有下列情形之一的,为较大事故:( )。
A. 造成3人以上10人以下死亡
B. 造成10人以上50人以下重伤
C. 中断繁忙干线铁路行车6小时以上24小时以下
D. 中断其他线路铁路行车10小时以上48小时以下
Which type of mutation does not belong to substitutions?
A. silent mutations,
B. insertion mutation.
C. missense mutation,
D. nonsense mutation
Which type of mutation in the genes would not result in any change in the amino acid sequence of that gene?
A. silent mutations,
B. insertion mutation.
C. Missense mutation,
D. nonsense mutation
Which type of mutation in the genes would only change a codon for one amino acid into a codon for a different amino acid?
A. silent mutations,
B. insertion mutation.
C. Missense mutation,
D. nonsense mutation