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E.coli cell is a cylindar about 2 um long and 1 um in diameter. Its total...

E.coli cell is a cylindar about 2 um long and 1 um in diameter. Its total mass is about 1 pico gram, 70% of which is water and the half of the rest mass (dry mass) is protein (15%). Lipid molecule's dimension can be simplified as 0.5 nm x 0.5 nm x 1.0 nm. Ribosome is a molecular complex with total molecular mass of 2.5 x 106 Da. It is made of 1/3 of protein and 2/3 of RNA. In e.coli cells about 20% of total protein is ribosome protein. 1 Da = 1 gram/Mol.

1. How many lipid molecules are there in e.coli cell membrane?

2. What is the speed of a ribosome in thermal motion at physiolgoical temperature?

3. What is the average time for a ribosome to travel through the average distance between two neighboring ribosomes (given that all riboscomes distribute evenly in 1/3 of the cell volume)?

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Answer #1

1) The number cant be really predicted based on the dat but approximately its is more than 25000 molecules

2) The speed of a ribosome is 25um per second

3) The average time is 25 milliseconds

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