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Adenovirus:
a group of DNA-containing viruses that cause respiratory disease,including one form of the common cold. Adenoviruses can also be genetically modified and used in gene therapy to treat cystic fibrosis, cancer, and potentially other diseases.
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Allele:
One of two or more alternative forms of a gene located at the corresponding site (locus) on homologous chromosomes. Different alleles produce variation in inherited characteristics such as hair color or blood type. In an individual, one form of the allele (the dominant one) may be expressed more than another form (the recessive one).
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Anneal:
Similar to hybridize, to bring complementary strands of nucleic acids together
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antibiotic selection:
A method used to ascertain whether a particular plasmid has been successfully integrated into the DNA sequence of a bacterial cell
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Antiparallel
Arranged in an opposite but parallel manner
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Antisense RNA
RNA, with sequence complementary to a specific RNA transcript or mRNA, the binding of which prevents processing of the transcript of translation of the mRNA
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Bioinformatics
The science of managing and analyzing biological data using advanced computing techniques. Especially important in analyzing genomic research data.
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Bioremediation
The use of biological organisms such as plants or microbes to aid in removing hazardous substances from an area
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Camptothecin
A chemotherapeutic agent that can inhibit protein synthesis by inhibiting the action of topoisomerase
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Carcinogen
A substance capable of causing cancer in living tissues
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Character
A feature that is transmissible from parent to offspring
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Cromatin
- The self-replicating genetic structure of cells containing the cellular DNA that bears in its nucleotide sequence the linear array of genes.
- Prokryotes: chromosomal DNA is circular, and entire genome is carried o one chromosome.
- Eukaryotic Genomes consist of a number of chromosomes whose DNA is associated with different kinds of proteins
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Clone
To create an exact copy made of biological material such as a DNA segment, a whole cell, or a complete organism
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Cloning vector
DNA molecule originating from a virus, a plasmid, or the cell of a higher organism into which another DNA fragment of appropriate size can be integrated without loss of the vector's capacity for self-replication; vectors introduce foreign DNA into host cells, where the DNA can be reproduced in large quantities.
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Codon
Sequence of three nucleotides in DNA or mRNA that specifies a particular amino acid during protein synthesis; also called triplet. 64 possible codons, 3 of which are stops, which do not specify amino acids
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Complementary DNA (cDNA)
DNa that is synthesized in the laboratory from a messenger RNA (mRNA) template
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Daughter cells
Two cells resulting from division of a single parental cell
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Denaturation
Alternation in the conformation of a protein or nucleic acid caused by disruption of various non-covalent bonds caused by heating or exposure to certain chemicals; usually results in loss of biological function
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Deoxyribonucleic acid (DNA)
Long linear polymer, composed of four kinds of deoxyribose nucleotides, that is the carrier of genetic information. In its native state, DNA is a double helix of two antiparallel strands held together by hydrogen bonds between complementary purine and pyrimidine bases.
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Diploid
A full set of genetic material consisting of paired chromosomes, one form each parental set. Most animal cells except the gametes have a diploid set of chromosomes. Human genome has 46 chromosomes.
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DNA binding proteins
Protein molecules that help to stabilize the single-stranded DNA during DNA replication
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DNA ligase
an enzyme that links together the 3' end of one DNA strand with the 5' end of another forming a continuous strand
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Dominant
An allele that is almost always expressed, even if only one copy is present
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Encode
In general use, to put into code; in genetics, to specify the genetic code for
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Exon
The protein-coding DNA sequence of a gene
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Expression vector
A modified plasmid or virus that carries a gene or cDNA into a suitable host cell and there directs synthesis of the encoded protein. Some expression vectors are designed for screening DNA libraries for a gene of interest others, for producing large amounts of a protein from its cloned gene.
