Which of the following statements about constitutive genes is false?
A) Constitutive genes account for less than 20 percent of a cell's genes.
B) Constitutive genes function differently than facultative genes.
C) Constitutive genes are expressed at any given time.
D) Constitutive genes produce their proteins when a cell encounters a specific environmental change.
E) Constitutive genes are referred to as housekeeping genes.
Answer: D
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