Many Promoters of a Hypothetical Conserved Gene Have Mostly Adenines

question 90

Multiple Choice

Many promoters of a hypothetical conserved gene have mostly adenines and thymines. What is the MOST likely reason for this high proportion of adenines and thymines?

• A)RNA polymerases are better at incorporating uracils and thymines into RNA molecules than incorporating guanines and cytosines.
• B)This is the region for separating template and nontemplate strands, and A-T base pairs are easier to separate than G-C base pairs.
• C)Accessory proteins like sigma factors or transcription factors bind more easily to AT-rich sequences than they do to GC-rich sequences.
• D)It is possible to create more unique sequences for recognition with adenines and thymines than it is with guanines and cytosines.
• E)None of the other answer options is correct.

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