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AP Bio Chapter 20

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Word
Definition
recombinant DNA   DNA in which genesfrom two different sources are linked  
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genetic engineering   the direct manipulation of genes for practical purposes  
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biotechnology   the manipulation of organisms or their components to perform practical tasks or provide useful products  
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gene cloning   well defined gene-sized pieces of DNA in multiple identical copies  
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restrictive enzymes   protect bacteria from intruding DNA from other organisms, they cut out foreign sequences  
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restriction site   a recognition DNA sequence  
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restriction fragments   the cut pieces of DNA molecules that are reproducible  
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sticky end   double stranded DNA fragments with at least one single stranded end  
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DNA ligase   an enzyme which seals the strands by catalyzing the formation of phosphodiester bonds  
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cloning vector   the original plasmid containing DNA molecules that can carry foreign DNA into a cell and replicate there  
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nucleic acid bybridization   the base pairing between the gene and a complimentary sequence on another nucleid acid molecule  
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nucleic acid probe   the complimentary molecule, a short single stranded nucleic acid that can be either RNA or DNA  
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denaturation   the separation of the two strands  
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expression vector   a cloning vector that contains the requisite prokaryotic promoter just upstream of a restriction site where the eukaryotic gene can be inserted  
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complementary DNA or cDNA   DNA transcripts of RNA which codes for a gene but no introns  
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artificial chromosomes   combine the essentials of a eukaryotic chromosome  
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electroporation   when a brief electrical pulse is applied to a solution containing cells to create temporary holes to allow DNA to enter  
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genomic library   the complete set of thousands of recombinant plasmid clones each carrying copies of a particular segment from the initial genome  
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cDNA library   only part of a cell's genome-only the genew that were transcribed in the starting cells  
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PCR (polymerase chain reaction)   a technique by which any piece of DNA can quickly be amplified without usuing cells  
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gel electrophoresis   separates macro molecules on the basis of size, electrical charge, and other physical properties  
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Southern Blotting   reveals not only whether a particular sequence s present in a sample of DNA but also the restriction fragments that contain the sequence  
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restriction fragment length polymorphisms (RFLPs)   can serve as a genetic marker for a particular locus in the genome, detected by Southern Blotting  
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in situ hybridization   a radioactive probe is allowed to base pair with complimentary sequences in the denatured  
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Human Genome Project   this is an international effort to map the entire human genome, ultimately determining the complete nucleiotide sequences of the DNA of each human chromosome  
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chromosome walking   this is where a probe scans the nucleotides and finds the overlapping ends  
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DNA microarrary assays   the method of detecting and measuring the expressions of thousands of genes at one time  
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in vitro mutagenesis   a technique that can be used to introduce specific changes into the sequenced of a cloned gene  
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genomics   the study of genomes and genes based on DNA sequencing  
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antisense nucleic acid   single stranded molecules of DNA or RNA that have been constructed explicity to base-pair with mRNA molecules and block their translation  
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vaccine   a harmless variant or derivative of a pathogen that stimulates the immune system to fight the pathogen  
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DNA finger print   specific pattern of bands, that is of forensic use  
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simple tandem repeats (STRs)   polymorphic genetic loci  
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transgenic organisms   organisms that contain genes from another species that have been developed for potential agricultural use  
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Ti plasmid (T DNA)   integrates a segment of its DNA into the chromosomal DNA of its host cell plants.  
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