Compare DNA methylation to histone acetylation
What will be an ideal response?
ANSWER: DNA methylation and histone acetylation are two types of transcriptional regulation. Histone
acetylation is a highly reversible way of granting transcriptional machinery access to a
promoter. In histone acetylation, acetyl groups are added to specific amino acids in histone
tails to loosen the association of histones with the DNA. DNA methylation silences gene
expression by methylating cytosine bases in DNA; a process that is reversible. Both histone
acetylation and DNA methylation are epigenetic phenomena that can be preserved from one
generation to the next.
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If the surface area of a cell increases by a factor of 100, the volume of that cell will
A) remain the same. B) increase by a factor of 100. C) increase by a factor of 1000. D) increase by a factor of 10. E) decrease by a factor of 100.
RNAi is a key regulator of transcription
Indicate whether the statement is true or false.
Lost traps to collect shellfish have a large impact on
a. marine mammals. b. marine birds. c. marine turtles. d. lobster and crabs. e. plankton.
Which of the following animals lack a "true"
coelom?
a. flatworms only b. annelids only c. roundworms only d. flatworms and annelids e. flatworms and roundworms