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11. What are genes?

A. The functional unit of inheritance
B. A fragment of DNA
C. A portion of a chromosome
D. All of the above

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12. Which of the following is not a transcription factor?

A. Helix-turn-helix proteins
B. Zinc finger proteins
C. Leucine zipper proteins
D. Steroid hormones

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13. Sex determination in Drosophila involves

A. alternate splicing
B. methylation
C. gene amplification
D. none of these

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14. Enhancers differ from promoters in that

A. they initiate transcription
B. they are adjacent to the start codon
C. their orientation can be inverted without effect
D. they are restricted to a specific gene

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15. Methylated gene are

A. active
B. silent
C. dynamic
D. either (a) or (b)

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