The frap technique occurs in a series of steps. select every statement that correctly describes a step in the frap procedure. choose one or more:

a. all fluorescent molecules in the cell are irreversibly bleached.

b. the molecule of interest is fluorescently labeled.

c. the relative mobility of the fluorescently labeled molecule is measured.

d. the speed of repair of the fluorescent marker is measured.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?