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2 January, 02:46

Deamination of cytosine results in uracil. Assume a single deamination event occurs in the sequence below and is not repaired. Then, if two rounds of replication occur, which of the following DNA sequences will exist after two rounds of replication?

... TACT ...

... ATGA ...

Select one or more:

O ... TATT ... ATAA ...

O ... TAAT ... ATUA ...

O ... TAAT ... ATTA ...

O ... TAUT ... ATAA ...

O ... TACT ... ATGA ...

O ... UAGU ... AUCA ...

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Answers (1)
  1. 2 January, 05:20
    0
    Deoxyribonucleic acid (DNA) is hereditary molecule found almost in every cell. Although it is very stable molecule but changes known as mutations may occur in this molecules. Deamination is also a type of mutation.

    Deamination:

    In deamination amino group is removed from Cytosine and produces uracil in DNA. This rate of conversion occurs about 100 bases per cell per day.

    Sequence given in question is

    ... TACT ...

    ... ATGA ...

    After deamination the given sequence becomes

    ... TAUT ...

    ... ATAA ...
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