题目内容

Which of the following form of the English language is thought a free morpheme（）

A. The form non
B. The form un
C. The form nil
D. The form neg

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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

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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 form of the English language is thought a free morpheme（）

A. The form non B. The form un C. The form nil D. The form neg

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

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”（）

A. The form non
B. The form un
C. The form nil
D. The form neg