21. DNA is methylated at

A. AC sequences
B. TATA sequences
C. CAAT sequences
D. CG sequences

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22. Why are several structural genes regulated as a unit in bacteria?

A. An accident of evolution
B. It allows coordinating regulation of genes with a common function
C. The bacteria chromosome is so small; many different genes must be controlled by the same promoter
D. none of the above

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23. Alternate splicing of RNA transcripts is a mechanism to regulate

A. tubulin
B. tachykinins
C. DNA methylation
D. leucine zippers

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