Problem 1: Distinguish between active and repressed chromatin.
Problem 2: What molecule is the immediate product of an active gene?
Problem 3: Define the following terms:
a. nucleosome
b. histone tail
Problem 4: What molecules place marks on histone tails to regulate gene expression?
Problem 5: Can the same chemical mark placed on the histone tail signal for two different events under different circumstances? If so, how?
Problem 6: Define the following terms:
a. acetylation
b. methylation
Problem 7: Are epigenetic changes reversible? For example, if a gene is turned off, can it be turned back on again? If so, explain how.