The effort needed when a simple machine is used is best described by which of these statements?
a)
the effort force is always smaller than the force needed without the machine.
b)
the effort force is always greater than the force needed without the machine.
c)
the effort force is most often smaller than the force needed without the machine.
d)
the effort force is most often greater than the force needed without the machine.

One function of the poly-a tail on eukaryotic mrna sequences is to the mrna be transported from the nucleus to the cytoplasm. prokaryotic mrna also has a poly-a tail. choose the best explanation of the prokaryotic poly-a tail. a. prokaryotic poly-a tails are composed of a different molecular structure compared with eukaryotic poly-a tails. b. prokaryotic poly-a tails have the same functions as eukaryotic poly-a tails, because this process is highly conserved throughout different species. c. prokaryotic poly-a tails aren't important, because prokaryotes don't have nuclei. d. prokaryotic poly-a tails have other functions,because prokaryotes don't have nuclei.