Ch. 16 Microbial Life: Prokaryotes and Protists

Taylor - Campbell Biology: Concepts & Connections 10th Edition

Taylor, Simon, Dickey, Hogan10th EditionCampbell Biology: Concepts & ConnectionsISBN: 9780136538783Not the one you use?Change textbook

Taylor, Simon, Dickey, Hogan 10th Edition

Ch. 16 Microbial Life: Prokaryotes and Protists

Problem 6

Chapter 16, Problem 6

Which of the following members of the SAR supergroup is incorrectly paired with its clade?
a. Stramenopiles—brown algae
b. Alveolates—parasites such as Plasmodium
c. Alveolates—dinoflagellates
d. Rhizaria—diatoms

Verified step by step guidance

Step 1: Understand the SAR supergroup. The SAR supergroup is a major group of protists that includes three main clades: Stramenopiles, Alveolates, and Rhizaria. Each clade contains specific organisms with unique characteristics.

Step 2: Review the characteristics of Stramenopiles. Stramenopiles include organisms such as brown algae, diatoms, and water molds. Brown algae are a well-known member of this clade.

Step 3: Examine the Alveolates clade. Alveolates include organisms such as dinoflagellates, ciliates, and apicomplexans (e.g., Plasmodium, which causes malaria). Both dinoflagellates and Plasmodium are correctly associated with this clade.

Step 4: Investigate the Rhizaria clade. Rhizaria includes organisms such as foraminiferans, radiolarians, and cercozoans. Diatoms, however, are not part of this clade; they belong to the Stramenopiles.

Step 5: Identify the incorrect pairing. Based on the analysis, the incorrect pairing is 'Rhizaria—diatoms,' as diatoms are part of the Stramenopiles, not Rhizaria.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

SAR Supergroup

The SAR supergroup is a major clade in the eukaryotic domain that includes three diverse groups: Stramenopiles, Alveolates, and Rhizaria. This classification is based on genetic and morphological data, highlighting the evolutionary relationships among these organisms. Understanding the SAR supergroup is essential for identifying the characteristics and ecological roles of its members.

Stramenopiles

Stramenopiles are a group of protists characterized by their unique flagella, which have hair-like projections. This group includes important organisms such as brown algae, diatoms, and water molds. Recognizing the members of this clade helps in understanding their ecological significance, particularly in aquatic environments.

Alveolates

Alveolates are a clade of protists defined by the presence of alveoli, which are membrane-bound sacs located just beneath the plasma membrane. This group includes dinoflagellates, ciliates, and apicomplexans, such as Plasmodium, the causative agent of malaria. Familiarity with alveolates is crucial for understanding their diverse life cycles and ecological roles, including their impact on human health.

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Stramenopila and Alveolata

Related Practice

Textbook Question

In terms of nutrition, autotrophs are to heterotrophs as

a. Kelp are to diatoms.

b. Archaea are to bacteria.

c. Slime molds are to algae.

d. Algae are to slime molds.

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Textbook Question

A new organism has been discovered. Tests have revealed that it is unicellular, is autotrophic, and has a cell wall that contains peptidoglycan. Based on this evidence, it should be classified as a(n)

a. Alga.

b. Archaean.

c. Protist.

d. Bacterium.

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Textbook Question

Which pair of protists has support structures composed of silica?

a. Dinoflagellates and diatoms

b. Diatoms and radiolarians

c. Radiolarians and forams

d. Forams and amoebozoans