Which of the following is not a general mechanism that cells use to maintain stable patterns of gene expression as cells divide?
(a) a positive feedback loop, mediated by a transcriptional regulator that
activates transcription of its own gene in addition to other cell-type
specific genes
(b) faithful propagation of condensed chromatin structures as cells divide
(c) inheritance of DNA methylation patterns when cells divide
(d) proper segregation of housekeeping proteins when cells divide