Question

The listeria bacterium infects mammalian cells and moves through the cell by co-opting the fundamental mechanism of motion inside the cell -- the growth of chains of polymers of actin. One end of the actin chain attaches to the cytoskeleton and the other end to the bacterium. The end attached to the bacterium disconnects, adds an actin molecule to the chain, and reattaches, pushing the bacterium forward. For more about molecular motors, see the Youtube video from Ron Vale. After analyzing one video (like that on D2L), it is found that the listeria moves at a speed of (2.6x10^-6) meters/second. The size of an actin molecule is about 5.4 nm (i.e. 5.4 x 10^-9 m). Estimate the number of actins being added to the chain per second. Provide at least 2 significant figures in your answer in units of actin/second. So, if you calculate 346 actin/second, you'd enter "3.5 x 10^2"

Answer 1

Answer:

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