allele - one of a number of alternative forms of a gene, biodiversity - the range and variety of genes, species and habitats within a particular region, casparian strip - waterproof band in root cells that prevents water passing through, cohesion - attraction between molecules of the same type, conjugation - the transfer of DNA from one bactrerial cell to another, countercurrent system - a mechanism by which the efficiency of excahnge between two substances is increased by flowing in opposite directions, mutation - a sudden change in the amount or the arrangement of genetic material, plasmid - circular bacteria DNA, symplastic pathway - route through the cytoplasm of a cell, apoplastic pathway - route through cell walls and intracellular spaces of plants,

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