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1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs

1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs

Human Anatomy & Physiology (11th Edition)
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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1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs 2. Bacterial growth. Under optimal conditions for growth, an E. coli cell will divide around every 20. minutes. For the following parts, assume an E. coli cell to be a cylinder 2.00 um long and 1.00 μm in diameter. If no cells died, how long would it take a single E. coli cell, under optimal conditions in a 500.-L reactor to reach its maximum cell density of 1.00 x 10¹0 cells/mL (a "saturated" culture)? Answer: t = 1043 min = 17.4 hours (17 hrs to 2 sig. figs.)
Transcribed Image Text:1. Natural selection is such a powerful force in evolution because cells with even a small proliferation advantage quickly outgrow their competitors. To illustrate this process, consider a cell culture that contains 1.00 million bacterial cells that double every 20. minutes. A single cell in this culture acquires a mutation that allows it to divide faster, with a generation time of only 15 minutes. Assuming that there is an unlimited food supply and no cell death, how long would it take before the progeny of the mutated cell became predominant in the culture? Answer: t = 20. hrs 2. Bacterial growth. Under optimal conditions for growth, an E. coli cell will divide around every 20. minutes. For the following parts, assume an E. coli cell to be a cylinder 2.00 um long and 1.00 μm in diameter. If no cells died, how long would it take a single E. coli cell, under optimal conditions in a 500.-L reactor to reach its maximum cell density of 1.00 x 10¹0 cells/mL (a "saturated" culture)? Answer: t = 1043 min = 17.4 hours (17 hrs to 2 sig. figs.)
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