19. The phase during which DNA is replicated is called(A)G1(B)S phase(C)prophase(D)telophase

22. Paracrine signaling(A)involves secreting cells acting on nearby target cells by discharging a local regulator into the extracellular fluid.(B)requires nerve cells to release a neurotransmitter into the synapse.(C)occurs only in paracrine yeast cells.(D)has been found in plants but not animals.(E)involves mating factors attaching to target cells and causing production of new paracrine cells.