简答题________are mutants with no advantage or disadvantage over parental cells when growing under artificial conditions. A、Nonselectable mutants B、High temperature resistance mutants C、Selectable mutants D、Drug resistance mutants简答题Conjugation is mediated by conjugative viruses. A、False B、True简答题The ______ is shown by a capital letter followed by two lowercase letters, with either a plus or minus superscript to indicate the presence or absence of that property. A、genotype B、wildtype C、gene's product D、phenotype简答题The _______ is shown by a capital letter followed by two lowercase letters and then a capital letter. A、gene’s product B、genotype C、phenotype D、wildtype简答题In_______, free DNA released from one cell is taken up by another. A、transduction B、transformation C、conjugation D、both transduction and transformation简答题The _______ is shown by three lowercase letters followed by a capital letter (all in italics). A、wildtype B、genotype C、gene’s product D、phenotype简答题In ________, DNA transfer is mediated by a virus A、both transduction and transformation B、transformation C、conjugation D、transduction简答题Mutation rate in RNA genomes is about ______-fold higher than in DNA genomes. A、1000-10000 B、same C、10-100 D、100-1000简答题In specialized transduction, DNA from any portion of the host genomebecomes a part of the mature virion in place of the virus genome. A、True B、False简答题Hfr cells have _______ plasmid. A、 one free F B、several chromosome-integrated F C、several free F D、one chromosome-integrated F