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Gamete
Mature male or female reproductive cell with a haploid set of chromosomes (23)
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Gene
The fundamental physical and functional unit of heredity. A gene is an ordered sequence of nucleotides located in a particular position on a particular chromosome that encodes a specific functional product
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Genetic code
The nucleotide triplets of DNA and RNA molecules, which carry genetic information in living tissue
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Genetic expression
The entire sequence that occurs in converting a DNA sequence into a protein
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Genetically modified organsim
Plant or animal that has been modified using recombinant DNA technology
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Genetics
The study of inheritance patterns of specific traits
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Genome
A complete set of genes or genetic material present in an organism's chromosomes
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Genotype
Entire genetic constitution of an individual cell or organsim
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Germ cells
- Sperm and egg cells and their precursors.
- Haploid-- only one set of chromosomes (23)
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Glycosylation
The addition of carbohydrates to proteins
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Haploid
A single set of chromosome present in the egg and sperm cells of animals. (23 chromosomes)
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Helicase
An enzyme that moves along a DNA duplex using the energy released by ATP hydrolysis to separate (unwind)the two strands; required for the replication and transcription of DNA
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Heredity
The genetic transmission of characteristics from parent to offspring
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Heterozygous
Referring to a diploid cell or organism having two different alleles or a particular gene
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Histone
A group of proteins packaged with DNA to form chromatin that plays a role in gene regulation
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Homologous
Corresponding or similar in structure (or function)
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Incomplete Dominance
A phemomenon whereby the presence of multiple alleles in a heterozygote leads to a trait that appears intermediate to the homozygous phenotypes
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Intron
DNA sequence that interrupts the protein-coding sequence of a gene; an intron is transcribed into RNA but is cut out of the message before it is translated into protein
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Karyotype
A photomicrograph of an individuals chromosomes arranged in a standard format showing the number, size, and shape of each chromosome type
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Knockout
Inactivation of specific genes.
Often created in labs so they can study the knockout organism as a model for a particular disease
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Lagging strand
The DNA template of a double stranded DNA molecule opposite the leading strand that codes in the direction 5' to 3'
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Leading strand
The DNA template of a double-stranded DNA molecule opposite the lagging strand that codes in the direction 3' to 5'
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Liposome
Spherical phospholipid bilayer structure with an aqueous interior that forms in vitro from phospholipids and may contain protein
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Locus
The specific site of a gene on a chromosome. All the alleles of a particular gene occupy the same locus
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Meiosis
The process of two consecutive cell divisions in the diploid progenitors of sex cells. Meiosis results in four rather than two daughter cells, each with a haploid set of chromosomes
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Messenger RNA (mRNA)
RNA that serves as a template for protein synthesis
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Mitosis
The process of nuclear division in cells that produces daughter cells that are genetically identical to each other and to the parent cell
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Mutagenesis
Development of a mutation (change in DNA base)
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Mutant
Individual, organism, or new genetic character arising or resulting from mutation
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Mutation
Alteration or change in DNA base(s)
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N-myristoylation
The addition of fatty acids to proteins
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Nucleic acid hybridization
The process of joining two complementary strands of DNA or one each of DNA and RNA to from a double-stranded molecule
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Nulliploid
Devoid of a nucleus or nuclei
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Okazaki fragments
Short DNA fragments that are joined to form the lagging strand of DNA
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Oligonucleotide
A molecule usually composed of 25 or fewer nucleotides; used as a DNA synthesis primer
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Phenotype
The physical characteristics of an organism or the presence of a disease that may or may not be genetic
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Phosphodiester bond
A bond between the 5'-phosphate of one nucleotide and the 3'-hydroxyl of another
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Plasmid
- Autonomoulsy replication extrachromosomal circular DNA molecule, distinct from the normal bacterial genome and nonessential for cell survival under nonselective conditions.
