2.True or False.If true,write"T"on the blank;if false write"F"on the blank.(2 point each,20 points in total) (1)TMicrobes are responsible for the geochemical cycles. (2)TMicrobes have been used to produce food(brewing.wine making.).but they are also responsible for food spoilage (3)FAll the viruses can cause illness and they are all pathogenic. (4)FSynergism is an obligatory interrelationship between two populations that benefits both of them. (5)FAll the genes are always expressed at the same time. (6)TUracil (U)can only be found in RNA (7)TTwo strands of DNA are held together by specific hydrogen bonding between A andT or G and C to form a right-handed helix. (8)TThe genetic codes on tRNA are called anticodons. (9)T Ammonification is the process that the amino groups of amino acids are removed and converted into ammonia (10)TChemolithoautotrophs are organisms that oxidize an inorganic compound for energy and obtain their carbon source from carbon dioxide. 22 2. True or False. If true, write “ T ” on the blank; if false write “ F ” on the blank. （2 point each，20 points in total） (1) ___T__ Microbes are responsible for the geochemical cycles. (2) ___T__ Microbes have been used to produce food(brewing,wine making...), but they are also responsible for food spoilage. (3) ___F____ All the viruses can cause illness and they are all pathogenic. (4) ___F___ Synergism is an obligatory interrelationship between two populations that benefits both of them. (5) ___F____ All the genes are always expressed at the same time. (6) ___T____ Uracil (U) can only be found in RNA. (7) ___T____ Two strands of DNA are held together by specific hydrogen bonding between A and T or G and C to form a right-handed helix. (8) ___T____ The genetic codes on tRNA are called anticodons. (9) ___T____ Ammonification is the process that the amino groups of amino acids are removed and converted into ammonia. (10)___T___ Chemolithoautotrophs are organisms that oxidize an inorganic compound for energy and obtain their carbon source from carbon dioxide