A fictional cubed-shaped bacterium, Bacterius cubis, occupies a volume of 2.8 femtoliters. This particular type of bacteria is known to communicate with its own species by secreting a small molecule called bactoX (MW=122.4 g/mol). A. Each bacterium contains 8850 bactoX molecules that can be secreted. How many moles of bactoX are present in a 1.2 μL sample volume that contains 3.234×102 bacterial cells? moles: _______ mol   B. Calculate the molarity (mol/L) of bactoX in the 1.2 μL sample volume if all of the bacteria were to simultaneously secrete all of the bactoX molecules contained within their cell bodies into the vial.   concentration: ________ M   C. Scientists discovered that bactoX will induce a luminescence response in B. cubis when the concentration in a sample reaches 7.00×10 -12 M. How many molecules of bactoX must be present in solution to initiate luminescence in a 1.8 μL sample? How many individual bacteria cells does this represent? The number of bactoX molecules per cell is given in part A.   molecules: _______ molecules   cells: ______ cells   D. What volume, in nanoliters, would the bacteria cells in part C occupy if tightly packed? Assume that there is no space between the cells.   volume: _____ nL

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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A fictional cubed-shaped bacterium, Bacterius cubis, occupies a volume of 2.8 femtoliters. This particular type of bacteria is known to communicate with its own species by secreting a small molecule called bactoX (MW=122.4 g/mol).

A. Each bacterium contains 8850 bactoX molecules that can be secreted. How many moles of bactoX are present in a 1.2 μL sample volume that contains 3.234×102 bacterial cells?

moles: _______ mol
 
B. Calculate the molarity (mol/L) of bactoX in the 1.2 μL sample volume if all of the bacteria were to simultaneously secrete all of the bactoX molecules contained within their cell bodies into the vial.
 
concentration: ________ M
 
C. Scientists discovered that bactoX will induce a luminescence response in B. cubis when the concentration in a sample reaches 7.00×10 -12 M. How many molecules of bactoX must be present in solution to initiate luminescence in a 1.8 μL sample? How many individual bacteria cells does this represent? The number of bactoX molecules per cell is given in part A.
 
molecules: _______ molecules
 
cells: ______ cells
 
D. What volume, in nanoliters, would the bacteria cells in part C occupy if tightly packed? Assume that there is no space between the cells.
 
volume: _____ nL
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