The concentration of a biomolecule inside a rod-shaped prokaryotic cell is .0031 m. calculate the number of molecules inside the cell, which is 3.2 um long and 1.4 um in diameter.

Since the cell is rod shaped (cylindrical), the formula for volume is:

V = π r^2 h

V = π (0.7 um)^2 * 3.2 um

V = 4.926 um^3

So the number of moles is:

moles = 0.0031 mol / L * 4.926 um^3 * (1 x 10^-15 L / 1 um^3)

moles = 1.527 x 10^-17 mol

Using the avogadros number, we can calculate the number of molecules:

molecules = moles * Avogadros number

molecules = 1.527 x 10^-17 mol * 6.022 x 10^23 molecules / mol

molecules = 9,195,987.58 molecules

Taking the significant figures of 2:

molecules = 9.2 x 10^6 molecules

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

hope this   and an i get brainlsiest