Which of the Following is Correct Regarding Biological Toggle Switches

Question

Which of the following is correct regarding biological toggle switches?
A) They can be thought of as two back-to-back OR gates.
B) They can be described as straightforward "buffer gates."
C) They consist of a single NOT gate.
D) Two inducer signals are necessary to toggle the switch.
E) They have two repressor genes whose products can repress each other's transcription.

Accepted Answer

Biological toggle switches consist of two repressor genes whose products can repress each other's transcription, allowing for oscillations between two stable states. Choices A, B, and C do not accurately describe the mechanism of biological toggle switches. Choice D is only partially true, as two inducer signals can indeed toggle the switch, but it can also be toggled by the removal of one inducer signal.