Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Lab 2 MicrosCO X
Copy of Lab 2 X
M Inbox (53,887) x b Answered: 4. 1 x C Search Textbo X +
/d/1lq1XGTjeDOK-AZLP5NCDYYPZT3K6_fPLnwx-GvHgLnU/edit#
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9.
Observing Bacteria in Colonies
In fresh or saltwater habitats, cyanobacteria will appear (without a microscope) as very
small green lines (as can be seen in this video). Observe the following images of
cyanobacteria colonies under 100x and 400x magnification with a light microscope:
Anabaena sp. 100x magnification
Anabaena sp. 400x magnification
As you can see, cyanobacteria grow as two different types of cells: those that are
photosynthetic (fixing carbon dioxide to make sugars), and heterocysts (that fix nitrogen to
make proteins and nucleic acids). Although these cells are genetically identical, each is
able to accomplish this via differences in gene expression, a key concept in biology you will
continue exploring this quarter. In the 400x magnification image, you should be able to
clearly see two different types of cells making up a colony of cyanobacteria.
A) Briefly describe the two different types of cells you can see in this image:
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Transcribed Image Text:Lab 2 MicrosCO X Copy of Lab 2 X M Inbox (53,887) x b Answered: 4. 1 x C Search Textbo X + /d/1lq1XGTjeDOK-AZLP5NCDYYPZT3K6_fPLnwx-GvHgLnU/edit# Normal text Arial 12 %00 L 1 2 3. 4. 5. 9. Observing Bacteria in Colonies In fresh or saltwater habitats, cyanobacteria will appear (without a microscope) as very small green lines (as can be seen in this video). Observe the following images of cyanobacteria colonies under 100x and 400x magnification with a light microscope: Anabaena sp. 100x magnification Anabaena sp. 400x magnification As you can see, cyanobacteria grow as two different types of cells: those that are photosynthetic (fixing carbon dioxide to make sugars), and heterocysts (that fix nitrogen to make proteins and nucleic acids). Although these cells are genetically identical, each is able to accomplish this via differences in gene expression, a key concept in biology you will continue exploring this quarter. In the 400x magnification image, you should be able to clearly see two different types of cells making up a colony of cyanobacteria. A) Briefly describe the two different types of cells you can see in this image:
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