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 _____________________.
举一反三
- Communication between cells is mediated by cell signaling molecules and ( ). A: Cell receptor B: Antibody C: Enzyme D: Electric signal
- The enzyme that catalyzes the condensation of acetyl-CoA with oxaloacetate is _______ _.
- Small molecules which are responsible for intracellular signal<br/>transduction are called( ) A: receptor B: vetor C: transmitter D: first messenger E: second<br/>messenger
- Which of the APC descriptions is incorrect? A: APC is anaphase-promoting complex. B: APC is a ubiquitin ligase E3. C: The activation of APC eventually leads to the release and activation of the separation enzyme, which in turn leads to the separation of sister chromatids. D: Activated cdc20 binds to APC and inhibits APC activity.
- The intracellular small molecules which can transmit extracellular signal is called ( ) A: first messenger B: carrier C: second messenger D: transmitter E: third messenger