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
Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN:9781305073951
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Chapter1: Invitation To Biology
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Problem 5CT: In 2005, researcher Woo-suk Hwang reported that he had made immortal stem cells from human patients....
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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.)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F68cfc78d-9a17-4a18-9125-7ed4df6070d3%2F3810fe26-344f-4f73-b9d4-53de76c65521%2Fjktxst5_processed.png&w=3840&q=75)
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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