Last one this is science btw.

What filament and tubules give a cell its shape

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

Give one example of a pure (exact) number and of an estimated (measured) number.