Question

Mutations in DNA are usually caused by chemical or radiation damage to DNA molecules, followed by imperfect repair of the damage. Immediately after this kind of imperfect repair, there may be a mismatched base pair in the DNA. The illustration above show and example of a mismatch, with the relevant pair bases in bold. Which of the following best represents the DNA of the two daughter cells produced when a bacterial cell with this particular mismatch replicates its DNA and divides?

Answer 1

The DNA of the two daughter cells created when a bacterial cell with this specific mismatch duplicates its DNA and splits is most accurately represented by the phrase "mutant in one but not the other."

Chemical damage (particles that can modify the structure of DNA or the base pair bonding) and radiation damage (UV radiation is known to create mutations known as thymine dimers) are two different ways that DNA can become genetically altered. Two thymine molecules on the same strand link together to cause these mutations, which change the structure of the DNA molecule. T=T can also be used to represent this.

Thus, we can state that the phrase "mutant in one but not the other" most appropriately describes the DNA of the two daughter cells produced when a bacterial cell with this particular mismatch copies its DNA and splits.

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