Explain the process of mitosis in a tissue culture for normal cells

Why is it important that human chromosomes have many origins of replication

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

What causes the phospholipids to organize themselves the way they do