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MCAT Question A Day - 4/19/14

Chromosome puffs can be observed along giant polytene chromosomes in the salivary gland cells of insect larvae. They appear to be regions of DNA that uncoil or decondense. The locations of puffs change at different times during larval development in response to hormonal signals. This phenomenon is an example of

A.  gene regulation at the transcriptional level.
B.  a polygenic trait.
C.  posttranscriptional RNA processing.
D.  gene expression at the translational level.

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