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Repressor: the gene productplugin-autotooltip__default plugin-autotooltip_bigGene product: the molecule that is produced based on information contained within a gene and provides function to the organism. Most of the time, a gene product is a protein. Sometimes gene products can also be an RNA molecule. In forward genetic analysis, we can't formally tell if a gene product is of a geneplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-) that acts in transplugin-autotooltip__default plugin-autotooltip_bigCis and trans: In genetics, cis and trans are terms used to describe the relative physical locations of genes or genetic elements. If two genes are in cis, this means that they are physically located on the same DNA molecule. If two genes are in trans, this means that they are physically located on two different to negatively regulate the expressionplugin-autotooltip__default plugin-autotooltip_bigExpression: a term used to describe the idea that the function of a gene is apparent and can be observed. Genes may not always be expressed all the time in all places. of target genesplugin-autotooltip__default plugin-autotooltip_bigGene: read Chapters 02, 03, 04, 05, and 06 for a definition of gene :-). Repressors are generally DNAplugin-autotooltip__default plugin-autotooltip_bigDNA: deoxyribonucleic acid. The genetic material for nearly all life on Earth. binding proteinsplugin-autotooltip__default plugin-autotooltip_bigProtein: a molecule that is formed by the translation of messenger RNAs (mRNAs). Functions that proteins provide are what usually give organisms their phenotypes. that bind to negatively acting cisplugin-autotooltip__default plugin-autotooltip_bigCis and trans: In genetics, cis and trans are terms used to describe the relative physical locations of genes or genetic elements. If two genes are in cis, this means that they are physically located on the same DNA molecule. If two genes are in trans, this means that they are physically located on two different-acting elements such as operatorsplugin-autotooltip__default plugin-autotooltip_bigOperator: in bacterial genetics, an operator is a cis-acting genetic element that negatively regulates the expression of nearby genes. $lacO$ of the Lac operon is an example of an operator. in bacteriaplugin-autotooltip__default plugin-autotooltip_bigBacteria: Single-celled organisms that also utilize DNA and the standard genetic code as all organisms on earth, but unlike eukaryotes do not have intracellular membranes and membrane-bound organelles. In this book we use bacteria and prokaryote interchangeably..