Microbiology Fundamentals: A Clinical Approach
Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
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Chapter 3, Problem 12Q

Bacterial and archaeal chromosomes are not enclosed in a membrane-bound nucleus. You will learn about some advantages of this arrangement in another chapter, but can you think of some disadvantages?

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A typical human hepatocyte (liver cell), a widely studied eukaryotic cell, has a diameter of about 20 μm. Calculate the volume of both a prokaryotic and a eukaryotic cell. To appreciate the magnitude of the size difference between the two cell types, estimate how many bacterial cells would fit inside the liver cell. (Hint: Use the expression V = πr 2h for the volume of a cylinder and V = (4/3)π r 3 .
Why do eukaryotic cells require a nucleus as a separate compartment when prokaryotic cells can manage perfectly well without?
You treat a cell with a fluorescently-labelled antibody that recognizes microtubules, and you observe what appears to be a spindle apparatus. Is the cell a prokaryote or a eukaryote? Explain.     Some archaebacteria species live in extremely high-salt environments. Cite a specific example of protein modification that has allowed these bacteria to accomplish this.

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Microbiology Fundamentals: A Clinical Approach

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