The function of a signal sequence found in a secreted eukaryotic protein is to be recognized by the which pauses translation by the ribosome until it is docked on the membrane where the nascent polypeptide can be translocated into the lumen of that compartment via a translocation channel.

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

Black becasue your dream isnt develpoped

What question are you asking here?