27. Protists

Which of the following is one of the main weaknesses of the proposed classification scheme in which all eukaryotes are divided into four supergroups?

Which of the listed examples is a characteristic shared by diplomonads and parabasalids?

Apicomplexans are currently assigned to the SAR clade because __________.

Which of these groups includes photosynthetic unicellular organisms with flagella and contractile vacuoles?

How do trypanosomes withstand the attack of a host's immune system?

What do a carnivorous dinoflagellate, a parasitic apicomplexan, and a ciliate have in common?

Which organisms are capable of producing a "red tide"?

Which of these groups includes parasitic unicellular organisms with a complex of organelles specialized for penetrating host cells and tissues?

Which of these groups is characterized by cells that have more than one nucleus?

What is the purpose of the "floats" in some brown algae?

__________ is a protist that causes late blight of potatoes and was responsible for the Irish potato famine of the 19th century.

In lab class, a plasmodial slime mold is used as a demonstration organism. One of the students does not understand why this organism is not considered multicellular. How would you explain it to her?

Which of the following organisms is commercially harvested to extract algin from their cell walls?

Which of these groups includes unicellular organisms that, due to the structure of their cell walls, can withstand pressures equal to the pressure under each leg of a table supporting an elephant?

What role do diatoms play in the global carbon balance affecting global warming?