Can ligands cross the cell membrane?

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?

Compare the two theories regarding the evolution of dinosaurs and then consider the cladogram above. although the two theories differ on the evolutionary path of dinosaurs, they agree that

What name is given to the process in which a strand of dna is used as a template for the manufacture of a strand of pre-mrna?