#Question id: 15263
#Unit 2. Cellular Organization
#Question id: 20316
#Unit 7. System Physiology – Animal
#Question id: 1224
#Unit 4. Cell Communication and Cell Signaling
Put the steps of the process of signal transduction in the order they occur.
1. A conformational change in the signal-receptor complex activates an enzyme.
2. Protein kinases are activated.
3. A signal molecule binds to a receptor.
4. Target proteins are phosphorylated.
5. Second messenger molecules are released.
#Question id: 33448
#Unit 1. Molecules and their Interaction Relevant to Biology
#Question id: 27085
#Unit 1. Molecules and their Interaction Relevant to Biology
The number of phi and psi angles in an isolated amino acid (not in a polypeptide chain) is: