1.Which of the following statements about iron-sulfur proteins is FALSE? a.They are components of the electron transport chain b.Their iron is not attached to a porphyrin ring c.Their iron is attached to sulfides d.Their iron is attached to the sulfir of sulfur-containing amino acids e.They carry both electrons and protons 2.Which of the following directly ensures that daughter cells contain identical sets of chromosomes? a.Sister chromatids are joined at the centromere b.Sister chromatids move to opposite poles in anaphase c.Nuclear envelopes from in telophase d.Motor proteins pull daughter chromosomes apart e.The energy of ATP is used to separate daughter chromosomes 3.Which of the following statements about promoters is FALSE? a.They are specific nucleotide sequences of DNA b.They consist of three nucleotides that bind to a codon c.They determine the position where RNA synthesis begins d.They determine which DNA strand is used as a template e.They are binding sites for RNA polymerase 4.Which of the following events is NOT part of the initiation stage of translation? a.The smaller ribosomal subunit attaches the mRNA b.GTP is hydrolyzed c.The larger ribosomal subunit attaches to the smaller subunit d.fMet-tRNA binds at the P site e.The initiator tRNA is released from the E site 5.Which of the following statements about cold treatment and flowering is FALSE? a.In winter rye,after cold treatment,plants require long days in order to flower b.In spinach,cold treatment shortens the daylength require for flowering c.In clover,cold treatment completely removes the day length requirement for flowering d.In henbane,gibberellin treatment can substitute for cold treatment in hastening flowering e.In nonrosette long-day plants, gibberellin treatment can substitute for cold treatment in hastening flowing 小弟不材，以上题目不知从何下手，还请各位高手不吝指教，感谢... --

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