein that is predicted to have mrna binding activity. then, in association ...
  21. What is Alarmone?
    Alarmone is a compound that is produced in an organism, in response to harsh environmental factors, ...
  22. What is Alkylation?
    Alkylation is basically the transfer of an alkyl group (carbon containing group) from one molecule to ...
  23. What is Allele-Specific RNAi?
    Rnai (rna interference) or sequence-specific posttranscriptional gene silencing, is induced by small double stranded rnas, called ...
  24. What is Allolactose?
    Allolactose consists of monosaccharides d-glucose and d-galactose linked through a β1-6 glycosidic linkage, to form a ...
  25. What is Allosteric Protein?
    An allosteric protein is one, with multiple ligand binding sites. the binding of a molecule at ...
  26. What is Alternative Splicing?
    Alternative splicing or differential splicing is means splicing of the same pre-rna in more than one ...
  27. What is Alu Element?
    An alu element is a short fragment of the dna (containing the agct sequence), which is ...
  28. What is Amber Codon?
    Amber codon is a stop codon (a codon responsible for the termination of translation). there are ...
  29. What is Amber Suppressor?
    Amber suppressor is a mutant allele, coding for a trna, bearing an anticodon to recognize the ...
  30. What is Amino Acid?
    Amino acids, the building blocks of proteins, are organic compounds, made up of amine and carboxyl ...
  31. What is Amino Tautomer?
    An amino tautomer is the normal tautomer of the nucleotides, cytosine or adenine, found in nucleic ...
  32. What is Amino Terminus?
    Amino terminus or n-terminus is that end of a peptide or a protein primary structure, in ...
  33. What is Aminoacyl-amp?
    Aminoacyl-amp is a complex, comprising of an activated amino acid linked to the phosphate group of ...
  34. What is Aminoacyl-tRNA Synthetase?
    An aminoacyl-trna synthetase is the enzyme that is responsible for attaching a trna to its relevant ...
  35. What is Aminoacyl-tRNA?
    The aminoacyl-trna (also called charged trna or aa-trna) is a transfer rna, which has its cognate ...
  36. What is Amplification?
    Amplification in genetics is the selective replication of a gene, resulting in the production of more ...
  37. What is Anabolic Metabolism?
    Anabolism or anabolic metabolism is the process by which molecules are constructed from simple precursors. they ...
  38. What is Annealing Of DNA?
    Annealing of dna in genetics means the process of reuniting the two strands of a denatured ...
  39. What is Annotated Genes?
    Annotated genes are those genes, or gene like sequences from the coding regions in a genome, ...
  40. What is Anti σ-Factor?
    Anti- σ-factor (anti sigma factor) is an antagonist to the sigma factor that acts by binding ...
  41. What is Anti-Anti σ-Factor?
    Anti-anti- σ-factor is a protein that causes the release of the σ-factor, from the "anti-σ-factor-σ-factor" complex, ...
  42. What is Anti-Anti-Anti σ-Factor?
    Anti-anti-anti- σ-factor is a protein that is associated with the series of sigma factor reactions during ...
  43. What is Antibody?
    An antibody is a large (y shaped) protein, which has the ability to recognize and bind ...
  44. What is Anticodon Loop?
    The anticodon is a three-nucleotide unit, corresponding to the three bases of the mrna codon. this ...
  45. What is Anticodon?
    An anticodon is a sequence of three bases in a transfer rna, that are complementary to ...
  46. What is Antigen?
    Antigen (ag) is a structure or a substance that is recognized and specifically bound by an ...
  47. What is Antiparallel?
    In biochemistry, two biopolymers (like the two strands in a dna double helix) are termed as ...
  48. What is Antirepression?
    Antirepression is the prevention of repression during transcription, by activators such as histones or other transcription-inhibiting ...
  49. What is Antisense RNA?
    Antisense rna (also called antisense transcript, antisense oligonucleotide or natural antisense transcript nat) is a single ...
  50. What is Antiserum?
    An antiserum is a human or nonhuman blood serum containing antibodies (either monoclonal or polyclonal), directed ...
  51. What is Antiterminator?
    Antiterminator proteins are the proteins used by some pages to regulate the gene expression from one ...
  52. What is AP Endonuclease?
    Ap endonuclease stands for apurinic/apyrimidinic endonuclease, an enzyme that functions in the dna base revision repair ...
  53. What is AP Site?
    In molecular genetics and biochemistry, an apurinic or apyrimidinic site (ap site), also called an abasic ...
  54. What is AP-1?
    Ap-1 stands for the activator protein 1, which is a transcription activator that regulates the expression ...
  55. What is APE1 (AP Endonuclease 1)?
    Human apurinic/apyrimidinic endonuclease 1 (ape1) is a mammalian enzyme, that plays a key role in the ...
  56. What is Aporepressor?
    An aporepressor is a repressor, without its compressor, in an inactive form. it combines with a ...
  57. What is Aptamer?
    An aptamer is a nucleic acid, usually an rna, or it can be a region of ...
  58. What is Apurinic Site (AP Site)?
    Apurinic site (ap site) is the location on a dna strand (or in rna sometimes), that ...
  59. What is Apyrimidinic Site (AP Site)?
    Apyrimidinic site (ap site) is a site in the dna molecule which does not have a ...
  60. What is AraC?
    Arac is a dimeric repressor, that is a negative regulator of the ara operon. one monomer ...