The most important primary producers in marine ecosystems are .

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

Which of the following groups of algae is/are most closely related to land plants?

On some areas of the seafloor, one could observe an "ooze" that is hundreds of meters thick. What creates this ooze?

Many species of red algae are adapted to deeper water due to the fact that __________.

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

How can dinoflagellates be harmful to humans?a. They are transmitted by mosquitoes and cause malaria.b. They produce toxins that can be absorbed by clams and other shellfish which, when eaten by people, can lead to paralytic shellfish poisoning.c. They cause amoebic dysentery which leads to severe diarrhea and dehydration.d. They are transmitted by tsetse flies and cause 'sleeping sickness.'