By measuring microtubule growth, you find that they grow at a rate of 3 μm/min (this number has been altered to make the following calculation easier). At this growth rate, approximately how many alpha/beta tubulin dimers (8 nm in length) are added to the ends of a microtubule each second (don't forget there are 13 protofilaments/microtubule)?

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? )

20 how are energy cycles and growth cycles related?

Which of these outcomes is a negative impact of postindustrial societies on the environment? a. nomadic ways b. overpopulation c. overgrazing d. resource renewal