When cpg islands are unmethylated,
a) chromatin in the promoter region is open, allowing access by transcription factors and rna polymerase
b) chromatin in the promoter region is closed, preventing transcription factors and rna polymerase from binding
c) chromatin in the enhancer region is closed, so they are unable to bind regulatory proteins to initiate transcription
d) dnase hypersensitivity in that region of the chromosome is lost
e) genes downstream of the cpg islands cannot be expressed, because the promoter region is blocked by histones

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

The response is the basis for vaccination. primary secondary tertiary none of the above

Where can dna be found in a prokaryotic cell