____ promotes the formation of covalent bonds between ____ thymine residues in a DNA strand creating a ____ ring called a thymidine dimer.

Question

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UV light promotes the formation of covalent bonds between adjacent thymine residues in a DNA strand, creating a cyclobutyl ring called a thymidine dimer. Visible light is not energetic enough to cause this reaction. Choice A is incorrect because visible light does not cause thymidine dimers with cyclohexyl rings. Choice D is incorrect because nearby thymine residues are not necessary for thymidine dimer formation. Choice E is incorrect because IR light does not promote the formation of thymidine dimers.

____ Promotes the Formation of Covalent Bonds Between ____ Thymine

Promotes the Formation of Covalent Bonds Between Thymine