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Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni
Edition 9ISBN: 9780134295510Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni
Edition 9ISBN: 9780134295510 Exercise 7
Nonstandard Purines and Pyrimidines. Shown in Figure are three nonstandard nitrogenous bases that are formed by the deamination of naturally occurring bases in DNA.
(a)Indicate which base in DNA must be deaminated to form each of these bases.
(b)Why are there only three bases shown, when DNA contains four bases
(c)Why is it important that none of the bases shown in Figure a occurs naturally in DNA
(d)Figure b shows 5-methylcytosine, a pyrimidine that arises naturally in DNA when cellular enzymes methylate cytosine. Why is the presence of this base likely to increase the probability of a mutation
FIGURE 19-46 Structures of Several Nonstandard Purines and Pyrimidines.
(a)Indicate which base in DNA must be deaminated to form each of these bases.
(b)Why are there only three bases shown, when DNA contains four bases
(c)Why is it important that none of the bases shown in Figure a occurs naturally in DNA
(d)Figure b shows 5-methylcytosine, a pyrimidine that arises naturally in DNA when cellular enzymes methylate cytosine. Why is the presence of this base likely to increase the probability of a mutation
FIGURE 19-46 Structures of Several Nonstandard Purines and Pyrimidines.
Explanation
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(a)
Deamination is a type of DNA damage ...
Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni
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