Which of the following cell signaling molecules does the neurotransmitter belong to? ( )
A: Chemical signal
B: Gas molecules
C: Optical signal
D: Electric signal
A: Chemical signal
B: Gas molecules
C: Optical signal
D: Electric signal
举一反三
- Communication between cells is mediated by cell signaling molecules and ( ). A: Cell receptor B: Antibody C: Enzyme D: Electric signal
- How a cell reacts to a signal depends on the set of intracellular signaling molecules each cell-surface receptor produces and how these molecules alter the activity of effector proteins, which have a direct effect on the behavior of the target cell.
- In the OSNR model for EDFA amplifiers， SNR OUT = 1/（1/SNR IN + FhvB/P IN ）， what does SNR IN represent？（） A: the signal to noise of the current optical amplifier B: the signal to noise of the previous amplifier or source C: the signal to noise introduced by the optical multiplexer D: the accumulated noise to signal ratio of the optical channel
- Amplification results when an enzyme associated with a signal receptor is activated and, in turn, catalyzes the activation of many molecules of a second enzyme, each of which activates many molecules of a third enzyme, and so on, in a so-called _____________________.
- The intracellular small molecules which can transmit extracellular signal is called ( ) A: first messenger B: carrier C: second messenger D: transmitter E: third messenger