Red Algae: Ancient Eukaryotic Algae
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Questions and Answers

What is the primary habitat of red algae?

  • Freshwater
  • Cave environments
  • Marine (correct)
  • Terrestrial

Which class contains the majority of red algae species?

  • Chlorophyceae
  • Florideophyceae (correct)
  • Euglenophyceae
  • Cyanidiophyceae

What is the characteristic pigment that gives red algae their color?

  • Carotenoids
  • Phycobiliproteins (correct)
  • Chlorophyll
  • Anthocyanins

Why are red algae relatively rare in freshwater environments?

<p>Greater concentrations found in warmer areas (B)</p> Signup and view all the answers

What is a distinctive feature of red algae cells?

<p>Flagella and centrioles (B)</p> Signup and view all the answers

Why are there no terrestrial red algae species?

<p>Evolutionary bottleneck resulting in loss of core genes (B)</p> Signup and view all the answers

What type of starch do red algae store outside the chloroplasts?

<p>Floridean starch (C)</p> Signup and view all the answers

Which evolutionary event led to the origin of red and green algae?

<p>Primary endosymbiosis (A)</p> Signup and view all the answers

Where are the Cyanidiophyceae, a class of unicellular and thermoacidophilic extremophiles, found?

<p>Sulphuric hot springs and other acidic environments (A)</p> Signup and view all the answers

What did the secondary endosymbiosis event involving an ancestral red alga and a heterotrophic eukaryote result in?

<p>Evolution of several other photosynthetic lineages (A)</p> Signup and view all the answers

Which clade includes macroalgae, seaweed that usually do not grow to more than about 50 cm in length?

<p>BF clade (C)</p> Signup and view all the answers

What adaptation has made the survival of Cyanidiophyceae in sulphuric hot springs and other acidic environments possible?

<p>Horizontal gene transfers from prokaryotes (B)</p> Signup and view all the answers

Where are most rhodophytes (red algae) found?

<p>Marine environments with worldwide distribution (B)</p> Signup and view all the answers

What type of food product is made from red algae species Porphyra?

<p>All of the above (D)</p> Signup and view all the answers

What makes red algae different from green algae in terms of sugar storage?

<p>Red algae store floridean starch inside the chloroplasts. (C)</p> Signup and view all the answers

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