- Some can integrate into the host genome
- Artificially constructed plasmids are used as Cloning vectors
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Pleitropy
One gene that causes many different physical traits such as multiple disease symptoms
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Polygenic
Determined by more than one gene
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Polymerase chain reaction (PCR)
A method for amplifying a region of DNA by repeated cycles of DNA synthesis in virto
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Polyploid
Having multiple chromosome sets as a result of a genetic event that is abnormal, or programmed
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Post-transnational modification
Chemical change in the polypeptide chain after translation
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Prenylation
The addition of lipids to proteins
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Primer
Short preexisting polynucleotide chain to which new deoxyribonucleotides can be added by DNA polymerase
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Promoter
A DNA site to which RNA polymerase will bind and initiate transcriptoin
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Proteolysis
The directed degradation of proteins or peptides by the actions of enzymes
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Recessive gene
A gene that will be expressed only if there are two identical copies or, for a male, if one copy is present on the X chromosome
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Recombinant DNA technology
- Joins together DNA segments in a cell-free system.
- recombinant DNA can enter a cell and replicate there, either autonomously or after is has become integrated into a cellular chromosome
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Renaturation
The process by which proteins or complementary strands of nucleic acids re-form their native conformations
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Replication fork
A structure that forms when two parental DNA strands separate
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Replication origin
A site for the initiation of DNA replication
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Restriction endonuclease
An enzyme that cleaves DNA at a specific sequence
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Retrovirus
- A type of virus that contains RNA as its genetic material.
- RNA translates into DNA and inserts itself into an infected cells DNA.
- Causes many diseases, including cancers and AIDS
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Reverse transcriptase
An enzyme used by retroviruses to form a complementary DNA (cDNA) sequence from their RNA. The resulting DNA is then inserted into the chromosome of the host cell
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Ribonucleic acid (RNA)
RNA delivers DNA's genetic message to the cytoplasm of a cell where proteins are made
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Ribosome
A small molecule containing RNA and associated proteins, present within the cytoplasm of living cells, that is involved in protein synthesis by binding to mRNA and tRNA
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Robosomal RNA
- A multicompnent system of RNA synthesized in the nucleolus of cells.
- Constitutes the central component of ribosomes
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RNA interference (RNAi)
Short RNA sequences that are complementary to mRNA sequences and may interfere with translation
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RNA polymerase
An enzyme that catalyzes the synthesis of RNA
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RNA Primase
An enzyme that catalyzes the synthesis for RNA
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Semiconservative
Describes a from of replication whereby the newly formed DNA in the daughter cell is made up of an original parental strand and one newly synthesized
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Single nucleotide polymorphism (SNP)
DNA sequence variations that occur when a single nucleotide (A, T, C or G) in the genome sequence is altered
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Small interfering RNA (siRNA)
A class of 20-to 25-nucleotide-long RNA molecules that play a number of roles in biology including RNA interference
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Somatic cell
any cell in the body except gametes and their precursors
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Southern blotting
Transfer by absorption of DNA fragments separated in electrophoretic gels to membrane filter for detection of specific base sequences by radiolabeled complementary probes
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Splice
The process of removing introns in an RNA transcript
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Structural gene
any gene that codes for the amino acid sequences in a protein except the regulatory protein
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Systems bioloby
The study of interactions between the components of a biological system and how these interactions give rise to the function and behavior of that system
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Termination codon
Any of three mRNa sequences (UGA, UAG, UAA) that do not code for an amino acid and therefore signal the ed of protein synthesis
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Toposiomerase
An enzyme that catalyzes the reversible breakage and rejoining of DNA strands
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Trait
A variation of a charachter
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Transcription
The synthesis of an RNA copy from a sequence of DNA; 1st step in gene expression
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Transcription factor
A protein that binds to regulatory regions and helps control gene expression
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Transduction
The introduction of genetic materials into cells using viral methods
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Transfection
The introduction of genetic material into eukaryotic cells
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Transfer RNA (tRNA)
- A class of RNA having structure with triplet nucleotide sequences that are complementary to the triplet nucleotide coding sequences of mRNA.
- Bonds with a.a. and transfer them to the ribosomes, where proteins are assembled according to the genetic code carried by mRNA
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Transform
(bacteria) the genetic alteration of a cell caused by the uptake and expression of foreign DNA
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Transgenic
Being an organism the genome of which has been altered by the transfer of a gene or genes from another species or breed
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Translation
The process in which the genetic code by mRNA directs the synthesis of proteins form amino acids
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