Vectors are the DNA molecules onto to which f.DNA can be cloned. There are two types of vectors1. Cloning Vectors2. Expression VectorsCloning vectors are those to propagate the f.DNA inserts.Expression vectors are those, if the objective is to obtain the gene product (protein) from the inserted f.DNA. For expression vectors suitable regulatory sequence has to be provided, like Promoter, Repressor,Operator, Terminator, etc Promoters are those which marks the starting on the gene which helps the binding of the RNA polymerase and there by the expression of the gene. Promoters are of two types Strong promoter & Weak promoter.Strong Promotes- Which helps in high rate of gene expressionWeak promoter - which low level expression of the gene.The Vectors:Different vectors are availableexamples:pBR322:FeaturesSize : 4.3kbMarkers:ampr, tetrRestriction Sites: BamHI,HindIII, EcoRI,SalI,PstI,etcOri: Present Got something to say about this post? Leave a comment...your comments are valuable for improving the posts.