The following steps occur in rods when they are excited by photons of light. what is the proper sequence for these steps? 1. membrane sodium channels close. 2. increased phosphodiesterase breaks down cgmp. 3. retinal changes from the 11-cis form to the 11-trans form. 4. the membrane hyperpolarizes and the rate of neurotransmitter release declines. 5. opsin activates transducin. 6. opsin activation occurs.

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.