Some Bacteria Have a Higher Incidence Rate of Thymine Dimer

question 74

Multiple Choice

Some bacteria have a higher incidence rate of thymine dimer mutations following exposure to UV light than others. What might be going on here to lead to this outcome?

• A) They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed.
• B) They may simply have a higher proportion of T nucleotides next to each other in their DNA sequences than other bacteria, leading to more possible dimers being formed AND they may have a stronger expression of photoreactivation enzymes, leading to formation of more thymine dimers.
• C) They may simply have a higher proportion of T nucleotides next to each other in their DNA than other bacteria, leading to more possible dimers being formed AND they may have a weaker expression of photoreactivation enzymes, leading to formation of more thymine dimers.
• D) They may have a stronger expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained.
• E) They may have a weaker expression of photoreactivation enzymes, leading to more thymine dimers being formed and retained.

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