Modified Mastering Biology With Pearson Etext -- Standalone Access Card -- For Biological Science (7th Edition)
7th Edition
ISBN: 9780135276556
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 27, Problem 12PIAT
Summary Introduction
To review:
The differences and comparison in the movement by the Dictyostelium in the migrating slug stage to the Physarum in the plasmodial stage.
Introduction:
Dictyostelium refers to the genus of the single and multicellular eukaryotic and phagotrophic bacterivores. These were traditionally known as slime molds and are found in the
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Why are red algae red? What distinguishes plasmodial and cellular slime molds? What are the ecological roles of protists? Why are photosynthetic protists so important to marine/aquatic ecosystems? What limits the growth of these organisms and what causes blooms? What will be affected if marine producers are disrupted?
In the pictures below, identify the arrowed reproductive structures of microscopic cyanobacteria based on the following descriptions:
Akinetes are dormant structures larger than the vegetative cells, are rich in food reserves, and have thick walls. Most filamentous cyanobacteria develop akinetes in adverse conditions (e.g., winter, dry periods). When favorable conditions return, they germinate and produce new filaments.
Hormogonia are short pieces of filaments consisting of 5–15 trichomes that fragment and develop into new filaments.
Heterocytes (or heterocysts) are multicellular structures that have a thick and massive sheath, formed by members of the Nostocales. It is the location of the enzyme nitrogenase for nitrogen fixation, the conversion of nitrogen gas into ammonium and then amino acids. They may be intercalary or terminal in position and may germinate from either end or both the ends to give rise to new filaments.
Non-filamentous cyanobacteria generally produce spores…
Which of the following is true about Heterocysts? Choose all possible answers.
Are the sites of nitrogen fixation in cyanobacteria
are surrounded by a thickened cell wall that slows the diffusion of O2 into the cell and
lack photosystem II
fluoresce as strongly as vegetative cells
are able to fix CO2
have intercellular connections with adjacent vegetative cells that allow for mutual
Chapter 27 Solutions
Modified Mastering Biology With Pearson Etext -- Standalone Access Card -- For Biological Science (7th Edition)
Ch. 27 - Why are protists considered paraphyletic? a. They...Ch. 27 - 2. The most important primary producers in marine...Ch. 27 - Prob. 5TYUCh. 27 - Prob. 6TYUCh. 27 - Prob. 7TYUCh. 27 - 8. The text claims that the evolutionary history...Ch. 27 - Prob. 9TYPSSCh. 27 - Prob. 10TYPSSCh. 27 - Does a slime mold “know” where it’s going?
When...Ch. 27 - Prob. 12PIAT
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