题目内容

Transposons are mobile genetic elements that jump from chromosome to chromosome by（）

A. homologous recombination
B. non-homologous recombination
C. site specific recombination
D. mutation

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Which mutation will change a single codon so that one amino acid in a protein is replaced with a different amino acid（）

A. Silent mutations
B. Nonsense mutation
C. Missense mutation
D. Synonymous mutations

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In DNA repair, DNA glycosylases recognize deaminated__ within the DNA and remove them（）

A. nucleoside
B. nucleotide
C. thymine dimers
D. bases

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In the “Ac-Ds” system in maize, which of the following is correct about “Ds”（）

A. It is an autonomous controlling element
B. It is an activator
C. It does not contain terminal inverted repeats
D. It contains incomplete transposase gene

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Which of the following mutagen leads to frameshift mutation（）

A. Base analogs
B. Alkylating agents
C. Nitrite
D. Intercalating agents

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Transposons are mobile genetic elements that jump from chromosome to chromosome by（）

A. homologous recombination B. non-homologous recombination C. site specific recombination D. mutation

Which mutation will change a single codon so that one amino acid in a protein is replaced with a different amino acid（）

In DNA repair, DNA glycosylases recognize deaminated__ within the DNA and remove them（）

In the “Ac-Ds” system in maize, which of the following is correct about “Ds”（）

Which of the following mutagen leads to frameshift mutation（）

A. homologous recombination
B. non-homologous recombination
C. site specific recombination
D. mutation