Housekeeping genes are vital to the function and maintenance of all the body's cells. What char-acteristic is associated with these genes?
a. They lack encoding histones.
b. They are transcriptionally active.
c. Ribosomal RNA genes are absent.
d. Epigenetic silencing has occurred.
ANS: B
A small percentage of genes, termed housekeeping genes, are necessary for the function and maintenance of all cells. These genes escape epigenetic silencing and remain transcriptionally ac-tive in all or nearly all cells. Housekeeping genes include encoding histones, DNA and RNA polymerases, and ribosomal RNA genes.
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