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?

The most important primary producers in marine ecosystems are .

Which group is incorrectly paired with its description?a. diatoms—important producers in aquatic communitiesb. red algae—eukaryotes that acquired plastids by secondary endosymbiosisc. apicomplexans—unicellular parasites with intricate life cyclesd. diplomonads—unicellular eukaryotes with modified mitochondria

What is the role of PEP carboxylase in C4 and CAM plants?a. It fixes CO2 into an organic acid.b. It produces ATP for the Calvin cycle.c. It replaces rubicso in the Calvin cycle.d. It releases CO2 from organic acids.

According to the phylogeny presented in this chapter, which protists are in the same eukaryotic supergroup as plants?a. green algaeb. dinoflagellatesc. red algaed. both A and C