שאלה | You have identified a DNA element (A -top left) that you think affects transcription. To test its character you add A to sequence 5' to a poorly transcribed (+) DNA sequence (B) and then transfer the recombinant back into a test cell type. The locations and orientations of the added sequence and its effect on transcription () are shown in the diagram. A is:

You have identified a DNA element (A -top left) that you think affects transcription. To test its character you add A to sequence 5' to a poorly transcribed (+) DNA sequence (B) and then transfer the recombinant back into a test cell type. The locations and orientations of the added sequence and its effect on transcription () are shown in the diagram. A is:

		1. An enhancer
		2. It is impossible to decide from the data.
		3. a core promoter element
		4. a promoter proximal element
		5. a promoter
		6. a transcription factor

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