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
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
Which of the following mutagen leads to frameshift mutation（）
A. Base analogs
B. Alkylating agents
C. Nitrite
D. Intercalating agents
In photo-reactivation, DNA damage caused by UV light is reversed by DNA photolyase which（）
A. is activated by UV light to form a complex
B. removes nicks in the DNA backbone
C. forms a complex with thymine dimers and the complex absorbs visible light which reverses the dimerization
D. binds to the adenine bases opposite the thymine dimer
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