How can the activities of housefly affect humans in terms of transfer of types of diseases

Isotopes of the same element have differ in their

Facilitated diffusion move large molecules and/or polar molecules across the cell membrane. what does facilitated diffusion use to do this?

In the example of adrenaline signaling, which steps represent an amplification of the signal? question 1 choiceschoice a., activated receptor activates g proteins, g protein binding by gtp, cyclic amp activation of protein kinase achoice b., activated receptor activates g proteins, activated adenylyl cyclase produces camp, active protein kinase a phosphorylates target proteinschoice c., receptor signal binding, activated receptor activates g proteins, activated adenylyl cyclase producing campchoice d., receptor signal binding, activated adenylyl cyclase producing camp, active protein kinase a phosphorylating target proteins