Some Bacteria Have a Higher Incidence Rate of Thymine Dimer

question 4

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 have a stronger expression of photoreactivation enzymes,leading to more thymine dimers being formed and retained.
• C)They may have a weaker expression of photoreactivation enzymes,leading to more thymine dimers being formed and retained.
• D)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 more thymine dimers being formed and retained.
• E)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 weaker expression of photoreactivation enzymes,leading to more thymine dimers being formed and retained.

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Definitions:

Cancer In Situ

A term used to describe cancer that is in its earliest stage, where it is confined to the site of origin without having spread to neighboring tissue.

In Situ

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Carcinoma

A type of cancer that begins in the skin or in tissues that line or cover internal organs.