The working principle of riboswitch involves：
A: negative feedback
B: positive feedback
C: cis-repression
D: trans-activation
E: feedforward
A: negative feedback
B: positive feedback
C: cis-repression
D: trans-activation
E: feedforward
举一反三
- When the mean arterial pressure fluctuates in a certain range, the stabilization of the renal blood flow belongs to A: autoregualtion B: negative feedback C: positive feedback D: feedforward
- Calcium levels in the blood are regulated by A: positive feedback mechanism. B: negative feedback mechanism. C: neither positive or negative feedback. D: both positive and negative feedback.
- The delivery process belongs to () A: Neuro regulation B: Humoral regulation C: Autoregulation D: Positive feedback regulation E: Negative feedback regulation
- To get a current-voltage conversion circuit, () should be introduced in the amplifier circuit. A: current-series negative feedback B: current-shunt negative feedback C: voltage-series negative feedback D: voltage-shunt negative feedback
- Once<br/>labor begins in childbirth, contractions increase in intensity and<br/>frequency until delivery. The increasing labor contractions of<br/>childbirth are an example of ( ) A: A<br/>bioinformatic system B: Positive<br/>feedback C: Negative<br/>feedback D: Feedback<br/>inhibition E: Both<br/>C and D