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

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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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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